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preliminary data this is preliminary information on a new product now in deve lopment or undergoing evaluation. details are subject to change without notice. december 2009 doc id 15819 rev 4 1/35 35 stp1612pw05 16-channel led driver with 16-bit pwm, 8-bit gain and full led error detection features 16 constant current output channels supply voltage: 3.3 v or 5 v two pwm selectable counters 12/16-bit of grayscale selectable enhanced pwm for ghost effect reduction open and short led detection 8-bit current gain control by means of 256 steps in two selectable ranges single resistor to set the current from 3 ma to 60 ma programmable progressive output delay thermal protection and thermal flag uvlo schmitt trigger input selectable 16-bit or 256-bit serial data-in format max clock frequency: 30 mhz esd protection 2.5 kv hbm, 200 v mm drop-in compatible with stp16cp\s\dp05 series available in high thermal efficiency tssop exposed pad applications video display led panels rgb backlighting special lighting description the stp1612pw05 is a 16-channel constant current sink led driver. the maximum output current value for all the 16 channels is set by a single resistor from 3 ma to 60 ma. the device features 8-bit gain (256 steps) for global led brightness adjustment with two selectable ranges. this function is accessible via a serial interface. the device has an individual adjustable pwm brightness control for each output channel. the pwm counters are selectable via a serial interface with 4096 or 65536 steps (12 or 16 bit). the stp1612pw05 also provides enhanced pulse-width modulation counting algorithms called e-pwm to reduce flickering effects (ghost visual effects) improving the overall image quality. the device has a dual size 16-bit or 256-bit shift register. all the control and the shift register read back data are accessible via serial interface. the stp1612pw05 has the cap ability to detect open and short led failure and overtemperature, reporting the status through spi line. the device guarantees a 20 v output driving capability, allowing the user to connect more leds in series. so-24 tssop24 tssop24 exposed pad qfn-24 table 1. device summary order code package packaging stp1612pw05qtr qfn-24 4000 parts per reel STP1612PW05MTR so-24 1000 parts per reel stp1612pw05ttr tssop24 2500 parts per reel stp1612pw05xttr tssop24 exposed pad 2500 parts per reel www.st.com
contents stp1612pw05 2/35 doc id 15819 rev 4 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 pin connection and description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 definition of conf iguration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 grey scales data loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 setting the pwm gray scale count er . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9.1 pwm data synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9.2 synchronization for pwm counting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 10 error detection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 11 setting output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 12 current gain adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 13 delay time of staggered output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 14 thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 15 time-out alert of gclk di sconnection . . . . . . . . . . . . . . . . . . . . . . . . . 24
stp1612pw05 contents doc id 15819 rev 4 3/35 16 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 17 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
