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1. general description the pcu9955 is an ultra-fast mode (ufm) i 2 c-bus controlled 16-channel constant current led driver optimized for dimming and blinking 57 ma red/green/blue/amber (rgba) leds in amusement products. each ledn output has its own 8-bit resolution (256 steps) fixed frequency individual pwm controller that operates at 31.25 khz with a duty cycle that is adjustable from 0 % to 99 .6 % to allow the led to be set to a specific brightness value. an additional 8-bit resoluti on (256 steps) group pwm controller has both a fixed frequency of 122 hz and an adjustable frequency between 15 hz to once every 16.8 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all leds with the same value. each ledn output can be off, on (no pwm co ntrol), set at its individual pwm controller value or at both individual and group pwm controller values. the pcu9955 operates with a supply voltage range of 3 v to 5.5 v and the constant current sink ledn outputs allow up to 40 v for the led supply. the output current is adjustable with an 8-bit linear dac from 225 ? a to 57 ma. this device has built-in open, short load an d overtemperature detection circuitry. the thermal shutdown feature protects the device when internal junction temperature exceeds the limit allowed for the process. the pcu9955 device is the first led controller device in a new ultra fast-mode (ufm) i 2 c-bus family. ufm i 2 c-bus devices offer higher frequency (up to 5 mhz). the ufm i 2 c-bus slave devices operate in re ceive-only mode. that is, only i 2 c writes to pcu9955 are supported. as such, there are no status registers in pcu9955. the pcu9955 allows significantly higher data transfer rate compared to the fast-mode plus versions (pca9952/55). software programmable led group and three sub call i 2 c-bus addresses allow all or defined groups of pcu9955 devices to respond to a common i 2 c-bus address, allowing for example, all red leds to be turned on or off at the same time, thus minimizing i 2 c-bus commands. on power-up, pcu9955 will have a uni que sub call address to identify it as a 16-channel led driver. this allows mixing of devices with different channel widths. four hardware address pins on pcu9955 allow up to 16 devices on the same bus. the software reset (swrst) function allows the master to perform a reset of the pcu9955 through the i 2 c-bus, identical to th e power-on reset (por) that initializes the registers to their default stat e causing the output current switches to be off (led off). this allows an easy and quick way to reco nfigure all device registers to the same condition. pcu9955 16-channel ufm i 2 c-bus 57 ma consta nt current led driver rev. 2 ? 2 october 2012 product data sheet
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 2 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 2. features and benefits ? 16 led drivers. each output programmable at: ? off ? on ? programmable led brightness ? programmable group dimming/blinking mi xed with individual led brightness ? programmable ledn output enable delay to reduce emi and surge currents ? 16 constant current output channels can sink up to 57 ma, tolerate up to 40 v when off ? output current adjusted through an external resistor ? output current accuracy ? 6 % between output channels ? 8 % between pcu9955 devices ? thermal shutdown for overtemperature ? 5 mhz ultra fast-mode compatible i 2 c-bus interface ? 256-step (8-bit) linear programmable brightness per ledn output varying from fully off (default) to maximum brightness using a 31.25 khz pwm signal ? 256-step group brightness control allows general dimming (using a 122 hz pwm signal) from fully off to maximum brightness (default) ? 256-step group blinking programmable from 15 hz to 16.8 s and duty cycle from 0 % to 99.6 % ? output state change programmable on the ack nowledge (bit 9, this bit is always set to 1 by i 2 c-bus master) or the stop command to update outputs byte-by-byte or all at the same time (default to ?change on stop?). ? 4 hardware address pins allow 16 pcu9955 devices to be connected to the same i 2 c-bus and to be individually programmed ? 4 software programmable i 2 c-bus addresses (one led group call address and three led sub call addresses) allow groups of devic es to be addressed at the same time in any combination (for example, one register used for ?all ca ll? so that all the pcu9955s on the i 2 c-bus can be addressed at the same time and the second register used for three different addresses so that 1 3 of all devices on the bus can be addressed at the same time in a group). software enable and disable for each programmable i 2 c-bus address. ? unique power-up default sub call address a llows mixing of devices with different channel widths ? software reset feature (s wrst call) allows the devic e to be reset through the i 2 c-bus ? 8 mhz internal oscillator requ ires no external components ? internal power-on reset ? noise filter on usda/uscl inputs ? no glitch on ledn outputs on power-up ? low standby current ? operating power supply voltage (v dd ) range of 3 v to 5.5 v ? 5.5 v tolerant inputs on non-led pins ? 40 q c to +85 q c operation
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 3 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver ? esd protection exceeds 2000 v hbm per jesd22-a114 and 750 v cdm per jesd22-c101 ? latch-up testing is done to jedec standard jesd78 class ii, level b ? package offered: htssop28 3. applications ? amusement products ? rgb or rgba led drivers ? led status information ? led displays ? lcd backlights ? keypad backlights for cellular phones or handheld devices 4. ordering information table 1. ordering information type number topside mark package name description version PCU9955TW pcu9955 htssop28 plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 4 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 5. block diagram dim repetition rate = 122 hz. blink repetition rate = 15 hz to every 16.8 seconds. fig 1. block diagram of pcu9955 a0 a1 a2 a3 002aaf093 ufm i 2 c-bus control input filter pcu9955 power-on reset uscl usda v dd v ss led state select register pwm register x brightness control grpfreq register grppwm register mux/ control '0' ? permanently off '1' ? permanently on reset rext led14 led15 i/o regulator output driver, delay control and thermal shutdown input filter 200 k individual led current setting 8-bit dacs dac 15 led1 led0 dac 14 dac1 dac0 grpfreq register dim clock 31.25 khz 8 mhz oscillator 256 repetition rate 31.25 khz
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 5 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 6. pinning information 6.1 pinning 6.2 pin description (1) thermal pad; connected to v ss . fig 2. pin configuration for htssop28 002aaf094 1 2 3 4 5 6 7 8 9 10 20 19 11 12 18 17 22 21 13 14 16 15 24 23 26 25 28 27 PCU9955TW rext v dd a0 usda a1 uscl a2 reset a3 v ss led0 led15 led1 led14 led2 led13 led3 led12 v ss v ss led4 led11 led5 led10 led6 led9 led7 led8 (1) table 2. pin description symbol pin type description rext 1 i current set resistor input; resistor to ground a0 2 i address input 0 [1] a1 3 i address input 1 [1] a2 4 i address input 2 [1] a3 5 i address input 3 [1] led0 6 o led driver 0 led1 7 o led driver 1 led2 8 o led driver 2 led3 9 o led driver 3 led4 11 o led driver 4 led5 12 o led driver 5 led6 13 o led driver 6 led7 14 o led driver 7 led8 15 o led driver 8 led9 16 o led driver 9 led10 17 o led driver 10 led11 18 o led driver 11 led12 20 o led driver 12
