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silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 1 infrared remote control transmitter description the SC50462 is a remote control transmitter utilizing cmos technology specially designed for use on infrared applications. it has 64 functions and a total of 76 commands can be transmitted. housed in 24 pins dip package, SC50462 has 2 address bits. features * high performance cmos technology * low power consumption * least external components. * up to 76 instructions * double key operation is possible. applications * television remote control transmitter * video cassette recorder(vcr) remote control transmitter sop-24 sdip-24 ordering information SC50462 SC50462s sdip-24 package sop-24 package block diagram key encoder scan signal generating circuit oscillation circuit output buffer code modulator timing generator instruction decoder 15 13 14 16 17 18 19 20 7 5 6 8 9 10 11 12 2 3 23 4 21 22 24 1 i1 i2 i3 i4 i5 i6 i7 i7 s1 s2 s3 s4 s5 s6 s7 s8 osci osco out cntr c4 c5 vcc vss
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 2 pin configuration SC50462 15 16 14 12 13 2 1 3 5 4 6 7 8 9 10 11 19 20 18 17 23 24 22 21 vss osci osco cntr s1 s2 s3 s4 s5 s6 s7 s8 i1 i2 i3 i4 i5 i6 i7 i8 c4 c5 out vcc absolute maximum ratings (ta=25 c) characteristic symbol value unit supply voltage v cc -0.3 ~ 5.5 v input voltage v in vss-0.3v ~ v cc +0.3v v output voltage v out vss ~ v cc v power dissipation p d 300 mw operating temperature topr -10 ~ +70 c storage temperature tstg -40 ~ +125 c electrical characteristics (tamb=25 c v cc =3.0v,vss=0,unless otherwise specified) parameter symbol test conditions min typ max unit operating supply voltage v cc ta=20 ~ 70 c 1.5 3 5 v operating supply current i cc1 fosc=455khz 0.3 ma stand-by current i cc2 1 a pull-up resistor(i1~i8) rup 100 250 400 k ? pull-up resistor( 4 c , 5 c ) rup 200 350 500 k ? output current(s1~s8) i ol v ol =1.2v -0.2 ma high level output current( out ) i oh v oh =2v 5 ma low level output current( out ) i ol v ol =1v -3 ma high level output current( cntr ) i oh v oh =2v 1 ma low level output current( cntr ) i ol v ol =1v -3 ma
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 3 pin description pin no. pin name input/output description 1,24 vss,vcc power power supply: vcc=3.0v,vss=0v 2,3 osci,osco i/o oscillator input/output pin, 455 or 480khz crystal is connected between these pins. 4 cntr o transmitting indicator. an led and resistor are connected from thispintovcc. 5~12 s1~s8 o key scan signal output pins. 13~20 i1~i8 i key scan signal input pins. 21,22 c4 c5 , i custom code 23 out o modulation pin functional description SC50462 is a sending signal ic on infrared remote control. consisting of timing generating circuit, scan signal generating circuit, key input encoder, instruction decoder, custom code circuit, code encoder, and output buffer. it has 8*8 key matrix input and custom code with 16 bit pcm which shows 76 instructions.76instruction are devided in 64 one shot signal and 12 2-shot signal. when input signal(i1~i8) and/or in combination with the scan signals(s1~s8) are activated, SC50462 checks the id and the custom code bits-- 4 c and 5 c --setting before finally sending out the remote control signal. 1. cntr output the cntr pin is the led transmission indicator. this means that whenever a valid transmission is sent, the led lights up. the cntr output becomes ?l? in the 7 th pulse-rising and ?h? in the 17 th pulse-rising. c0 c1 c2 c3 c4 c5 c7 d0 d1 d2 d3 d4 d5 d6 d7 c6 7th 17th one word out cntr next frame 44ms or 46.4ms note: oscillator frequency=480 or 455khz
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 4 2. oscillating circuit an oscillator circuit may be constructed by using a 480khz or 455khz crystal resonator and two capacitors. please refer to the following diagram. the carrier frequency transmitted is 40khz or 37.9khz.unless any legal key input is activated, the oscillation is automatically stopped. thus ,power consumption is considerably reduced. osci osco 480khz/ 455khz 200pf 200pf SC50462 2 3 3. key input a total of 64 keys may be connected by input pins(i1~i8) and output pins(s1~s8) to form an 8x8 key matrix. double key operation is possible for only one of the keys?sw25~sw28 in combination with any one of the keys ? sw11~sw13. any other key combination are regards as illegal and will not generate any activity. thus, only the following key combinations may be used for the doubled key operation: s1 s2 s3 s4 s5 s6 s7 s8 i8 i7 i6 i5 i4 i3 i2 i1 sw11 sw12 sw13 sw25 sw26 sw27 sw28 sw25 and sw11 sw25 and sw12 sw25 and sw13 sw26 and sw11 sw26 and sw12 sw26 and sw13 sw27 and sw11 sw27 and sw12 sw27 and sw13 sw28 and sw11 sw28 and sw12 sw28 and sw13 note: SC50462 permits two keys function but only ? ? key are allowed. when you push one key of sw11/12/13, you can push with another key of sw25/26/27/28. otherwise, other conditions are illegal.