block diagram stp1612pw05 4/35 doc id 15819 rev 4 1 block diagram figure 1. block diagram pwm a nd e-pwm 12/16 b it co u nter a nd s ync control s eri a l interf a ce uvlo & por vdd gnd s di clk le s do con s t a nt c u rrent o u tp u t ch a nnel s 1----------16 t s d 16- b it config u r a tion regi s ter s hift regi s ter d ua l s ize mode (16 or 256 b it) pwclk d ua l r a nge g a in 7- b it dac pwm d a t a bu ffer (16x16 b it) gr a d ua l o u tp u t s del a y ctrl comm a nd a nd ctrl logic open/ s hort error detection r-ext
stp1612pw05 summary description doc id 15819 rev 4 5/35 2 summary description table 2. typical current accuracy at 5 v output voltage current accuracy output current v dd temp. between bits between ics 1.0 1.5% 6% 15 to 60 5 v 25 c 0,2 1.5% 6% 3 to 15 table 3. typical current accuracy at 3.3 v output voltage current accuracy output current v dd temp. between bits between ics 1.0 1.5% 6% 15 to 60 3.3 v 25 c 0,3 1.5% 6% 3 to 15
summary description stp1612pw05 6/35 doc id 15819 rev 4 2.1 pin connection and description figure 2. pin connection note: the exposed pad should be electrically conn ected to a metal land electrically isolated or connected to ground 14 1 3 15 16 17 1 8 5 6 4 3 2 1 8 7 9101112 2 3 24 22 21 20 19 clk s di vdd r-ext s do out7 out4 out6 out 3 out2 out1 out0 le out 8 out1 3 out12 out11 out10 out9 out5 out14 out15 pwclk gnd table 4. pin description pin n symbol name and function 1 gnd ground terminal 2 sdi serial data input terminal 3clk clock input terminal used to shift data on rising edge and carries command information when le is asserted. 4 le data strobe terminal and controlling command with clk 5-20 out 0-15 output terminals 21 pwclk gray scale clock terminal. reference clock for grey scale pwm counter. 22 sdo serial data out terminal 23 r-ext input terminal of an external resistor for constant current programing 24 v dd supply voltage terminal
stp1612pw05 electrical ratings doc id 15819 rev 4 7/35 3 electrical ratings 3.1 absolute maximum ratings stressing the device above the rating listed in the ta bl e 5 may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 3.2 thermal data table 5. absolute maximum ratings symbol parameter value unit v dd supply voltage 0 to 7 v v o output voltage -0.5 to 20 v i o output current 60 ma v i input voltage -0.4 to v dd v i gnd gnd terminal current 1300 ma f clk clock frequency 50 mhz t j junction temperature range (1) 1. such absolute value is based on the thermal shutdown protection. -40 to + 170 c table 6. thermal data symbol parameter value unit t a operating free-air temperature range -40 to +125 c t j-opr operating thermal junction temperature range -40 to +150 c t stg storage temperature range -55 to +150 c r thja thermal resistance junction- ambient (1) 1. according to jedec standard 51-7b so-24 42.7 c/w tssop24 55 c/w tssop24 (2) exposed pad 2. the exposed pad should be soldered directly to the pcb to realize the thermal benefits. 37.5 c/w qfn-24 55 c/w
electrical ratings stp1612pw05 8/35 doc id 15819 rev 4 3.3 recommended operating conditions table 7. recommended operating conditions at 25 c, v dd = 5 v symbol parameter test conditions min. typ. max. unit v dd supply voltage 3.0 - 5.5 v v o output voltage - 20 v i o output current outn 3 - 60 ma i oh output current serial-out - +1 ma i ol output current serial-out - -1 ma v ih input voltage 0.7 v dd -v dd v v il input voltage gnd - 0.3 v dd v t wlat le pulse width v dd = 3.3 v to 5.0 v 20 - ns t wclk clk pulse width 10 - ns t wen pwclk pulse width 20 - ns t setup(d) setup time for data 5 - ns t hold(d) hold time for data 5 - ns t setup(l) setup time for latch 5 - ns f clk clock frequency cascade operation (1) 1. if the device is connected in ca scade, it may not be possible achiev e the maximum data transfer. please considered the ti mings carefully. -30mhz
