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AMG-SO204 optical switch ic 1. functional description of the AMG-SO204 the AMG-SO204 is a fully integrated optical receiver for optical switch or data transmission applications. it is an integrated light barrier receiver/transmitter front-end ic to be used with external receiving and emitting diodes. the ic consists of a current-to-voltage converter, a variable-gain amplifier, a 10-bit adc, a logic block, two bandgap reference voltage cells, one 1.8v, two 2.5v, and one 3.3v regulator. the emitting diode is controlled by the digital block of the ic, its light signal is received by the receiving photo diode. the resulting input current signal of the ic, is converted into a voltage signal by the current to voltage converter and then amplified. the gain of the amplifier can be set to six predefined levels. the ic's adc samples and converts the gained signal synchronously with the emitting diode's signal. the signal values are processed by the logic block which allows for variable object detection threshold values, adjustable light signal timing, and digital signal filtering. the digital block can be configured and monitored through an asynchronous interface. an eight digit, 7-segment display can be driven by the AMG-SO204 whose value is set through the uart interface. the ic requires external reset and 20mhz clock signal to operate. 2. features ? specialized photo diode receiver front-end in cmos technology ? 4.5v to 6.5v supply voltage range ? on-chip 3.3v linear voltage regulator supporting off-chip electronics ? separate on-chip analog and digital core on-chip 2.5v linear voltage regulators ? on-chip 1.8v adc reference voltage regulator ? internal current-to-voltage converter with modifiable trans resistance ? support of an external current-to-voltage converter by disabling the internal one ? 6 step variable gain amplifier with matched compensation for increased dynamic range ? pwm-adjustable transmit-led signal strength ? adjustable transmit-led timing ? adjustable digital signal filtering ? integrated 8 digit 7-segment led driver ? 625kbit/s uart interface ? low power consumption 3. application the AMG-SO204 is suitable for optical switch applications (i.e. light barriers) and optical data transmission applications. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 1 of 30
AMG-SO204 optical switch ic 3.1. example application drawing 3.2. application notes in preparation AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 2 of 30 figure 1 : optical switch. 4.5-6.5v supply rx tx v d d i n c l k r e s i n AMG-SO204 g n d d g n d a c b 3 v 3 v d d d v d d a v r e f l i g h t o u t l i g h t c u r r . i n r e f e x t c b g a i n v g a o u t 12-30v gnd c o m t x d c o m r x d c p u t x d c p u r x d mcu r o w [ 7 : 0 ] 8x7 segment led s e g [ 7 : 0 ] r f e x t o u t [ 0 ] e x t o u t [ 1 ] e x t c o v e r 2x external output n p n extinp in1 out1 out2
AMG-SO204 optical switch ic table of contents 1.functional description of the AMG-SO204 ............................................................................ 1 2.features ................................................................................................................................. 1 3.application ............................................................................................................................. 1 3.1.example application drawing ................................................................................................... 2 3.2.application notes (optional) ..................................................................................................... 2 4.block diagram ....................................................................................................................... 5 5.block descriptions ................................................................................................................. 5 5.1.current-to-voltage converter (oa1) ........................................................................................ 5 5.2.variable gain amplifier (oa2) .................................................................................................. 5 5.3.unity gain buffer (oa3) ........................................................................................................... 6 5.4.adc block ................................................................................................................................ 6 5.5.i/o block ................................................................................................................................... 