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 6 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver [1] in order to obtain the best system level esd performance, a standard pull-up resistor (10 k ? typical) is required for any address pin connecting to v dd . for additional information on system level esd performance, please refer to appl ication notes an10897 and an11131. [2] htssop28 package supply ground is connected to both v ss pins and exposed center pad. v ss pins must be connected to supply ground for pr oper device operation. for enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the pcb in the thermal pad region. 7. functional description refer to figure 1 ? block diagram of pcu9955 ? . 7.1 device addresses following a start condition, the bus master must output the address of the slave it is accessing. for pcu9955 there are a maximum of 16 possible programmable addresses using the 4 hardware address pins. 7.1.1 regular i 2 c-bus slave address the i 2 c-bus slave address of the pcu9955 is shown in figure 3 . to conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled high or low externally. remark: reserved i 2 c-bus addresses must be used with caution since they can interfere with: ? ?reserved for future use? i 2 c-bus addresses (0000 011, 1111 1xx) ? slave devices that use the 10-bit addressing scheme (1111 0xx) ? slave devices that are designed to resp ond to the general call address (0000 000) ? high-speed mode (hs-mode) master code (0000 1xx) led13 21 o led driver 13 led14 22 o led driver 14 led15 23 o led driver 15 reset 25 i active low reset input uscl 26 i ufm serial clock line usda 27 i ufm serial data line v ss 10, 19, 24 [2] ground supply ground v dd 28 power supply supply voltage table 2. pin description ?continued symbol pin type description
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 7 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver the last bit of the address byte defines the operation to be performed. only writes to pcu9955 are supported, therefore the last bit is set to 0. 7.1.2 led all call i 2 c-bus address ? default power-up value (allcalladr register): e0h or 1110 000x ? programmable through i 2 c-bus (volatile programming) ? at power-up, led all call i 2 c-bus address is enabled. see section 7.3.10 ? allcalladr, led all call i 2 c-bus address ? for more detail. remark: the default led all call i 2 c-bus address (e0h or 1110 000x) must not be used as a regular i 2 c-bus slave address since this addre ss is enabled at power-up. all of the pcu9955s on the ufm i 2 c-bus will respond to the address if sent by the i 2 c-bus master. 7.1.3 led bit sub call i 2 c-bus addresses ? 3 different i 2 c-bus addresses can be used ? default power-up values: ? subadr1 register: ech or 1110 110x ? subadr2 register: ech or 1110 110x ? subadr3 register: ech or 1110 110x ? programmable through ufm i 2 c-bus (volatile programming) ? at power-up, subadr1 is enabled while subadr2 and subadr3 i 2 c-bus addresses are disabled. remark: at power-up subadr1 identifies this device as a 16-channel driver. see section 7.3.9 ? led bit sub call i 2 c-bus addresses for pcu9955 ? for more detail. 7.2 control register following the slave address, led all call address or led sub call address, the bus master will send a byte to the pcu9955, wh ich will be stored in the control register. the lowest 7 bits are used as a pointer to determine which re gister will be accessed (d[6:0]). the highest bit is used as auto-increme nt flag (aif). the aif is active by default at power-up. this bit along with the mode1 register bit 5 and bit 6 provide the auto-increment feature. fig 3. pcu9955 slave address 002aaf095 1 1 0 a3 a2 a1 a0 0 fixed hardware selectable slave address w (write only)
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 8 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver when the auto-increment flag is set (aif = logic 1), the seven low order bits of the control register are automatically increment ed after a write. this allows the user to program the registers sequentially. four differ ent types of auto-increment are possible, depending on ai1 and ai0 values of mode1 register. [1] ai1 and ai0 come from mode1 register. remark: other combinations not shown in ta b l e 3 (aif + ai[1:0] = 001b, 010b and 011b) are reserved and must not be used for proper device operation. aif + ai[1:0] = 000b is used when the same register must be accessed several times during a single i 2 c-bus communication, for example, changes the brightness of a single led. data is overwritten each time the register is accessed during a write operation. aif + ai[1:0] = 100b is used when registers 00h to 41h must be sequentially accessed, for example, power-up programming. aif + ai[1:0] = 101b is used when the 16 led drivers must be individually programmed with different values during the same i 2 c-bus communication, for example, changing color setting to another color setting. aif + ai[1:0] = 110b is used when mode1 to ir ef15 registers must be programmed with different settings during the same i 2 c-bus communication. aif + ai[1:0] = 111b is used when the 16 led drivers must be individually programmed with different values in addition to global programming. only the 7 least significant bits d[6:0] ar e affected by the aif, ai1 and ai0 bits. reset state = 80h remark: the control register does not apply to the software reset i 2 c-bus address. fig 4. control register table 3. auto-increment options aif ai1 [1] ai0 [1] function 0 0 0 no auto-increment 1 0 0 auto-increment for registers (00h to 41h) . d[6:0] roll over to 00h after the last register 41h is accessed. 1 0 1 auto-increment for individual brig htness registers only (0ah to 19h). d[6:0] roll over to 0ah after the last register (19h) is accessed. 1 1 0 auto-increment for mode1 to iref 15 control registers (00h to 31h). d[6:0] roll over to 00h after the last register (31h) is accessed. 1 1 1 auto-increment for global control regi sters and individual brightness registers (08h to 19h). d[6:0] roll over to 08h after the last register (19h) is accessed. 002aad850 aif d6 d5 d4 d3 d2 d1 d0 auto-increment flag register address
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 9 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver when the control register is written, the regi ster entry point determined by d[6:0] is the first register that will be addressed and can be anywhere betw een 00h and 41h (as defined in table 4 ). when aif = 1, the auto-increment flag is set and the rollover value at which the register increment stops and goes to the next one is determined by aif, ai1 and ai0. see table 3 for rollover values. for example, if mode1 register bit ai1 = 0 and ai0 = 1 and if the control regi ster = 1001 0000, th en the register ad dressing sequence will be (in hexadecimal): 10 ? 11 ? ? ? 19 ? 0a ? 0b ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending data. if mode1 register bit ai1 = 0 and ai0 = 0 and if the control register = 1010 0010, then the register addressing sequen ce will be (in hexadecimal): 22 ? 23 ? ? ? 41 ? 00 ? 01 ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending data. if mode1 register bit ai1 = 0 and ai0 = 1 and if the control register = 1000 0101, then the register addressing sequen ce will be (in hexadecimal): 05 ? 06 ? ? ? 19 ? 0a ? 0b ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending data. remark: writing to registers marked ?not used? will be ignored. 7.3 register definitions table 4. register summary register number (hexadecimal) d6 d5 d4 d3 d2 d1 d0 name type function 00h 0000000mode1 write only mode register 1 01h 0000001mode2 write only mode register 2 02h 0000010ledout0 write only ledn output state 0 03h 0000011ledout1 write only ledn output state 1 04h 0000100ledout2 write only ledn output state 2 05h 0000101ledout3 write only ledn output state 3 06h 0000110- write only not used [1] 07h 0000111- write only not used [1] 08h 0001000grppwm write only group duty cycle control 09h 0001001grpfreq write only group frequency 0ah 0001010pwm0 write only brightness control led0 0bh 0001011pwm1 write only brightness control led1 0ch 0001100pwm2 write only brightness control led2 0dh 0001101pwm3 write only brightness control led3 0eh 0001110pwm4 write only brightness control led4 0fh 0001111pwm5 write only brightness control led5 10h 0010000pwm6 write only brightness control led6 11h 0010001pwm7 write only brightness control led7 12h 0010010pwm8 write only brightness control led8 13h 0010011pwm9 write only brightness control led9 14h 0010100pwm10 write only brightness control led10