stp1612pw05 electrical characteristics doc id 15819 rev 4 9/35 4 electrical characteristics t a = 25 c (unless otherwise specified) table 8. electrical characteristics (v dd = 5.0 v) symbol characteristics test conditions min. typ. max. unit v dd supply voltage 4.5 5.0 5.5 v v o maximum output voltage out0 ~ out15 20 v i out output current v o = 1.2v 5 60 ma i oh sdo, t a = - 40 ~ 125 c -8 ma i ol sdo, t a = - 40 ~ 125 c 8 ma v ih input voltage ?h? level t a = - 40 ~ 125 c 0.7 * v dd v dd v v il input voltage ?l? level t a = - 40 ~ 125 c gnd 0.3 * v dd v i oh output leakage current v o = 20 v 10 a v ol output voltage sdo i ol = + 1.0 ma, t a = - 40 ~ 125 c 0.4 v v oh i oh = -1.0 ma t a = - 40 ~ 125 c v dd - 0.4 v di out1 current skew (channel) i out = 10 ma v o = 1.0 v, r ext = 69 k 1.5 3.0 % di out2 current skew (ic) i out = 10 ma v o = 1.0 v, r ext = 69 k 3.0 6.0 % %/d v o output current vs. output voltage regulation v o within 1.0 v and 3.0 v, r ext = 34.7 k @ 20 ma 0.1 0.5 % / v %/ dv dd output current vs. supply voltage regulation v dd within 4.5 v and 5.5 v 1.0 5.0 % / v v o,th 0.15 0.20 v r in(down) pull-down resistor le 150 200 250 k i dd(off) 1 supply current ? off ? r ext = open , out0 ~ out15 = off 71013 ma i dd(off) 2 i o = 20 ma, out0 ~ out15 = off 6.6 9.5 12 i dd(off) 3 i o = 60 ma, out0 ~ out15 = off 9 12.7 16.5 i dd(on) 1 supply current ? on ? i o = 20 ma, out0 ~ out15 = on 6.6 9.4 12.2 i dd(on) 2 i o = 60 ma, out0 ~ out15 = on 8 11.5 14.9
electrical characteristics stp1612pw05 10/35 doc id 15819 rev 4 table 9. electrical characteristics (v dd = 3.3 v) symbol characteristics test conditions min. typ. max. unit v dd supply voltage 3.0 3.3 3.6 v v o sustaining voltage at out ports out0 ~ out15 20 v i out output current v o = 1.2 v 5 60 ma i oh sdo, t a = -40 ~ 125 c -1.0 ma i ol sdo t a = -40 ~ 125 c 1.0 ma v ih input voltage ?h? level t a = - 40 ~ 125 c 0.7 * v dd v dd v v il input voltage ? l ? level t a = - 40 ~ 125 c gnd 0.3 * v dd v i oh output leakage current v o = 17.0 v 0.5 a v ol output voltage sdo i ol = +1.0 ma, t a = -40 ~ 125 c 0.4 v v oh i oh = -1.0 ma t a = -40 ~ 125 c 2.9 v di out1 current skew (channel) i out = 10.5 ma, v o = 1.0 v, r ext = 69 k at 10 ma 1.5 3.0 % di out2 current skew (ic) i out = 10.8 ma, v o = 1.0 v, r ext = 69 k at 10 ma 3.0 6.0 % %/d v o output current vs. output voltage regulation v o within 1.0 v and 3.0 v, r ext = 34.7 k at 20 ma 0.1 0.5 % / v %/dv dd output current vs. supply voltage regulation v dd within 3.0 v and 3.6 v 1.0 5.0 % / v r in(down) pull-down resistor le 150 200 250 k i dd(off) 1 supply current ?off? r ext = open, out0 ~ out15 = off 7.2 9.3 ma i dd(off) 2 i o = 20 ma, out0 ~ out15 = off 8.6 11 i dd(off) 3 i o = 60 ma, out0 ~ out15 = off 11.7 15.2 i dd(on) 1 supply current ?on? i o = 20 ma, out0 ~ out15 = on 29 37.7 i dd(on) 2 i o = 60 ma, out0 ~ out15 = on 31.2 40
stp1612pw05 electrical characteristics doc id 15819 rev 4 11/35 figure 3. test circuit for electrical characteristics table 10. switching characteristics (v dd = 5.0 v) t a = -40 ~ 125 c symbol characteristics conditions min. typ. max. unit t su0 setup time sdi - clk v dd = 5.0 v v ih = v dd v il = gnd r ext = 460 v led = 4.5 v r l = 152 cl = 10 pf c1 = 100 nf c2 = 10 f i o = 20 ma 1 ns t su1 le ? dclk 1 ns t su2 le ? dclk 5 ns t h0 hold time clk - sdi 3 ns t h1 clk - le 7 ns t pd0 propagation delay time clk - sdo 30 40 ns t pd1 pwclk-outn4 (1) 1. refer to the timing waveform, where n = 0, 1, 2, 3. 100 ns t pd2 le ? sdo (2) 2. in timing of ?read configuration? and ?read error st atus code?, the next clk rising edge should be t pd2 after the falling edge of le. 30 40 ns t dl1 stagger delay time outn4 + 1 (1) 40 ns t dl2 outn4 + 2 (1) 80 ns t dl3 outn4 +3 (1) 120 ns t w(l) pulse width le 5 ns t w( clk) clk 20 ns t w(pwclk) pwclk 20 ns t on output rise time of output ports 10 ns t off output fall time of output ports 6 ns t edd error detection minimum duration (3) 3. refer to figure 5 on page 13 . 1s pwclk clk le dd v ext - r gnd sdo out0 . . . generator function dd i v ih =v dd v il =gnd waveform input logic sdi out15 out i v ih ,v il v dd r ext i ol i oh