6 5.6.logic block ............................................................................................................................... 6 figure 3 logic blocks ..................................................................................................................... 6 6.pinning / pad coordinates ..................................................................................................... 7 7.absolute maximum ratings ................................................................................................... 9 8.electrical characteristics ...................................................................................................... 10 8.1.operational range ................................................................................................................. 10 8.2.dc characteristics ................................................................................................................. 10 8.3.ac characteristics .................................................................................................................. 10 9.application ........................................................................................................................... 14 9.1.example application circuit(s) ............................................................................................... 14 10.register description ........................................................................................................... 18 10.1.write registers ..................................................................................................................... 18 10.2.read registers ..................................................................................................................... 23 11.serial interface ................................................................................................................... 24 12.led display driver ............................................................................................................. 25 13.supply block ...................................................................................................................... 26 14.ic-package ........................................................................................................................ 28 15.ic-marking ......................................................................................................................... 28 16.ordering information .......................................................................................................... 29 17.notes and cautions ........................................................................................................... 29 17.1.esd protection ..................................................................................................................... 29 17.2.storage conditions ................................................................................................................ 29 AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 3 of 30
AMG-SO204 optical switch ic 18.disclaimer .......................................................................................................................... 29 19.contact information ............................................................................................................ 30 AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 4 of 30
AMG-SO204 optical switch ic 4. block diagram 5. block descriptions 5.1. current-to-voltage converter (oa1) the converter is built around operational amplifier oa1. its trans resistance is defined by the resistance of an off-chip resistor connected between the pins in and rf of the ic. the dc voltage applied to the non-inverting input of oa1, which is about 0.5v, defines the average voltage at the output of the converter. this reference voltage is also available at pin refext of the ic. the current to voltage converter can also be built using an external operational amplifier. in such a case oa1 is disabled by bringing its output to a high-impedance state. this makes it possible for the output of an external operational amplifier to be connected directly to pin rf. it is important to remember that, if an external amplifier is used, the voltage at pin rf must not exceed 2.75v (see section 6). 5.2. variable gain amplifier (oa2) the variable gain amplifier is built around operational amplifier oa2. its gain can be modified using a 3-bit signal gain. the gain can be set to one of six predefined values: 9, 17, 33, 65, 129, and 257v/v. the dc gain of the amplifier is always equal to 1v/v, and the low 3-db frequency is set by an external capacitor connected to pin cbgain. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 5 of 30 figure 2 : block diagram 2.5v bias currents bandgap 2.5v oa2 oa3 oa1en oa1en gain logic block a d c i n t e r f a c e gndd cb3v3 row[7:0] cputxd lightout extout[1:0] comtxd seg[7:0] gndd vddd cpurxd extcover npn gndd vddd comrxd resin gndd vddd extinp inclk oa1 vbg vbg vbg gain supply block vddd gndd cb3v3 en lightcurrent adc1 adc2 adc3 adcx3 vref vdda cb3v3 vdd in rf refext cbgain vgaout gnda gndd signal processing block io block 2 4 4 9 2 1.8v vbg ibias ibias vref vref supply 4.5...6.5v bandgap 3.3v 7,2k
AMG-SO204 optical switch ic 5.3. unity gain buffer (oa3) the cell oa3 is used as a buffer and provides the separation between the output of the vga and the input of the adc block. it ensures short settling times during sampling. 5.4. adc block the adc block consists of three successive approximation (sar) analog to digital converters. it requires a reference voltage signal. the reference voltage (vref) is generated within the ic. to achieve sampling rates of up to 2ms/s three lower throughput adcs are combined into one virtual adc. the digital block controls the individual adcs in such a way that their offsets are compensated for. 5.5. i/o block the i/o block provides an interface between the 2.5v logic core and the 3.3v io voltage. 5.6. logic block the logic block provides digital processing of the sampled signal available at the output of the variable gain amplifier. the built-in logic interface shown in fig. 5 controls the sampling action and proper data transmission between the adc's and the logic block. figure 3 logic blocks AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 6 of 30 adc interface 1 a d c a r b i t e r clk1 res1 tun1 soc1 eoc1 dat1 10 adc interface 2 clk2 res2 tun2 soc2 eoc2 dat2 10 adc interface 3 clk3 res3 tun3 soc3 eoc3 dat3 10 10 adat astart azero atm x110 top inclk resin cpurxd 3 gain oa1enab comrxd comtxd cputxd cpu async. interface 8 8 row seg lightenab lightpwm peripheral blocks transmit lightout extout[1:0] npn extinp extcover digital block functional test mode interface e n c o d e r evport 4 gain 3
AMG-SO204 optical switch ic 6. pinning / pad coordinates pin# symbol description 1 row 1 outputs for driving a 7-segment led display. high level activates a single digit. connect to an npn transistor. 2 row 0 3 seg 4 outputs for driving a 7-segment led display. high level activates a segment of a digit. connect to an npn transistor. 4 seg 3 5 seg 0 6 seg 1 7 seg 6 8 seg 2 9 extout[0] judgment result output port #1 10 extcover overcurrent detection input of external output port, internally pulled-up to 3.3v 11 nc leave unconnected 12 nc leave unconnected 13 nc leave unconnected 14 nc leave unconnected 15 nc leave unconnected 16 nc leave unconnected 17 npn npn/pnp select, internally pulled-up to 3.3v 18 inclk 20mhz clock input 19 comrxd microcontroller receive port for intermodule communication, internally pulled-down to gnd 20 comtxd microcontroller transmit port for intermodule communication 21 cpurxd microcontroller receive port for reading registers, internally pulled- down to gnd 22 cputxd microcontroller transmit port for setting registers 23 extout[1] judgment result output port #2 24 extinp general input port 25 resetinb system reset input port, internally pulled-down to gnd 26 lightcurrent led intensity control 27 lightout led on/off control 28 vdd 6v supply pin 29 cb3v3 output of the 3.3v regulator/3.3v decoupling capacitor pin 30 vddd decoupling capacitor pin for the 2.5v regulator (digital) 31 gndd digital ground pin 32 nc leave unconnected 33 gnda analog ground pin AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 7 of 30
AMG-SO204 optical switch ic pin# symbol description 34 vdda decoupling capacitor pin for the 2.5v regulator (analog) 35 vref decoupling capacitor pin for the 1.8v reference voltage regulator 36 vgaout vga output (test and debug pin) 37 cbgain vga decoupling capacitor pin 38 in current-to-voltage converter input 39 rf current-to-voltage converter output 40 refext 0.5v bias pin for an external cvc / 0.5v bias blocking capacitor 41 row[5] outputs for driving a 7-segment led display. high level activates a single digit. connect to an npn transistor. 42 row[3] 43 row[4] 44 row[7 45 row[6] 46 row[2] 47 seg[5] outputs for driving a 7-segment led display. high level activates a segment of a digit. connect to an npn transistor. 48 seg[7] AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 8 of 30