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 10 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver [1] remark: writing to registers marked ?not used? will be ignored. [2] remark: writing to registers marked ?reserved? wi ll not change any functionality in the chip. 15h 0010101pwm11 write only brightness control led11 16h 0010110pwm12 write only brightness control led12 17h 0010111pwm13 write only brightness control led13 18h 0011000pwm14 write only brightness control led14 19h 0011001pwm15 write only brightness control led15 1ah to 21h -------- write only not used [1] 22h 0100010iref0 write only output gain control register0 23h 0100011iref1 write only output gain control register1 24h 0100100iref2 write only output gain control register2 25h 0100101iref3 write only output gain control register3 26h 0100110iref4 write only output gain control register4 27h 0100111iref5 write only output gain control register5 28h 0101000iref6 write only output gain control register6 29h 0101001iref7 write only output gain control register7 2ah 0101010iref8 write only output gain control register8 2bh 0101011iref9 write only output gain control register9 2ch 0101100iref10 write only output gain control register10 2dh 0101101iref11 write only output gain control register11 2eh 0101110iref12 write only output gain control register12 2fh 0101111iref13 write only output gain control register13 30h 0110000iref14 write only output gain control register14 31h 0110001iref15 write only output gain control register15 32h to 39h -------- write only not used [1] 3ah 0111010offset write only offset/delay on ledn outputs 3bh 0111011subadr1 write only i 2 c-bus subaddress 1 3ch 0111100subadr2 write only i 2 c-bus subaddress 2 3dh 0111101subadr3 write only i 2 c-bus subaddress 3 3eh 0111110allcalladrwrite only all call i 2 c-bus address 3fh 0111111r eserved1 write only reserved [2] 40h -------- write only not used [1] 41h -------- write only not used [1] 42h 1000010pwmall write only brightness control for all ledn 43h 1000011irefall write only output gain control for all registers iref0 to iref15 44h to 7fh -------- write only not used [1] table 4. register summary ?continued register number (hexadecimal) d6 d5 d4 d3 d2 d1 d0 name type function
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 11 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.3.1 mode1 ? mode register 1 [1] it takes 500 ? s max. for the oscillator to be up and running once sleep bit has been set to logic 0. timings on ledn outputs are not guaranteed if pwmx, grppwm or grpfreq registers are accessed within the 500 ? s window. [2] no blinking or dimming is possib le when the oscillator is off. 7.3.2 mode2 ? mode register 2 table 5. mode1 - mode register 1 (address 00h) bit description legend: * default value. bit symbol access value description 7 aif - - not used 6 ai1 w only 0* auto-increment bit 1 = 0 . auto-increment range as defined in table 3 . 1 auto-increment bit 1 = 1. auto-increment range as defined in table 3 . 5 ai0 w only 0* auto-increment bit 0 = 0 . auto-increment range as defined in table 3 . 1 auto-increment bit 0 = 1. auto-increment range as defined in table 3 . 4 sleep w only 0* normal mode [1] . 1 low power mode. oscillator off [2] . 3 sub1 w only 0 pcu9955 does not respond to i 2 c-bus subaddress 1. 1* pcu9955 responds to i 2 c-bus subaddress 1. 2 sub2 w only 0* pcu9955 does not respond to i 2 c-bus subaddress 2. 1 pcu9955 responds to i 2 c-bus subaddress 2. 1 sub3 w only 0* pcu9955 does not respond to i 2 c-bus subaddress 3. 1 pcu9955 responds to i 2 c-bus subaddress 3. 0 allcall w only 0 pcu9955 does not respond to led all call i 2 c-bus address. 1* pcu9955 responds to led all call i 2 c-bus address. table 6. mode2 - mode register 2 (address 01h) bit description legend: * default value. bit symbol access value description 7 - - - not used 6 - - - not used 5 dmblnk w only 0* group control = dimming. 1 group control = blinking. 4 - - 0* reserved 3 och w only 0* outputs change on stop command [1] 1 outputs change on ack, this 9th bit is always set to 1 by ufm i 2 c-bus master 2 - - 1* reserved 1 - - 0* reserved 0 - - 1* reserved
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 12 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver [1] change of the outputs at the stop command allows synchronizing outputs of more than one pcu9955. applicable to registers from 02h (ledout0) to 3ah (offset) only. 7.3.3 ledout0 to ledout3, led driver output state ldrx = 00 ? led driver x is off (default power-up state, x = 0 to 15). ldrx = 01 ? led driver x is fully on (individual brightness and group dimming/blinking not controlled). ldrx = 10 ? led driver x individual brightness can be controlled through its pwmx register. ldrx = 11 ? led driver x individual brightness and group dimming/blinking can be controlled through its pwmx register and the grppwm registers. 7.3.4 grppwm, group duty cycle control when dmblnk bit (mode2 register) is programmed with logic 0, a 122 hz fixed frequency signal is superimposed with the 31. 25 khz individual brightness control signal. grppwm is then used as a global brightness control allowing the ledn outputs to be dimmed with the same value. the value in grpfreq is then a ?don?t care?. table 7. ledout0 to ledout3 - led driver ou tput state registers (address 02h to 05h) bit description legend: * default value. address register bit symbol access value description 02h ledout0 7:6 ldr3 w only 00* led3 output state control 5:4 ldr2 w only 00* led2 output state control 3:2 ldr1 w only 00* led1 output state control 1:0 ldr0 w only 00* led0 output state control 03h ledout1 7:6 ldr7 w only 00* led7 output state control 5:4 ldr6 w only 00* led6 output state control 3:2 ldr5 w only 00* led5 output state control 1:0 ldr4 w only 00* led4 output state control 04h ledout2 7:6 ldr11 w only 00* le d11 output state control 5:4 ldr10 w only 00* led10 output state control 3:2 ldr9 w only 00* led9 output state control 1:0 ldr8 w only 00* led8 output state control 05h ledout3 7:6 ldr15 w only 00* le d15 output state control 5:4 ldr14 w only 00* led14 output state control 3:2 ldr13 w only 00* led13 output state control 1:0 ldr12 w only 00* led12 output state control table 8. grppwm - group brightness control register (address 08h) bit description legend: * default value address register bit symbol access value description 08h grppwm 7:0 gdc[7:0] w only 1111 1111* grppwm register
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 13 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver general brightness for the 16 outputs is co ntrolled through 256 linear steps from 00h (0 % duty cycle = ledn output off) to ffh (9 9.6 % duty cycle = maximum brightness). applicable to ledn outputs programmed with ldrx = 11 (ledout0 to ledout3 registers). when dmblnk bit is programmed with logic 1, grppwm and grpfreq registers define a global blinking pattern, where grpfreq contains the blinking period (from 15 hz to 16.8 s) and grppwm the duty cycle (on/off ratio in %). (1) 7.3.5 grpfreq, group frequency grpfreq is used to program the global blinking period when dmblnk bit (mode2 register) is equal to 1. value in this re gister is a ?don?t care? when dmblnk = 0. applicable to ledn outputs programmed with ldrx = 11 (ledout0 to ledout3 registers). blinking period is controlled through 256 linear steps from 00h (67 ms, frequency 15 hz) to ffh (16.8 s). (2) 7.3.6 pwm0 to pwm15, individual brightness control duty cycle gdc 7 : 0 ?? 256 -------------------------- = table 9. grpfreq - group frequency register (address 09h) bit description legend: * default value. address register bit symbol access value description 09h grpfreq 7:0 gfrq[7:0] w only 0000 0000* grpfreq register global blinking period gfrq 7 : 0 ?? 1 + 15.26 --------------------------------------- - s ?? = table 10. pwm0 to pwm15 - pwm registers 0 to 15 (address 0ah to 19h) bit description legend: * default value. address register bit symbol access value description 0ah pwm0 7:0 idc0[7:0] w only 0000 0000* pwm0 individual duty cycle 0bh pwm1 7:0 idc1[7:0] w only 0000 0000* pwm1 individual duty cycle 0ch pwm2 7:0 idc2[7:0] w only 0000 0000* pwm2 individual duty cycle 0dh pwm3 7:0 idc3[7:0] w only 0000 0000* pwm3 individual duty cycle 0eh pwm4 7:0 idc4[7:0] w only 0000 0000* pwm4 individual duty cycle 0fh pwm5 7:0 idc5[7:0] w only 0000 0000* pwm5 individual duty cycle 10h pwm6 7:0 idc6[7:0] w only 0000 0000* pwm6 individual duty cycle 11h pwm7 7:0 idc7[7:0] w only 0000 0000* pwm7 individual duty cycle 12h pwm8 7:0 idc8[7:0] w only 0000 0000* pwm8 individual duty cycle 13h pwm9 7:0 idc9[7:0] w only 0000 0000* pwm9 individual duty cycle 14h pwm10 7:0 idc10[7:0] w only 0000 0000* pwm10 individual duty cycle 15h pwm11 7:0 idc11[7:0] w only 0000 0000* pwm11 individual duty cycle 16h pwm12 7:0 idc12[7:0] w only 0000 0000* pwm12 individual duty cycle