electrical characteristics stp1612pw05 12/35 doc id 15819 rev 4 figure 4. test circuit for switching characteristics table 11. switching characteristics (v dd = 3.3 v) symbol characterist ics conditions min. typ. max. unit t su0 setup time sdi - dclk v dd = 3.3 v v ih = v dd v il = gnd r ext = 460 v led = 4.5 v r l = 152 cl = 10 pf c1 = 100 nf c2 = 10 f 1 ns t su1 le ? dclk 1 ns t su2 le ? dclk 5 ns t h0 hold time clk - sdi 3 ns t h1 clk - le 7 ns t pd0 propagation delay time clk - sdo 45 40 ns t pd1 pwclk-outn4 (1) 1. refer to the timing waveform figure 4 , where n = 0, 1, 2, 3. 120 ns t pd2 le ? sdo (2) 2. in timing of ?read configurati on? and ?read error status code?, the next clk rising edge should be t pd2 after the falling edge of le. 45 40 ns t dl1 stagger delay time outn4 + 1 (1) 40 ns t dl2 outn4 + 2 (1) 80 ns t dl3 outn4 +3 (1) 120 ns t w(l) pulse width le 5 ns t w(clk) clk 20 ns t w(pwclk) pwclk 20 ns t on output rise time of output ports 11.6 ns t off output fall time of output ports 7 ns t dec error detection duration 0.5 1 s pwclk clk le dd v ext - r gnd sdo out0 . . . generator function dd i out i c l v led waveform input logic sdi out15 1 c 2 c v ih ,v il v ih =v dd v il =gnd r ext r l r l c l c l v dd
stp1612pw05 timi ng waveform doc id 15819 rev 4 13/35 5 timing waveform figure 5. timing waveform pwclk pwclk pwclk
principle of operation stp1612pw05 14/35 doc id 15819 rev 4 6 principle of operation table 12. control command signals combination description command name le number of clk rising edge when le is asserted the action after a falling edge of le data latch high 1 serial data are transferred to the buffers global latch high 2 or 3 buffer data are transferred to the comparators read configuration high 4 or 5 move out ?configuration register? to the shift register enable ?error detection? high 6 or 7 detect the status of each output?s led read ?error status code? high 8 or 9 move out ?error status code? of 16 outputs to the shift registers write configuration high 10 or 11 serial data are transferred to the ?configuration register? reset to 16-bit shift register length high 12 or 13 set to 16-bit the shift register length
stp1612pw05 principle of operation doc id 15819 rev 4 15/35 figure 6. timing diagram $ata,atch 'lobal,atch 2ead#onfiguration 7rite#onfiguration ,% 3$/ #,+ 3$) 0revious$ata . . . $ $ $ .ext$ata $ $ $ $ $ $ $ $ $ $ $ $ $ -3" $ $ $ ,% #,+ 3$) 3$/ . . . 0revious$ata $ $ $ $ $ $ .ext$ata $ $ $ $ $ $ $ $ $ $ $ $ $ -3" ,% #,+ 3$/ 0revious$ata . . . . . . . . . & % $ # " ! ,% 3$/ #,+ 3$) 0revious$ata . . . .ext$ata & % $ # " ! & % $
definition of configuration register stp1612pw05 16/35 doc id 15819 rev 4 7 definition of configuration register configuration register default value msb lsb fedcba9876543210 msb lsb fedcba9876543210 x 0 1 11 1 8?b10101011 0 0 table 13. configuration register bit attribute definiti on value function f read/write shift register length 0 (default) shift register length 0 = 16-bit,1 = 256-bit e read thermal error flag 0 (default) safe (ok) 1 over temperature (>150 c typ.) d read/write pwm counter: 16-bit or 12-bit 0 (default) to set the gray scale mode (pwm): 0 = 12-bit 1 = 16-bit c read/write pwm counting mode selection 00 64 times of msb (1) 6-bit pwm counting plus once of lsb (1) 6-bit pwm counting 1. please refer to ?setting the pwm counting mode? section. 01 16 times of msb 6-bit pwm counting by 1/4 pwclk plus once of lsb 6-bit pwm counting b 10 4 times of msb 6-bit pwm counting by 1/16 pwclk plus once of lsb 6-bit pwm counting 11 (default) pwm counting a read/write pwm data synchronization mode 0 auto-synchronization 1 (default) manual synchronization 9~2 read/write current gain adjustment 00000000 ~ 11111111 8 ? b10101011 (default) 1 read/write tsd thermal shutdown 0 (default) disable 1 enable (2) the output channel turn off if t tf > 150 c 2. please refer to ?tsd? thermal er ror flag and thermal shutdown ?section. 0 read/write time-out alert of pwclk disconnection 0 (default) enable (3) 3. please refer to ?time-out aler t of pwclk disconnection? section. 1 disable