AMG-SO204 optical switch ic 7. absolute maximum ratings the absolute maximum ratings may not be exceeded under any circumstances. # symbol parameter min max unit 1 v vdd supply voltage -0.3 18 v 2 v rf voltage at pin r f -0.3 2.75 v 3 v clk voltage at pin clk -0.3 5.5 v 4 v i/o input voltages at i/o ports -0.3 5.5 v 5 v esd esd test voltage (human body model) -2 2 kv 6 t stg storage temperature -55 150 c note: AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 9 of 30 figure 4 : AMG-SO204 pin diagram vgaout vref vdda gnda nc gndd vddd cb3v3 vdd 36 35 34 33 32 31 30 29 28 27 26 25 cbgain 37 24 extinp in 38 23 rf 39 22 cputxd refext 40 21 cpurxd row[5] 41 20 comtxd row[3] 42 19 comrxd row[4] 43 18 inclk row[7] 44 17 npn row[6] 45 16 nc row[2] 46 15 nc seg[5] 47 14 nc seg[7] 48 13 nc 1 2 3 4 5 6 7 8 9 10 11 12 row[1] row[0] seg[4] seg[3] seg[0] seg[1] seg[6] seg[2] nc nc light out light current reset inb extout [1] extout [0] ext cover
AMG-SO204 optical switch ic 8. electrical characteristics 8.1. operational range # symbol parameter min max unit 1 v vdd supply voltage 4.5 6.5 v 2 t amb ambient temperature -25 90 c note: 8.2. dc characteristics # symbol parameter min typ max unit 1 i vdd total current consumption 5 6,5 8 ma 2 t startup * startup time 150 ms note: *startup time is defined as the time between applying supply voltage and photo diode current and readiness of the ic for proper operation (exempt reset). 8.3. ac characteristics a) operational amplifier oa1 # symbol parameter min typ max unit 1 a v,0 differential dc gain - 110 - db 2 |v o,i | input offset voltage - 5 - mv 3 |i b | input bias current - <1 - na 4 v cm common mode input voltage 0 - 1.5 v 5 sr slew rate (c l =5pf) - 0,25 - v/s 6 gbw gain-bandwidth product (c l =5pf) - 60 - mhz 7 pm phase margin (c l =5pf) - 65 - 8 e n input-referred noise voltage 3 nv/ hz 9 i n input-referred noise current 1,2 pa/ hz note: AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 10 of 30
AMG-SO204 optical switch ic b) variable gain amplifier (built on oa2) all values are given for cbgain=2.2uf # symbol parameter gain min typ max unit 1 a v,0 dc voltage gain 0 9 v/v 2 1 17 3 2 33 4 3 65 5 4 129 6 5 257 7 |v o,i | input offset voltage - - 5 - mv 8 f l,3db lower 3-db frequency 0 10 hz 9 1 20 10 2 40 11 3 80 12 4 160 13 5 320 14 f h,3db upper 3-db frequency 0 4,5 mhz 15 1 4,5 16 2 4,5 17 3 4,5 18 4 6 19 5 6 AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 11 of 30
AMG-SO204 optical switch ic AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 12 of 30 figure 4 : frequency response of the vga for different gain levels (typical simulation results,cb,gain=2.2uf) figure 3 : steady-state time response of the vga for a typical signal: gain=257v/v, vin=5mv, vref=0.5v, and ton=800ns (typical simulation results)
AMG-SO204 optical switch ic c) adc # symbol parameter min typ max unit 1 n resolution - 10 - bits 2 f s sampling rate 0.1 - 2 ms/s 3 v o,i input offset voltage - - 50 mv 4 dnl differential nonlinearity -0.75 - 0.75 lsb 5 inl integral nonlinearity -2.5 - 2.5 lsb 6 f clk master clock frequency - 32*f s - mhz 7 v vref reference voltage - 1.8 - v 8 vin max input voltage range 0 - v vref v d) reference and supply voltages # symbol parameter min typ max unit 1 v vref 1.8v reference voltage 1.70 1.80 1.90 v 2 v vdda 2.5v analog supply voltage 2.35 2.50 2.65 v 3 v vddd 2.5v digital supply voltage 2.35 2.50 2.65 v 4 v cb3v3 3.3v supply voltage 3.00 3.30 3.60 v AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 13 of 30
AMG-SO204 optical switch ic 9. application the figure below shows the general circuitry. the light line is between rx-diode (see fig. 6 ) and the tx-diode (see fig. 7 ). the AMG-SO204 needs an external 20mhz clock to connect at pin inclk (see fig. 8 ) 9.1. example application circuit(s) AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 14 of 30 figure 5 : example application circuit vddd vref vdda cb3v3 vdd cbgain vgaout gnda gndd 3.3v / 20ma supply 4.5...6.5v 100nf 100nf 100nf 100nf 100nf 100nf in rf refext 100nf AMG-SO204 row[7:0] cputxd lightout extout[1:0] comtxd seg[7:0] cpurxd extcover npn comrxd resin extinp inclk lightcurrent 220pf
AMG-SO204 optical switch ic AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 15 of 30 figure 6 : 'rx circuitry 3pf 100nf 270k rx-diode e.g. s9119 10f 10f 10k 10k 100k in rf figure 7 : 'tx circuitry 100n 20mhz inclk e.g. cfps-39 10k load extcover extout[1:0] 10k 10k 10k 220 lightout light- current 2.2 470 220 10 tx-diode e.g. tn6725a e.g. tn6725a e.g. lse6sf bustxd busrxd from/to another unit 3.3k 100 330 row[7:0] 1k led display (7 segment x 8 digits) seg[7:0] 10k 220 led display (7 segment x 8 digits)