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 14 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver a 31.25 khz fixed frequency signal is used fo r each output. duty cycle is controlled through 256 linear steps from 00h (0 % duty cycle = ledn output off) to ffh (99.6 % duty cycle = ledn output at maximum br ightness). applicable to ledn outputs programmed with ldrx = 10 or 11 (ledout0 to ledout3 registers). (3) remark: the first lower end 8 steps of pwm and the last (higher end) steps of pwm will not have effective brightness control of leds due to edge rate control of ledn output pins. 7.3.7 iref0 to iref15, ledn output current value registers these registers reflect the gain settings for output current for led0 to led15. 17h pwm13 7:0 idc13[7:0] w only 0000 0000* pwm13 individual duty cycle 18h pwm14 7:0 idc14[7:0] w only 0000 0000* pwm14 individual duty cycle 19h pwm15 7:0 idc15[7:0] w only 0000 0000* pwm15 individual duty cycle table 10. pwm0 to pwm15 - pwm registers 0 to 15 (address 0ah to 19h) bit description ?continued address register bit symbol access value description duty cycle idcx 7 : 0 ?? 256 --------------------------- = table 11. iref0 to iref15 - ledn output gain control registers (address 22h to 31h) bit description legend: * default value. address register bit access value description 22h iref0 7:0 w only 00h* led 0 output current setting 23h iref1 7:0 w only 00h* led 1 output current setting 24h iref2 7:0 w only 00h* led 2 output current setting 25h iref3 7:0 w only 00h* led 3 output current setting 26h iref4 7:0 w only 00h* led 4 output current setting 27h iref5 7:0 w only 00h* led 5 output current setting 28h iref6 7:0 w only 00h* led 6 output current setting 29h iref7 7:0 w only 00h* led 7 output current setting 2ah iref8 7:0 w only 00h* led8 output current setting 2bh iref9 7:0 w only 00h* led9 output current setting 2ch iref10 7:0 w only 00h* led10 output current setting 2dh iref11 7:0 w only 00h* led11 output current setting 2eh iref12 7:0 w only 00h* led12 output current setting 2fh iref13 7:0 w only 00h* led13 output current setting 30h iref14 7:0 w only 00h* led14 output current setting 31h iref15 7:0 w only 00h* led15 output current setting
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 15 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.3.8 offset ? ledn output delay offset register the pcu9955 can be programmed to have turn-on delay between ledn outputs. this helps to reduce peak current for the v dd supply and reduces emi. the order in which the ledn outputs are enabled will always be the same (channel 0 will enable first an d channel 15 will enable last). offset control register bits [3:0] determine the delay used between the turn-on times as follows: 0000 = no delay between outputs (all on, all off at the same time) 0001 = delay of 1 clock cycle (1 25 ns) between successive outputs 0010 = delay of 2 clock cycles (250 ns) between successive outputs 0011 = delay of 3 clock cycles (375 ns) between successive outputs : 1111 = delay of 15 clock cycles (1.875 ? s) between successive outputs example: if the value in the offset register is 1000 the corresponding delay = 8 ? 125 ns = 1 ? s delay between successive outputs. channel 0 turns on at time 0 ? s channel 1 turns on at time 1 ? s channel 2 turns on at time 2 ? s channel 3 turns on at time 3 ? s channel 4 turns on at time 4 ? s channel 5 turns on at time 5 ? s channel 6 turns on at time 6 ? s channel 7 turns on at time 7 ? s channel 8 turns on at time 8 ? s channel 9 turns on at time 9 ? s channel 10 turns on at time 10 ? s channel 11 turns on at time 11 ? s channel 12 turns on at time 12 ? s channel 13 turns on at time 13 ? s channel 14 turns on at time 14 ? s channel 15 turns on at time 15 ? s table 12. offset - ledn output delay offset register (address 3ah) bit description legend: * default value. address register bit access value description 3ah offset 7:4 - 0000* not used 3:0 w only 1000* ledn output delay offset factor
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 16 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.3.9 led bit sub call i 2 c-bus addresses for pcu9955 default power-up values are ech, ech, ech. at power-up, subadr1 is enabled while subadr2 and subadr3 are disabled. the power-up default bit subaddress of ech indicates that this device is a 16-channel led driver. all three subaddresses are programmable. once subaddresses have been programmed to their right values, subx bits need to be set to logic 1 in order to have the device respond to these addresses (mode1 register ) (0). when subx is set to logic 1, the corresponding i 2 c-bus subaddress can be used during an ufm i 2 c-bus write sequence. 7.3.10 allcalladr, led all call i 2 c-bus address the led all call i 2 c-bus address allows all the pcu9955s on the bus to be programmed at the same time (allcall bit in register mode1 must be equal to logic 1 (power-up default state)). this address is programmable through the i 2 c-bus and can be used during an i 2 c-bus write sequence. the register address can also be programmed as a sub call. only the 7 msbs representing the all call i 2 c-bus address are valid. the lsb in the allcalladr register is a 0. 7.3.11 reserved1 this register is reserved. table 13. subadr1 to subadr3 - i 2 c-bus subaddress registers 1 to 3 (address 3bh to 3dh) bit description legend: * default value. address register bit symbol access value description 3bh subadr1 7:1 a1[7:1] w only 1110 110* i 2 c-bus subaddress 1 0 a1[0] w only 0* reserved 3ch subadr2 7:1 a2[7:1] w only 1110 110* i 2 c-bus subaddress 2 0 a2[0] w only 0* reserved 3dh subadr3 7:1 a3[7:1] w only 1110 110* i 2 c-bus subaddress 3 0 a3[0] w only 0* reserved table 14. allcalladr - led all call i 2 c-bus address register (address 3eh) bit description legend: * default value. address register bit symbol access value description 3eh allcalladr 7:1 ac[7:1] w only 1110 000* allcall i 2 c-bus address register 0 ac[0] w only 0* reserved
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 17 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.3.12 pwmall ? brightness control for all ledn outputs when programmed, the value in this register will be used fo r pwm duty cycle for all the ledn (n = 0 to 15) outputs. remark: write to any of the pwm0 to pwm15 registers will overwrite the value in corresponding pwmn register. 7.3.13 irefall ? output current value for all ledn outputs the output current setting for all outputs is he ld in this register. wh en this register is written to or updated, all ledn outputs will be set to a current corresponding to this register value. writes to iref0 to iref15 will over write the output current settings. 7.3.14 led driver constant current outputs in led display applications, pcu9955 provides nearly no current variations from channel to channel and from device to device. th e maximum current skew between channels is less than ? 6 % and less than ? 8 % between devices. 7.3.14.1 adjusting output current the pcu9955 scales up the reference current (i ref ) set by the external resistor (r ext ) to sink the output current (i o ) at each output port. the ma ximum output current for the outputs can be set using r ext . in addition, the constant valu e for current drive at each of the outputs is independently programmable using command registers iref0 to iref15. alternatively, programming the irefall register allows all outputs to be set at one current value determined by the value in irefall register. equation 4 and equation 5 can be used to calculate t he minimum and maximum constant current values that can be programmed for the outputs for a chosen r ext . (4) (5) for a given irefx (x = 0 to 15) setting, . table 15. pwmall - brightness control for all ledn outputs register (address 42h) bit description legend: * default value. address register bit access value description 42h pwmall 7:0 w only 0000 0000* duty cycle for all ledn outputs table 16. irefall - output gain control for all ledn outputs (address 43h) bit description legend: * default value. bit symbol access value description 7:0 irefall w only 00h* current gain setting for all ledn outputs. i o _ led _ lsb 900 mv r ext ------------------- 1 4 -- - ? i o _ led _ max 255 i o _ led _ lsb ? ?? 900 mv r ext ------------------- 255 4 -------- - ? ?? ?? i o _ led irefx 900 mv r ext ------------------- ? 1 4 -- - ?