stp1612pw05 grey scales data loading doc id 15819 rev 4 17/35 8 grey scales data loading the stp1612pw05 is able to manage a gray-scale depth of 12 or 16 bits for each output, exploiting an e-pwm algorithm. the bit d of the configuration register is used to select the grey-scale loading. its value can be set to ?0? for 12 bits or ?1? for 16 bits. by default, d is set to ?0?. loading of the data is performed through the serial input on a dedicated buffer and two different methods can be used. with both methods, the first incoming data packet is relative to the output 15; the following packet is relative to the output 14 and so on up to the output 0. if f=?0?, when a data packet has been loaded, the latch signal (le) must become active for one clk cycle (data latch). when the last data packet, relative to the output 0, has been loaded, the latch signal must be active for tw o clk cycles (global latc h) and all the data will be transferred to the e-pwm registers starting from the msb. if f=?1? all data packets (12 or 16 bits x16) are loaded and then the global latch signal must be active and all the data will be transferred to the e-pwm registers starting from the msb. figure 7. full timing for data loading
setting the pwm gray scale counter stp1612pw05 18/35 doc id 15819 rev 4 9 setting the pwm gray scale counter stp1612pw05 provides a 12-bit or 16-bit pwm color depth. each serial data input will be implemented according to the e-pwm algorithm. 9.1 pwm data synchronization stp1612pw05 defines the different counting algorithms that support e-pwm, technology, (scrambled pwm). with e-pwm, the total pwm cycles can be broken down into msb (most significant bits) and lsb (least significant bits) of gray scale cycles, and the msb information can be dithered across many refresh cycles to achieve overall same high bit resolution. stp1612pw05 also allows changing different counting algorithms and provides the best output linearity when there are fewer transitions of output. figure 8. 12-bit e-pwm operation example pwclk pwclk pwclk pwclk pwclk
stp1612pw05 setting the pw m gray scale counter doc id 15819 rev 4 19/35 9.2 synchronization for pwm counting the data synchronization between the incoming data flow and the output channels is managed through the bit a within the configuration register. if the bit a is set to ?0? the device performs itself the data synchronization: when all the new data are loaded with a ?global latch?, the devi ce wait until all the pwm counter completes the counting cycle before updating them with the new data, at the next clk rising edge. conversely, if bit a is set to ?1? (default), the data synchronization is not performed by the device and is managed by the microcontroller, which has to take care of the data and signals. if this is not done, there might be artefacts on the output image. figure 9. synchronization for pwm counting figure 10. without synchronization for pwm counting clk pwclk clk pwclk