AMG-SO204 optical switch ic AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 16 of 30 figure 8 : external oscillator 100n 20mhz inclk e.g. cfps-39 10k load extcover extout[1:0] 10k 10k 10k 220 lightout light- current 2.2 470 220 10 tx-diode e.g. tn6725a e.g. tn6725a e.g. lse6sf bustxd busrxd from/to another unit 3.3k 100 330 row[7:0] 1k led display (7 segment x 8 digits) seg[7:0] 10k 220 led display (7 segment x 8 digits) figure 9 : segment driver circuitry for led display 100n 20mhz inclk e.g. cfps-39 10k load extcover extout[1:0] 10k 10k 10k 220 lightout light- current 2.2 470 220 10 tx-diode e.g. tn6725a e.g. tn6725a e.g. lse6sf bustxd busrxd from/to another unit 3.3k 100 330 row[7:0] 1k led display (7 segment x 8 digits) seg[7:0] 10k 220 led display (7 segment x 8 digits)
AMG-SO204 optical switch ic if the internal oa1 is disabled (see chapter 5.1 ), an external oa can be connected to rf and refext as shown in fig. 11 . AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 17 of 30 figure 10 : row driver circuitry for led display 100n 20mhz inclk e.g. cfps-39 10k load extcover extout[1:0] 10k 10k 10k 220 lightout light- current 2.2 470 220 10 tx-diode e.g. tn6725a e.g. tn6725a e.g. lse6sf bustxd busrxd from/to another unit 3.3k 100 330 row[7:0] 1k led display (7 segment x 8 digits) seg[7:0] 10k 220 led display (7 segment x 8 digits) figure 11 : external current-to-voltage converter oa1 (intern oa1 is inactive) rf refext 100nf 100nf 100k 3.3v photo- diode oa1 3.3v pc4572
AMG-SO204 optical switch ic 10. register description 10.1. write registers address bit name value reset value* detail 0 0 clm 0 n/a n/a 1 update recmax and recmin with present received value 1 clc 0 n/a n/a 1 clear countval 1 0 etg 0 0 update extout on every emitting cycle 1 update extout at the external trigger input is active 2...1 for future use 0 0 open for future use 1 open for future use AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 18 of 30 figure 12 : external threshold control 100n 20mhz inclk e.g. cfps-39 10k load extcover extout[1:0] 10k 10k 10k 220 lightout light- current 2.2 470 220 10 tx-diode e.g. tn6725a e.g. tn6725a e.g. lse6sf bustxd busrxd from/to another unit 3.3k 100 330 row[7:0] 1k led display (7 segment x 8 digits) seg[7:0] 10k 220 led display (7 segment x 8 digits)
AMG-SO204 optical switch ic address bit name value reset value* detail 2 select trigger input source as the expansion input #1 on the comparator unit 3 select trigger input source as the expansion input #2 on the comparator unit 3 filt 0 0 disable the received light filter 1 enable the received light filter 5...4 filte 0 0 set 1 to the number of eliminating maximum and minimum value in the received light filter 1 set 2 to above 2 set 3 to above 3 set 4 to above 7...6 filta 0 0 set 6 to the number of received light values in the received light filter. the result of received light filter is sum of ((filta - filte)*2+4) times of received data 1 set 8 to above 2 set 10 to above 3 set 12 to above 10..8 gain 0...5 0 set the gain of operational amplifier #2 11 for future use 0 0 open for future use 1 open for future use 12 drk 0 0 turns on extout when the received light value is the inside of between threnlr and threnhr 1 turns on extout when the received light value is the outside of between threnlr and threnhr 13 demt 0 0 enable lightout 1 disable lightout 14 for future use 0 0 open for future use 1 open for future use 15 avg 0 0 open for future use 1 open for future use 2 8...0 emitw 0...511 511 specify the emitter light pulse width. time period is 50ns*(emitw+1). it should be set greater than 15 15...9 ecycle 0...127 127 specify the emitter light cycle. time period is the emitter pulse width(ecycle+1). it should be set greater than 4. display switching noise may affect on the setting value is 5,37,69, or 101 3 8...0 emits 0...511 7 put forward the emitter light pulse. set value that is calculated (emitw-[time period]. 4 13...0 thre1lr 016383 1000 lower and upper threshold levels of extout[0]. turn on when AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 19 of 30