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 18 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver example 1: if r ext =1k ? , i o _led_lsb = 225 ? a, i o _led_max = 57.375 ma. so each channel can be programmed with its individual irefx in 256 steps and in 225 ? a increments to a maximum output current of 57.375 ma independently. example 2: if r ext =2k ? , i o _led_lsb = 112.5 ? a, i o _led_max = 26.687 ma. so each channel can be programmed with its individual irefx in 256 steps and in 112.5 ? a increments to a maximum output channel of 28.687 ma independently. i o(ledn) (ma) = irefx ? (0.9 / 4) / r ext (k ? ) maximum i o(ledn) (ma) = 255 ? (0.9 / 4) / r ext (k ? ) remark: default irefx at power-up = 0. fig 5. i o(target) versus r ext (1) assuming r ext =1k ? . fig 6. i o(target) versus irefx value r ext (k) 1 10 9 48 2 002aag288 0 60 40 20 80 i o(ledn) (ma) 5 6 irefx = 255 3 7 irefx[7:0] value 0 255 191 127 63 002aaf396 20 30 10 40 57.375 (1) i o(target) (ma) 0 31 95 159 223
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 19 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.3.15 overtemperature protection if the pcu9955 chip temperature exceeds its limit (t th(otp) , see ta b l e 1 9 ), all output channels will be disabled unt il the temperature drops belo w its limit minus a small hysteresis (t hys , see ta b l e 1 9 ). once the die temperature reduces below the t th(otp) ? t hys , the chip will return to the same condit ion it was prior to the overtemperature event. 7.4 power-on reset when power is applied to v dd , an internal power-on reset holds the pcu9955 in a reset condition until v dd has reached v por . at this point, the reset condition is released and the pcu9955 registers and i 2 c-bus state machine are initializ ed to their default states (all zeroes) causing all the channels to be deselected. thereafter, v dd must be pulled lower than 1 v and stay low for longer than 20 ? s. the device will reset itself, and allow 2 ms for the device to fully wake up. 7.5 hardware r eset recovery when a reset of pcu9955 is activated using an active low input on the reset pin, a reset pulse width of 2.5 ? s minimum is required. the maximum wait time after reset pin is released is 1.5 ms. 7.6 software reset the software reset call (swrst call) allows all the devices in the i 2 c-bus to be reset to the power-up state value through a specific formatted i 2 c-bus command. the maximum wait time after software reset is 1 ms. the swrst call function is defined as the following: 1. a start command is sent by the i 2 c-bus master. 2. the reserved general call address ?0000 000? with the w bit set to ?0? (write) is sent by the i 2 c-bus master. 3. since pcu9955 is a ufm i 2 c-bus device, no acknowledge is returned to the i 2 c-bus master. 4. once the general call address has been se nt, the master sends 1 byte with 1 specific value (swrst data byte 1): byte 1 = 06h. if more than 1 byte of data is sent, they will be ignored by the pcu9955. 5. once the correct byte (swrst data byte 1) has been sent, the master sends a stop command to end the swrst function: the pcu9955 then resets to the default value (power-up value) and is ready to be addressed again within the specified bus free time (t buf ).
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 20 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 7.7 individual brightness contro l with group dimming/blinking a 31.25 khz fixed frequency signal with progr ammable duty cycle (8 bits, 256 steps) is used to control individually the brightness for each led. on top of this signal, one of the following si gnals can be superimposed (this signal can be applied to the 16 ledn output control registers ledout0 to ledout3): ? a lower 122 hz fixed frequency signal with programmable duty cycle (8 bits, 256 steps) is used to provide a global brightness control. ? a programmable frequency signal from 15 hz to every 16.8 seconds (8 bits, 256 steps) with programmable duty cycle (8 bits, 256 steps) is used to provide a global blinking control. fig 7. swrst call 0 0 0 0 0 0 0 1 s 0 general call address start condition this bit is always = 1 002aaf099 swrst data byte 1 1 this bit is always = 1 p stop condition 0000110 0 minimum pulse width for ledn brightness control is 125 ns. minimum pulse width for group dimming is 32 ? s. when m = 1 (grppwm register value), the re sulting ledn brightness control + group dimming signal will have 1 pulse of the led brightness control signal (pulse width = n ? 125 ns, with ?n? defined in pwmx register). this resulting brightness + group dimming signal above shows a resulting control signal with m = 8. fig 8. brightness + group dimming signals 123456789101112 251 252 253 254 255 256 1234567891011 brightness control signal (ledn) m 256 125 ns with m = (0 to 255) (grppwm register) n 125 ns with n = (0 to 255) (pwmx register) 256 125 ns = 32 s (31.25 khz) 12345678 12345678 group dimming signal resulting brightness + group dimming signal 256 256 125 ns = 8.19 ms (122 hz) 002aaf935
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 21 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 8. characteristics of the pcu9955 ultra fast-mode i 2 c-bus the pcu9955 led controller uses the new ultra fast-mode (ufm) i 2 c-bus to communicate with the ufm i 2 c-bus capable host controller. like the standard mode and fast-mode plus (fm+) i 2 c-bus, it uses two lines for communication. they are a serial data line (usda) and a serial clock line (uscl). the ufm is a unidirectional bus that is capable of higher frequency (up to 5 mhz). the ufm i 2 c-bus slave devices operate in receive-only mode. that is, only i 2 c writes to pcu9955 are supported. 8.1 bit transfer one data bit is transferred during each cl ock pulse. the data on the usda line must remain stable during the high period of the cl ock pulse as changes in the data line at this time will be interpreted as control signals (see figure 9 ). 8.1.1 start and stop conditions both data and clock lines remain high when the bus is not busy. a high-to-low transition of the data line while the clock is high is defined as the start condition (s). a low-to-high transition of the data line while the clock is high is defined as the stop condition (p) (see figure 10 ). fig 9. bit transfer 002aaf113 data line stable; data valid change of data allowed usda uscl fig 10. definition of start and stop conditions 002aaf114 usda uscl p stop condition s start condition
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 22 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 8.2 system configuration a device generating a message is a ?transmitter ?; a device receiving is the ?receiver?. the device that controls the message is the ?master? and the devices which are controlled by the master are the ?slaves? (see figure 11 ). 8.3 data transfer the number of data bytes transferred betwe en the start and the stop conditions from transmitter to receiver is not limited. each byte of eight bits is followed by one bit that is always set to 1. the master gene rates an extra related clock pulse. fig 11. system configuration 002aaf100 slave ufm receiver usda uscl master ufm transmitter slave ufm receiver slave ufm receiver fig 12. data transfer 002aaf101 s start condition 9 8 2 1 usda data output by master ufm transmitter uscl clock from master
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 23 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 9. bus transactions (1) see table 4 for register definition. fig 13. write to a specific register 1 0 a3 a2 a1 a0 0 1 s 1 slave address start condition w this bit is always = 1 002aaf102 data for register d[7:0] d6 d5 d4 d3 d2 d1 d0 aif control register (1) auto-increment flag 1 this bit is always = 1 1 this bit is always = 1 p stop condition (1) ai1, ai0 = 00. see table 3 for auto-increment options. remark: care should be taken to load the appropriate value here in the ai1 and ai0 bits of the mode1 register for programming the part with the required auto-increment options. fig 14. write to all registers using the auto-increment feature 1 0 a3 a2 a1 a0 0 1 s 1 slave address start condition w this bit is always = 1 002aaf103 mode1 register data (1) 0 0 0 0 0 0 0 1 control register auto-increment on 1 this bit is always = 1 1 this bit is always = 1 p stop condition (cont.) (cont.) mode1 register selection mode2 register data 1 this bit is always = 1 allcall address register data 1 this bit is always = 1