error detection conditions stp1612pw05 20/35 doc id 15819 rev 4 10 error detection conditions the stp1612pw05 can detect open channels (od) and led short-circuits (sd). the detection circuitry performs open- and shor t-circuit detection simultaneously and the image quality will not be impacted since th e test duration is short (0.5 s typ). to perform the open-circuit, short-circuit error detection a channel must be on, the command ?enable error detection? starts the detection. after 0.5 s (typ) the command ?read error status code? allows to get the status from the serial output (sdo). note: where: i o = the output current programmed by the r ext , i odec = the detected output current in detection mode figure 11. detection circuit table 14. detection conditions (v dd = 3.3 to 5 v temp. range -40 to 125 c) sw-1 or sw-3b open line or output short to gnd detected ==> i odec 0.5 x i o sw-2 or sw-3a short on led or short to v-led detected ==> v o 2.3 v 16 stp1612pw05
stp1612pw05 setting output current doc id 15819 rev 4 21/35 11 setting output current the output current (i out ) is set by an external resistor, r ext . it is calculated from the equation: v r-ext = 1.24 x g; i out = (v r-ext /r ext ) x 560 whereas r ext is the resistance of the external re sistor connected to r-ext terminal and v r-ext is its voltage. g is the digital current gain, which is set by the bit9 ? bit2 of the configuration register. the default value of g is 1. for your information, the output current is about 20 ma when r ext = 34.70 k and 10 ma when r ext = 69.6 k if g is set to default value 1. the formula and setting for g are described in next section. figure 12. rext vs output current table 15. rext vs output current (1) 1. t a = 25 c, v dd = 3.3 v; 5.0 v, v led = 3.0 v, v drop = 1.5 v, hc = 0101011 (default) iout (ma) rext (k ) 3 238.2 5 142.2 10 69.6 20 34.70 30 22.94 50 13.72 60 11.40 80 8.63 0 25 50 75 100 125 150 175 200 225 250 275 3 5 10 20 30 50 60 80 iout (ma) rext (kohm)
current gain adjustment stp1612pw05 22/35 doc id 15819 rev 4 12 current gain adjustment the bit 9 to bit 2 of the configuration register set the gain of output current, i.e., g. being 8- bit in total, ranging from 8?b00000000 to 8?b11111111, these bits allow the user to set the output current gain up to 256 levels. these bits can be further defined in the configuration register as follows: configuration register 1. bit 9 is hc bit. the setting is in the low current range when hc=0, and in the high current range when hc=1. 2. bit 8 to bit 2 are da6 ~ da0. the relationship between these bits and current gain g is: hc = 1, d = (256g-128)/3 hc = 0, d = (1024g-128)/3 and d in the above decimal numeration can be converted to its equivalent in binary form by the following equation: d = da6x2 6 + da5x2 5 + da4x2 4 + da3x2 3 + da2x2 2 + da1x2 1 + da0x2 0 in other words, these bits can be looked as a floating number with 1-bit exponent hc and 7- bit mantissa da6~da0. figure 13. gain vs da6 - da0 msb lsb fedcba9876543210 ------hcda6da5da4da3da2da1da0--
stp1612pw05 delay time of staggered output doc id 15819 rev 4 23/35 for example, hc = 1, g = 1.25, d = (256x1.25-128)/3 = 64 the d in binary form would be: d = 64 = 1x2 6 +0x2 5 +0x2 4 +0x2 3 +0x2 2 +0x2 1 +0x2 0 the bit 9 to bit 2 of the configuration register are set to 8?b1100,0000. 13 delay time of staggered output this feature prevents large inrush current from the power line and reduces the bypass capacitors. the outputs are organized in four groups ou t4n, out4n+1, outn4+2, out4n+3 and each group has 40 ns delay between the previous one. e.g.: out4n has no delay, outn4+1 has 40ns delay, outn4+2 has 80ns delay, outn4+3 has 120 ns delay. 14 thermal protection thermal flag provides an indication about the status of the junction temperature. when the junction temperature reaches 150 c the bit e of the configuration register is set to ?1?, signaling dangerous operating condition. this flag is useful when thermal shutdown function is disabled. the thermal shutdown function, if activated by configuration register, turns-off all output channels if the junction exceeds 150 c. as soon as the junction temperature is below 140 c the outputs channels will be turned on. in thermal shutdown mode, the digital core is active and data flow is guaranteed.