AMG-SO204 optical switch ic address bit name value reset value* detail the received light value is equal 5 13...0 thre1hr 016383 8192 6 13...0 thre2lr 016383 1000 lower and upper threshold levels of extout[1]. turn on when the received light value is equal or greater than thre2lr and equal or less than thre2hr 7 13...0 thre2hr 016383 8192 8 13...0 thre1lf 016383 1000 lower and upper threshold levels of extout[0]. turn off when the received light value is less than thre1lf or greater than thre1hf 9 13...0 thre1hf 016383 8192 10 13...0 thre2lf 016383 1000 lower and upper threshold levels of extout[1]. turn off when the received light value is less than thre2lf or greater than thre2hf 11 13...0 thre2hf 016383 8192 12 13...0 ondly 016383 0 on-delay timer value for extout. time unit is specified by ondbs 15...14 ondbs 0 0 set 1 microsecond to the on-delay timer unit for extout 1 set 10 microsecond to the on-delay timer unit for extout 2 set 100 microsecond to the on-delay timer unit for extout 3 set 1 millisecond to the on-delay timer unit for extout 13 13...0 offdly1 016383 0 off-delay timer value for extout[0]. time unit is specified by offdbs1 15...14 offdbs1 0 0 set 1 microsecond to the off-delay timer unit for extout[0] 1 set 10 microsecond to the off-delay timer unit for extout[0] 2 set 100 microsecond to the off-delay timer unit for extout[0] 3 set 1 millisecond to the off-delay timer unit for extout[0] 14 13...0 offdly2 016383 0 off-delay timer value for extout[1]. time unit is specified by offdbs2 15...14 offdbs2 0 0 set 1 microsecond to the off-delay timer unit for extout[1] 1 set 10 microsecond to the off-delay timer unit for extout[1] 2 set 100 microsecond to the off-delay timer unit for extout[1] 3 set 1 millisecond to the off-delay timer unit for extout[1] 15 0 cnm 0 0 disable the automatic counter clear mode 1 enable the automatic counter clear mode. clear countval when countval is equal or greater than countmch 2...1 cns 0 0 select counter clear source as the external input 1 select counter clear source as the external input on the master unit 2 select counter clear source as the expansion input #1 on the comparator unit 3 select counter clear source as the expansion input #2 on the comparator unit 4...3 onesht bit3=0 0 disable one-shot mode on extout[0] AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 20 of 30
AMG-SO204 optical switch ic address bit name value reset value* detail bit3=1 enable one-shot mode on extout[0] bit4=0 0 disable one-shot mode on extout[1] bit4=1 enable one-shot mode on extout[1] 6...5 o2m 0 0 select extout[1] control to the threshold level mode 1 select extout[1] control to the counter compared output mode 2 select extout[1] control to the inverted output of extout[0] 7 ccen 0 0 disable the external counter clear input 1 enable the external counter clear input 8 oih1 0 0 enable the on-delay timer of extout[0] 1 disable the on-delay timer of extout[0] whatever ondly is set 9 oih2 0 0 enable the on-delay timer of extout[1] 1 disable the on-delay timer of extout[1] whatever ondly is set 10 dim 0 0 set 7/8 duty ratio to row[30] and 2/8 duty ratio to row[74] 1 set 1/8 duty ratio to row[70] 12...1 1 onena bit11=0 0 set the continuous one-shot mode for extout[0] bit11=1 set the triggered one-shot mode for extout[0] bit12=0 0 set the continuous one-shot mode for extout[1] bit12=1 set the triggered one-shot mode for extout[1] 16 6...0 dispo 0 0 turn off the segments of the rightmost column in the 8-digit led display 1 turn on the rightmost column in the 8-digit led display 7 evf 0 0 open for future use 1 open for future use 14...8 disp1 0 0 turn off the 7th column in the 8-digit led display 1 turn on the 7th column in the 8-digit led display 17 6...0 disp2 0 0 turn off the 6th column in the 8-digit led display 1 turn on the 6th column in the 8-digit led display 14...8 disp3 0 0 turn off the 5th column in the 8-digit led display 1 turn on the 5th column in the 8-digit led display 18 6...0 disp4 0 0 turn off the 4th column in the 8-digit led display 1 turn on the 4th column in the 8-digit led display 7 d80 0 0 turn off the dot segment of row 2 1 turn on the dot segment of row 2 AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 21 of 30
AMG-SO204 optical switch ic address bit name value reset value* detail 14...8 disp5 0 0 turn off the 3rd column in the 8-digit led display 1 turn on the 3rd column in the 8-digit led display 15 d81 0 0 turn off the dot segment of row 3 1 turn on the dot segment of row 3 19 6...0 disp6 0 0 turn off the 2nd column in the 8-digit led display 1 turn on the 2nd column in the 8-digit led display 7 d82 0 0 turn off the dot segment of row 4 1 turn on the dot segment of row 4 14...8 disp7 0 0 turn off the leftmost column in the 8-digit led display 1 turn on the leftmost column in the 8-digit led display 15 d83 0 0 turn off the dot segment of row 5 1 turn on the dot segment of row 5 20 7...0 pwm 0...255 0 the pwm duty ratio of light_current output 14...13 atm bit13=0 0 turn off analog-test-mode bit13=1 turn on analog-test-mode bit14=1 0 trigger digital-test-mode (reset to disable) 21 15...0 countmch 0...65535 6553 5 set value for comparison with the counter * values after por or reset by reset-pin AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 22 of 30