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 24 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver this example assumes that aif + ai[1:0] = 101b. fig 15. multiple writes to indivi dual brightness registers only using the auto-increment feature 1 0 a3 a2 a1 a0 0 1 s 1 slave address start condition w this bit is always = 1 002aaf104 pwm0 register data 0 0 0 1 0 1 0 1 control register auto-increment on 1 this bit is always = 1 1 this bit is always = 1 p stop condition (cont.) (cont.) pwm0 register selection pwm1 register data 1 this bit is always = 1 pwm14 register data 1 this bit is always = 1 pwm15 register data 1 this bit is always = 1 pwm0 register data 1 this bit is always = 1 register rollover pwm14 register data 1 this bit is always = 1 pwm15 register data 1 this bit is always = 1
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 25 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver (1) in this example, several pcu9955s are used and the same sequence (a) (above) is sent to each of them. (2) allcall bit in mode1 register is pr eviously set to 1 for this example. (3) och bit in mode2 register is prev iously set to 1 for this example. fig 16. led all call i 2 c-bus address programming and led all call sequence example 1 0 a3 a2 a1 a0 0 1 s 1 slave address (1) start condition w this bit is always set to 1 002aaf105 0 1 1 1 1 1 0 1 control register auto-increment on 1 this bit is always set to 1 allcalladr register selection 0 1 0 1 0 1 x 1 new led all call i 2 c address (2) p stop condition 1 this bit is always set to 1 0 1 0 1 0 1 0 1 s 1 led all call i 2 c address start condition w this bit is always set to 1 0 0 0 0 0 1 0 1 control register 1 this bit is always set to 1 ledout0 register selection 1 0 1 0 1 0 1 0 ledout0 register (led fully on) p stop condition 1 the 16 leds are on at the 9th bit (3) sequence (a) sequence (b) (cont.) (cont.) 1 0 1 0 1 0 1 0 ledout1 register (led fully on) 1 the 16 leds are on at the 9th bit (3) 1 0 1 0 1 0 1 0 ledout2 register (led fully on) 1 the 16 leds are on at the 9th bit (3) this bit is always set to 1 this bit is always set to 1 this bit is always set to 1 1 0 1 0 1 0 1 0 ledout3 register (led fully on) 1 the 16 leds are on at the 9th bit (3) this bit is always set to 1
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 26 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 10. application design-in information 10.1 thermal considerations since the pcu9955 device integrates 16 linea r current sources, thermal considerations should be taken into account to prevent overheating, which can cause the device to go into thermal shutdown. perhaps the major contributor for device?s overheating is the led forward voltage mismatch. this is because it can cause significant voltage differences between the led strings of the same type (e.g., 2 v to 3 v), wh ich ultimately translates into higher power dissipation in the device. the voltage drop ac ross the led channels of the device is given by the difference between the supply voltage and the led forward voltage of each led (1) a standard 10 k ? pull-up resistor is required to obtain the best system level esd performance. fig 17. typical application pcu9955 led0 usda uscl v dd = 3.3 v or 5.0 v ufm master usda uscl a0 a1 a2 v dd a3 v ss 002aaf106 v ss reset reset rext iset led1 led2 led3 led4 led5 led6 led7 led8 led9 led10 led11 led12 led13 led14 led15 1.1 k (optional) up to 40 v c 10 f 10 k (1)
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 27 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver string. reducing this to a minimum (e.g., 0. 8 v) helps to keep the power dissipation down. therefore leds binning is recommended to minimize led voltage forward variation and reduce power dissipation in the device. in order to en sure that the device will no t go into thermal shutdo wn when operating under certain application conditions, its junction temperature (t j ) should be calculated to ensure that is below the overtemperature threshold limit (125 ? c). the t j of the device depends on the ambient temperature (t amb ), device?s total power dissipation (p tot ), and thermal resistance. the device junction temperature can be calculated by using the following equation: (6) where: t j = junction temperature t amb = ambient temperature r th(j-a) = junction to ambient thermal resistance p tot = (device) total power dissipation an example of this calculation is show below: conditions: t amb = 50 ? c r th(j-a) = 31 ? c/w (per jedec 51 standard for multilayer pcb) i led = 50 ma / channel i dd(max) = 12 ma v dd = 5 v leds per channel = 10 leds / channel led v f(typ) = 3 v per led (30 v total for 10 leds in series) led v f mismatch = 0.2 v per led (2 v total for 10 leds in series) v reg(drv) = 0.8 v (this will be present only in t he led string with the highest led forward voltage.) v sup = led v f(typ) + led v f mismatch + v reg(drv) = 30 v + 2 v + 0.8 v = 32.8 v p tot calculation: p tot = ic_power + led drivers_power; ic_power = (i dd ? v dd ) ic_power = (0.012 a ? 5 v) = 0.06 w led drivers_power = [(16 ? 1) ? (i led ) ? (led v f mismatch + v reg(drv) )] + (i led ? v reg(drv) ) led drivers_power = [15 ? 0.05 a ? (2 v + 0.8 v)] + (0.05 a ? 0.8 v) = 2.14 w p tot = 0.06 w + 2.14 w = 2.2 w t j t amb r th j - a ?? p tot ? +=
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 28 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver t j calculation: t j = t amb + r th(j-a) ? p tot t j = 50 ? c + (31 ? c/w ? 2.2 w) = 118.2 ? c this confirms that the junction temperat ure is below the minimum overtemperature threshold of 125 ? c, which ensures the device will not go into thermal shutdown under these conditions. it is important to mention that the value of the thermal resistance junction-to-ambient (r th(j-a) ) strongly depends in the pcb design. th erefore, the thermal pad of the device should be attached to a big enough pcb copper area to ensure proper thermal dissipation (similar to jedec 51 standard). several thermal vias in the pcb thermal pad should be used as well to increase the effectiveness of the heat dissipation (e.g., 15 thermal vias). the thermal vias should be distribute d evenly in the pcb thermal pad. finally it is important to poin t out that this calculation should be taken as a reference only and therefore ev aluations should still be performed under the app lication environment and conditions to confirm proper system operation. 11. limiting values [1] class ii, level b for a1 (pin 3), a2 (pin 4). all other pins are class ii, level a ( ? 100 ma). 12. thermal characteristics [1] per jedec 51 standard for multilayer pcb. table 17. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit v dd supply voltage ? 0.5 +6.0 v v i/o voltage on an input/output pin v ss ? 0.5 5.5 v v drv(led) led driver voltage v ss ? 0.5 40 v i o(ledn) output current on pin ledn - 65 ma i ss ground supply current - 1.0 a i lu latch-up current jesd [1] -9 0m a p tot total power dissipation t amb =25 ? c- 3.2w t amb =85 ? c- 1.3w t stg storage temperature ? 65 +150 ?c t amb ambient temperature operating ? 40 +85 ?c t j junction temperature ? 40 +125 ?c table 18. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient htssop28 [1] 31 ?c/w