time-out alert of gclk disconnection stp1612pw05 24/35 doc id 15819 rev 4 15 time-out alert of gclk disconnection when the pwclk signal is disconnected for arou nd 1 second, a ll output ports will be turned off automatically. this function will protect the led display system from staying on indefinitely and prevent excessive current from damaging the power system. the default is set to ?enable? when bit ?0? is 0. when the pwclk is active again and new serial data are moved in, the driver resumes to work after resetting the internal counters and comparators. figure 14. time-out alert application scheme pwclk 500k stp1612pw05 stp1612pw05 stp1612pw05 stp1612pw05
stp1612pw05 package mechanical data doc id 15819 rev 4 25/35 16 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack is an st trademark. table 16. tssop24 mechanical data dim. mm. inch min. typ max. min. typ. max. a 1.1 0.043 a1 0.05 0.15 0.002 0.006 a2 0.9 0.035 b 0.19 0.30 0.0075 0.0118 c 0.09 0.20 0.0035 0.0079 d 7.7 7.9 0.303 0.311 e 4.3 4.5 0.169 0.177 e 0.65 bsc 0.0256 bsc h 6.25 6.5 0.246 0.256 k 0 8 0 8 l 0.50 0.70 0.020 0.028 figure 15. tssop24 package dimensions
package mechanical data stp1612pw05 26/35 doc id 15819 rev 4 table 17. tssop24 tape and reel dim. mm. inch min. typ max. min. typ. max. a - 330 - 12.992 c 12.8 - 13.2 0.504 - 0.519 d 20.2 - 0.795 - n 60 - 2.362 - t - 22.4 - 0.882 ao 6.8 - 7 0.268 - 0.276 bo 8.2 - 8.4 0.323 - 0.331 ko 1.7 - 1.9 0.067 - 0.075 po 3.9 - 4.1 0.153 - 0.161 p 11.9 - 12.1 0.468 - 0.476 figure 16. tssop24 reel dimensions
stp1612pw05 package mechanical data doc id 15819 rev 4 27/35 table 18. so-24 mechanical data dim. mm. inch min. typ max. min. typ. max. a 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 c 0.5 0.020 c1 45(typ.) d 15.20 15.60 0.598 0.614 e 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 13.97 0.550 f 7.40 7.60 0.291 0.300 l 0.50 1.27 0.020 0.050 s (max.) 8
package mechanical data stp1612pw05 28/35 doc id 15819 rev 4 figure 17. so-24 package dimensions
stp1612pw05 package mechanical data doc id 15819 rev 4 29/35 table 19. so-24 tape and reel dim. mm. inch min. typ max. min. typ. max. a - 330 - 12.992 c 12.8 - 13.2 0.504 - 0.519 d 20.2 - 0.795 - n 60 - 2.362 - t - 30.4 - 1.197 ao 10.8 - 11.0 0.425 - 0.433 bo 15.7 - 15.9 0.618 - 0.626 ko 2.9 - 3.1 0.114 - 0.122 po 3.9 - 4.1 0.153 - 0.161 p 11.9 - 12.1 0.468 - 0.476 figure 18. so-24 reel dimensions
package mechanical data stp1612pw05 30/35 doc id 15819 rev 4 table 20. tssop24 exposed pad dim. mm inch min. typ. max. min. typ. max. a 1.2 0.047 a1 0.15 0.004 0.006 a2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 d 7.7 7.8 7.9 0.303 0.307 0.311 d1 4.7 5.0 5.3 0.185 0.197 0.209 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4.3 4.4 4.5 0.169 0.173 0.177 e2 2.9 3.2 3.5 0.114 0.126 0.138 e 0.65 0.0256 k 0 8 0 8 l 0.45 0.60 0.75 0.018 0.024 0.030 figure 19. tssop24 package dimensions
stp1612pw05 package mechanical data doc id 15819 rev 4 31/35 table 21. qfn24 (4x4) mechanical data dim. mm. mils min. typ max. min. typ. max. a 1.00 39.4 a1 0.00 0.05 0.0 2.0 b 0.18 0.30 7.1 11.8 d 3.9 4.1 153.5 161.4 d2 2.6 2.8 76.8 88.6 e 3.9 4.1 153.5 161.4 e2 2.6 2.8 76.8 88.6 e 0.50 19.7 l 0.40 0.60 15.7 23.6
package mechanical data stp1612pw05 32/35 doc id 15819 rev 4 figure 20. qfn24 (4x4) mechanical drawing
stp1612pw05 package mechanical data doc id 15819 rev 4 33/35 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 99 101 3.898 3.976 t 14.4 0.567 ao 4.35 0.171 bo 4.35 0.171 ko 1.1 0.043 po 4 0.157 p 8 0.315 tape & reel qfnxx/dfnxx (4x4) mechanical data
revision history stp1612pw05 34/35 doc id 15819 rev 4 17 revision history table 22. document revision history date revision changes 17-jun-2009 1 initial release. 10-aug-2009 2 updated section 9.2 on page 19 and table 12 on page 14 29-oct-2009 3 updated: figure 2 on page 6 and table 21 on page 31 added: figure 14 on page 24 18-dec-2009 4 updated section 11 on page 21
stp1612pw05 doc id 15819 rev 4 35/35 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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