AMG-SO204 optical switch ic 10.2. read registers address bi t name value reset value* detail 0 130 rec data 016383 n/a latest value of the received light 1 130 rec max 016383 n/a maximum value of the received light 2 130 rec min 016383 n/a minimum value of the received light 3 30 for future use 0...15 n/a open for future use 4 for future use 0 n/a open for future use 1 open for future use 5 for future use 0 n/a open for future use 1 open for future use 8...6 for future use 0 n/a open for future use 1 open for future use 0 open for future use 1 open for future use 0 open for future use 1 open for future use 9 ein 0 n/a the external input is inactive (npn = l), active (npn = h) 1 the external input is active (npn = l), inactive (npn = h) 10 npn 0 n/a npn input port is inactive 1 npn input port is active 11 cov 0 n/a extcover input port is inactive 1 extcover input port is active 13...12 jdgsts bit12=0 n/a recdata is the outside of thre1lr and thre1hr bit12=1 recdata is the inside of thre1lr and thre1hr bit13=0 recdata is the outside of thre2lr and thre2hr bit13=1 recdata is the inside of thre2lr and thre2hr 4 15...0 countval 065535 n/a latest value of the counter * values after por or reset by reset-pin AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 23 of 30
AMG-SO204 optical switch ic 11. serial interface all registers are either read-only or write-only (see register map in chapter 10 ). data is received via the pin cpurx and sent via the pin cputx using a 625kbit/s uart, shown in fig. 13 for write and fig. 14 for read. data is sent byte-wise, framed by one start bit and one stop bit. each transfer consists of one address byte followed by two data bytes, the low byte is sent before the high byte. the 7 bit address is contained in the 7 least significant bits of the address byte. for writes the msb is set to 0 for reads to 1. symbol parameter name min typ max unit t bit bit length -5,00% 1/625 5,00% 1/khz table 1 : uart parameters AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 24 of 30 figure 13 : write to so204 cpu-rx start cpu-tx 7 6 0 start stop stop stop start 7 7 6 6 0 0 5 5 5 adress 8 bit to write to a9234 data 8 bit (lsb) to write to a9234 data 8 bit (msb) to write to a9234 t bit 10 ? t bit
AMG-SO204 optical switch ic 12. led display driver an 8 digit 7-segment led display can be connected to the ic via row[7:0], and seg[7:0]. it is controlled via registers 16, 17, 18, 19 (see register map in chapter 10 ). the relationship between segment number and register bit is shown in the figure below. when a segment bit is set the related seg[7:0] pin is set to logic high. one line out of row [7:0] is set to high sequentially to display the value of seg[7:0] for each digit, see fig. 16 for the signal's timing. note: only the dot segments of row 2 through 5 can be set. it must be observed that the flag must be set in the registers normally associated with row 4 through 7. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 25 of 30 figure 14 : read from so204 start 7 6 0 stop 5 cpu-rx cpu-tx start stop stop start 7 7 6 6 0 0 5 5 adress 8 bit to read from a9234 data 8 bit (lsb) to read from a9234 data 8 bit (msb) to read from a9234 t bit 10 ? t bit 2650 ? 2700 ns figure 15 : schematic drawing of numeric 7-segment led seg0 seg6 seg3 seg1 seg2 seg4 seg5 seg7 row0 seg0 => bit 0 / 8 seg1 => bit 1 / 9 seg2 => bit 2 / 10 seg3 => bit 3 / 11 seg4 => bit 4 / 12 seg5 => bit 5 / 13 seg6 => bit 6 / 14 seg6 => bit 6 / 14 seg6 => bit 6 / 14 only the dot segments of row2 C 5 can be set: seg7 => row2 / 3 => bit 7 / 15 (adresse 18) => row4 / 5 => bit 7 / 15 (adresse 19)
AMG-SO204 optical switch ic 13. supply block the supply block consists of 2 bandgap cells, 4 low-drop voltage regulators and 1 bias current generator. it provides the voltages as shown in the table below. name value bandgap 1,24 v cb3v3 3,3 v vdda 2,5 v vddd 2,5 v vref 1,8 v table 2 : provided voltages the bandgap cells are responsible for delivering temperature- and process-independent reference voltages used for biasing other blocks of the AMG-SO204 . these voltages are only AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 26 of 30 figure 16 : timings of 7-segment led control row[0] 5,72 ms 1,7 ms seg[7:0] 6,56 ms 11,48 ms 6,56 ms row[1] row[7] row[6] row[5] row[4] row[3] row[2] t=52,5 ms (19 hz)