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 29 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 13. static characteristics table 19. static characteristics v dd = 3 v to 5.5 v; v ss =0v; t amb = ? 40 ? cto+85 ? c; unless otherwise specified. symbol parameter conditions min typ max unit supply v dd supply voltage 3 - 5.5 v i dd supply current on pin v dd ; operating mode; no load; f uscl =5mhz v dd =3.3v - 6.5 14 ma v dd =5.5v - 7.0 15 ma i dd supply current r ext = open; led[15:0] = off - 0.7 14 ma r ext =2k ? ; led[15:0] = off - 2 14 ma r ext =1k ? ; led[15:0] = off - 3 15 ma r ext =2k ? ; led[15:0] = on - 2 15 ma r ext =1k ? ; led[15:0] = on - 3 16 ma i stb standby current on pin v dd ; no load; f uscl =0hz; mode1[4] = 1; v i =v dd v dd = 3.3 v - 100 600 ? a v dd = 5.5 v - 100 700 ? a v por power-on reset voltage no load; v i =v dd or v ss - 2.65 2.8 v v pdr power-down reset voltage no load; v i =v dd or v ss [1] 0.8 1.25 - v input uscl; input usda v il low-level input voltage ? 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -5.5v i l leakage current v i =v dd or v ss ? 1- +1 ? a c i input capacitance v i =v ss - 6 10 pf current controlled outputs (led[15:0]) i o output current v o = 0.8 v; irefx = ffh r ext =1k ? 52 57.5 62 ma r ext =2k ? 25.5 28.5 31.5 ma ? i o output current variation v o = 0.8 v; irefx = ffh between bits (different ics, same channel); r ext =1k ? - ? 2.5 ? 8% between bits (2 channels, same ic); r ext =2k ? - ? 1.7 ? 5.8 % v reg(drv) driver regulation voltage minimum regulation voltage; irefx = ffh; r ext =1k ? 0.8 1.0 40 v i l(off) off-state leakage current v o =40v ? 1- +1 ? a address inputs, reset input v il low-level input voltage ? 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -5.5v i li input leakage current ? 1- +1 ? a c i input capacitance - 3.7 5 pf
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 30 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver [1] v dd must be lowered to 0.8 v in order to reset part. 14. dynamic characteristics [1] minimum uscl clock frequency is limited by the bus time-out feature, which resets t he serial bus interface if either usda or uscl is held low for a minimum of 25 ms. disable bus time-out feature for dc operation. overtemperature protection t th(otp) overtemperature protection threshold temperature rising 125 145 160 ?c hysteresis - 20 - ?c table 19. static characteristics ?continued v dd = 3 v to 5.5 v; v ss =0v; t amb = ? 40 ? cto+85 ? c; unless otherwise specified. symbol parameter conditions min typ max unit table 20. dynamic characteristics all the timing limits are valid within the operating supply voltage and ambient temperature range; v dd =3v ? 0.2 v and 5.5 v ? 0.3 v; t amb = ? 40 ? c to +85 ? c; and refer to v il and v ih with an input voltage of v ss to v dd . symbol parameter conditions min typ max unit f uscl uscl clock frequency [1] 0- 5mhz t buf bus free time between a stop and start condition 0.08 - - ? s t hd;sta hold time (repeated) start condition 0.05 - - ? s t su;sta set-up time for a repeated start condition 0.05 - - ? s t su;sto set-up time for stop condition 0.05 - - ? s t hd;dat data hold time 10 - - ns t su;dat data set-up time 30 - - ns t low low period of the uscl clock 50 - - ns t high high period of the uscl clock 50 - - ns t f fall time of both usda and uscl signals - - 50 ns t r rise time of both usda and uscl signals - - 50 ns t sp pulse width of spikes that must be suppressed by the input filter --10ns fig 18. definition of timing t sp t buf t hd;sta p p s t low t r t hd;dat t f t high t su;dat t su;sta sr t hd;sta t su;sto usda uscl 002aaf115 0.7 v dd 0.3 v dd 0.7 v dd 0.3 v dd
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 31 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 15. test information rise and fall times refer to v il and v ih . fig 19. i 2 c-bus timing diagram uscl usda t hd;sta t su;dat t hd;dat t f t buf t su;sta t low t high 002aag332 t su;sto protocol start condition (s) bit 7 msb bit 6 bit 1 (d1) bit 0 (d0) 1 / f uscl t r (always set to 1 by master) stop condition (p) 9th clock 0.3 v dd 0.7 v dd 0.3 v dd 0.7 v dd r l = load resistor for ledn. c l = load capacitance includes jig and probe capacitance. r t = termination resistance should be equal to the output impedance z o of the pulse generators. fig 20. test circuitry for switching times pulse generator v o c l 50 pf r l 50 002aag289 r t v i v dd dut v led open v ss
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 32 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 16. package outline fig 21. package outline sot1172-2 (htssop28) references outline version european projection issue date iec jedec jeita sot1172-2 - - - mo-153 - - - sot1172-2_po unit mm max nom min 1.1 0.15 0.10 0.05 0.25 0.30 0.22 0.19 9.8 9.7 9.6 5.6 5.5 5.4 a dimensions note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. htssop28: plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 a 1 a 2 0.95 0.90 0.85 a 3 b p 0.75 0.62 0.50 0.40 0.37 0.3 0.2 l p qv c 0.20 0.15 0.10 d (1) d h e (2) 4.5 4.4 4.3 e h 2.3 2.2 2.1 e 0.65 1.0 6.6 6.4 6.2 h e l 0.1 0.80 0.63 0.50 8 4 0 yz 0.13 w 0 2.5 5 mm scale y exposed die pad side d d h z b p w e h e pin 1 index 14 1 28 15 detail x q a a 3 a 1 a 2 l p l c x h e va e a 10-07-06 10-07-13
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 33 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 17. handling information all input and output pins are protected ag ainst electrostatic discharge (esd) under normal handling. when handling ensure that the appropriate precautions are taken as described in jesd625-a or equivalent standards. 18. soldering of smd packages this text provides a very brief insight into a complex technology. a more in-depth account of soldering ics can be found in application note an10365 ?surface mount reflow soldering description? . 18.1 introduction to soldering soldering is one of the most common methods through which packages are attached to printed circuit boards (pcbs), to form electr ical circuits. the soldered joint provides both the mechanical and the electrical connection. th ere is no single sold ering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mount devices (smds) are mixed on one printed wiring board; however, it is not suitable for fine pitch smds. reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 18.2 wave and reflow soldering wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. the wave soldering process is suitable for the following: ? through-hole components ? leaded or leadless smds, which are glued to the surface of the printed circuit board not all smds can be wave soldered. packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. also, leaded smds with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased pr obability of bridging. the reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. leaded packages, packages with solder balls, and leadless packages are all reflow solderable. key characteristics in both wave and reflow soldering are: ? board specifications, in cluding the board finish , solder masks and vias ? package footprints, including solder thieves and orientation ? the moisture sensitivit y level of the packages ? package placement ? inspection and repair ? lead-free soldering versus snpb soldering 18.3 wave soldering key characteristics in wave soldering are:
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 34 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver ? process issues, such as application of adhe sive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave ? solder bath specifications, including temperature and impurities 18.4 reflow soldering key characteristics in reflow soldering are: ? lead-free versus snpb solderi ng; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see figure 22 ) than a snpb process, thus reducing the process window ? solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board ? reflow temperature profile; this profile includ es preheat, reflow (in which the board is heated to the peak temperature) and cooling down. it is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). in addition, the peak temperature must be low enough that the packages and/or boards are not damaged. the peak temperature of the package depends on package thickness and volume and is classified in accordance with ta b l e 2 1 and 22 moisture sensitivity precautions, as indicat ed on the packing, must be respected at all times. studies have shown that small packages reach higher temperatures during reflow soldering, see figure 22 . table 21. snpb eutectic process (from j-std-020c) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 ? 350 < 2.5 235 220 ? 2.5 220 220 table 22. lead-free process (from j-std-020c) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 35 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver for further information on temperature profiles, refer to application note an10365 ?surface mount reflow soldering description? . 19. abbreviations msl: moisture sensitivity level fig 22. temperature profiles for large and small components 001aac844 temperature time minimum peak temperature = minimum soldering temperature maximum peak temperature = msl limit, damage level peak temperature table 23. abbreviations acronym description ack acknowledge cdm charged-device model dut device under test emc electromagnetic compatibility esd electrostatic discharge fet field-effect transistor hbm human body model i 2 c-bus inter-integrated circuit bus lcd liquid crystal display led light emitting diode lsb least significant bit msb most significant bit nmos negative-channel metal-oxide semiconductor pcb printed-circuit board pmos positive-channel metal-oxide semiconductor pwm pulse width modulation rgb red/green/blue rgba red/green/blue/amber smbus system management bus
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 36 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 20. references [1] an10897, ?a guide to designing for esd and emc? ? nxp semiconductors [2] an11131, ?how to improve system level esd performance? ? nxp semiconductors 21. revision history table 24. revision history document id release date data sheet status change notice supersedes pcu9955 v.2 20121002 product data sheet - pcu9955 v.1 modifications: ? table 5 ? mode1 - mode register 1 (address 00h) bit description ? , table note [1] , first sentence: changed from ?set to logic 1? to ?set to logic 0? ? section 7.2 ? control register ? : ? second paragraph on page 9: changed from ?ai0 = 1? to ?ai0 = 0?; changed from ?keeps sending or reading data? to ?keeps sending data? ? third paragraph on page 9: changed from ?keeps sending or reading data? to ?keeps sending data? ? section 7.5 ? hardware reset recovery ? , first paragraph, second sentence: deleted ?(typical)? ? section 7.6 ? software reset ? , second paragraph, first sentence: deleted ?(typical)? pcu9955 v.1 20111117 product data sheet - -
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 37 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver 22. legal information 22.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 22.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 22.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
pcu9955 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 2 october 2012 38 of 39 nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 22.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. i 2 c-bus ? logo is a trademark of nxp b.v. 23. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors pcu9955 16-channel ufm i 2 c-bus 57 ma constant current led driver ? nxp b.v. 2012. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 2 october 2012 document identifier: pcu9955 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 24. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 2 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 ordering information . . . . . . . . . . . . . . . . . . . . . 3 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 5 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 7 functional description . . . . . . . . . . . . . . . . . . . 6 7.1 device addresses . . . . . . . . . . . . . . . . . . . . . . . 6 7.1.1 regular i 2 c-bus slave address. . . . . . . . . . . . . 6 7.1.2 led all call i 2 c-bus address . . . . . . . . . . . . . . 7 7.1.3 led bit sub call i 2 c-bus addresses. . . . . . . . . 7 7.2 control register . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.3 register definitions . . . . . . . . . . . . . . . . . . . . . . 9 7.3.1 mode1 ? mode register 1 . . . . . . . . . . . . . . 11 7.3.2 mode2 ? mode register 2 . . . . . . . . . . . . . . 11 7.3.3 ledout0 to ledout 3, led driver output state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.3.4 grppwm, group duty cycle control . . . . . . . . 12 7.3.5 grpfreq, group frequency . . . . . . . . . . . . . 13 7.3.6 pwm0 to pwm15, individual brightness control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.3.7 iref0 to iref15, ledn output current value registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.3.8 offset ? ledn output delay offset register 15 7.3.9 led bit sub call i 2 c-bus addresses for pcu9955 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.3.10 allcalladr, led all call i 2 c-bus address. 16 7.3.11 reserved1 . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.3.12 pwmall ? brightness control for all ledn outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.3.13 irefall ? output current value for all ledn outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.3.14 led driver constant current outputs . . . . . . . . 17 7.3.14.1 adjusting output current . . . . . . . . . . . . . . . . . 17 7.3.15 overtemper ature protection . . . . . . . . . . . . . . 19 7.4 power-on reset . . . . . . . . . . . . . . . . . . . . . . . . 19 7.5 hardware reset recovery . . . . . . . . . . . . . . . . 19 7.6 software reset. . . . . . . . . . . . . . . . . . . . . . . . . 19 7.7 individual brightness control with group dimming/blinking . . . . . . . . . . . . . . . . . . . . . . . 20 8 characteristics of the pcu9955 ultra fast-mode i 2 c-bus . . . . . . . . . . . . . . . . . . . . . . 21 8.1 bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.1.1 start and stop conditions . . . . . . . . . . . . . 21 8.2 system configuration . . . . . . . . . . . . . . . . . . . 22 8.3 data transfer . . . . . . . . . . . . . . . . . . . . . . . . . 22 9 bus transactions . . . . . . . . . . . . . . . . . . . . . . . 23 10 application design-in information. . . . . . . . . 26 10.1 thermal considerations . . . . . . . . . . . . . . . . . 26 11 limiting values . . . . . . . . . . . . . . . . . . . . . . . . 28 12 thermal characteristics . . . . . . . . . . . . . . . . . 28 13 static characteristics . . . . . . . . . . . . . . . . . . . 29 14 dynamic characteristics. . . . . . . . . . . . . . . . . 30 15 test information . . . . . . . . . . . . . . . . . . . . . . . 31 16 package outline. . . . . . . . . . . . . . . . . . . . . . . . 32 17 handling information . . . . . . . . . . . . . . . . . . . 33 18 soldering of smd packages . . . . . . . . . . . . . . 33 18.1 introduction to soldering. . . . . . . . . . . . . . . . . 33 18.2 wave and reflow soldering. . . . . . . . . . . . . . . 33 18.3 wave soldering . . . . . . . . . . . . . . . . . . . . . . . 33 18.4 reflow soldering . . . . . . . . . . . . . . . . . . . . . . 34 19 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 35 20 references. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 21 revision history . . . . . . . . . . . . . . . . . . . . . . . 36 22 legal information . . . . . . . . . . . . . . . . . . . . . . 37 22.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 37 22.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 22.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 37 22.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 38 23 contact information . . . . . . . . . . . . . . . . . . . . 38 24 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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