AMG-SO204 optical switch ic internal. the use of two bandgaps has been dictated by precision and voltage considerations: the high-voltage bandgap is less precise but can operate under a relatively wide range of supply voltages (4.5v...6.5v), whereas the low-voltage bandgap is more precise but requires an accurate supply voltage of 3.3v. the high voltage bandgap provides the reference voltage for the 3.3v voltage regulator and the low voltage bandgap the reference for the 2.5v and 1.8v voltage regulators. the ic includes four low-drop voltage regulators. the 3.3v regulator lowers the supply voltage to about 3.3v. this regulated voltage is used to supply two on-chip 2.5v regulators, the low- voltage voltage bandgap, the on-chip 1.8v regulator, and any off-chip 3.3v electronics. the two 2.5v regulators supply, independently, the analog and the digital part of the ic and the bias current generator. the use of two virtually identical 2.5v regulators was dictated by the desire to achieve high separation between the (quiet) analog and the (noisy) digital part of the ic. the 1.8v regulator is used to provide the reference voltage for the adc. the voltage regulators whose output voltage are extern available at the pins cb3v3, vdda, vddd and vref and the supply pin vdd needs to be decoupled. the cell bias currents provides a current of about 15ua to each adc. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 27 of 30
AMG-SO204 optical switch ic 14. ic-package tqfp 48 15. ic-marking so204 4 digits date code = 2 digits year + 2 digits work week 8 digits lot number = 2 digits fab process + 4 digits lot number + 1 digit sub lot AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 28 of 30 package: tqfp 7x7 48l figure 17 : package s y m b o l ms-026 n o t e abc square min nom max a 1.00 1.10 1.20 a1 0.05 0.10 0.15 a2 0.95 1.00 1.05 d 9.00 bsc d1 7.00 bsc e 9.00 bsc e1 7.00 bsc n 48 e 0.50 bsc b 0.17 0.22 0.27 b1 0.17 0.20 0.23 tolerance of form and position ccc 0.08 ddd 0.08
AMG-SO204 optical switch ic 16. ordering information AMG-SO204-ilq48t (lqfp48, tube) 17. notes and cautions 17.1. esd protection the requirements for handling electrostatic discharge sensitive devices are described in the jedec standard jesd625-a. please note the following recommendations: ? when handling the device, operators must be grounded by wearing a for the purpose designed grounded wrist strap with at least 1m resistance and direct skin contact. ? operators must at all times wear esd protective shoes or the area should be surrounded by for esd protection intended floor mats. ? opening of the protective esd package that the device is delivered in must only occur at a properly equipped esd workbench. the tape with which the package is held together must be cut with a sharp cutting tool, never pulled or ripped off. ? any unnecessary contact with the device or any unprotected conductive points should be avoided. ? work only with qualified and grounded tools, measuring equipment, casing and workbenches. ? outside properly protected esd-areas the device or any electronic assembly that it may be part of should always be transported in egb/esd shielded packaging. 17.2. storage conditions the AMG-SO204 corresponds to moisture sensitivity classification ml2 , according to jedec standard j-std-020, and should be handled and stored according to j-std-033. 18. disclaimer information given in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties that may result from its use. the values stated in absolute maximum ratings may under no circumstances be exceeded. no warranty is given for use in life support systems or medical equipment without the specific written consent of alpha microelectronics gmbh. for questions regarding the application please contact the publisher. the declared data are only a description of the product. they are not guaranteed properties as defined by law. examples are given without obligations and cannot give rise to any liability. reprinting of this data sheet C or any part of it C is not allowed without the license of the publisher. data sheets are subject to change without any notice. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 29 of 30
AMG-SO204 optical switch ic 19. contact information this data sheet is published by alpha microelectronics gmbh. to order samples or inquire information please contact: alpha microelectronics gmbh im technologiepark 1 15236 frankfurt (oder) germany am.info@alpha-microelectronics.de www.alpha-microelectronics.de +49-335-557-1750 (telephone) +49-335-557-1759 (fax) ? all rights reserved. AMG-SO204 revision: a 29. jul. 2010 ? all rights reserved page 30 of 30

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