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 5 4. transmission code the transmission code consists of 16 bits, namely: 8 bits custom code(c0~c7 ) and 8 bits data code (d0~d7). please refer to the table below: c0 c1 c2 c3 c4 c5 c6 c7 d0 d1 d2 d3 d4 d5 d6 d7 custom code data code one frame of the transmission code if a single shot key is depressed, data codes?d6 and d7 will be given the value of (0,0).please refer to the table1.if a valid double key operation is performed, the data codes will receive the values described in table 2. data scan output d0 d1 d2 octal display s1 0 0 0 0 s2 1 0 0 1 s3 0 1 0 2 s4 1 1 0 3 s5 0 0 1 4 s6 1 0 1 5 s7 0 1 1 6 s8 1 1 1 7 data key input d3 d4 d5 octal display i1 0 0 0 0 i2 1 0 0 1 i3 0 1 0 2 i4 1 1 0 3 i5 0 0 1 4 i6 1 0 1 5 i7 0 1 1 6 i8 1 1 1 7 table 1: key matrix/code
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 6 data code octal display scan output d0 d1 d2 d3 d4 d5 d6 d7 d0~d2 d3~d5 d6~d7 s5/i2(sw25) 00110010 4 1 1 s6/i2(sw26) 10110010 5 1 1 s7/i2(sw27) 01110010 6 1 1 s1/i1 (sw11) s8/i2(sw28) 11110010 7 1 1 s5/i2(sw25) 00110001 4 1 2 s6/i2(sw26) 10110001 5 1 2 s7/i2(sw27) 01110001 6 1 2 s2/i1 (sw12) s8/i2(sw28) 11110001 7 1 2 s5/i2(sw25) 00110011 4 1 3 s6/i2(sw26) 10110011 5 1 3 s7/i2(sw27) 01110011 6 1 3 s3/i1 (sw13) s8/i2(sw28) 11110011 7 1 3 table 2: double key signal/code 5. custom code SC50462 has a total of 8 bits custom code (c0~c7). custom code bits ?c4 and c5 can be externally selected using the 4 c and 5 c terminals. the 4 c and 5 c pins are inversed; therefore, if the 4 c and 5 c terminals are pulled high, then the custom code bits?c4 and c5 would have the value(0,0). likewise, when pulled low, then c4 and c5 bits will be (1,1),the other customs code bits,namely:c0~c3 and c6,c7 are fixed at (1,1,1,0) and (1,0 ): the waveform of bits are given below: 0.25/0.26ms 1.00/1.05ms 2.00/2.10ms bit "0" bit "1" note: oscillator frequency=480 or 455khz
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 7 6. key on timing when any key is pressed, the output pin-- out continuously generates the waveform described below until the key is released. key on out 1st frame 2nd frame n-th frame 44ms/46.4ms note: oscillator frequency=480 or 455khz 7. carrier waveform the following is the carrier waveform diagram. a bit modulates 10 carrier waveforms. 10 pulses 1bit carrier wave a3a 1/3 duty cycle a= 8.3 s/8.76 s note: oscillator frequency=480 or 455khz
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 8 typical application circuit 15 16 14 12 13 2 1 3 5 4 6 7 8 9 10 11 19 20 18 17 23 24 22 21 vss osci osco cntr s1 s2 s3 s4 s5 s6 s7 s8 i1 i2 i3 i4 i5 i6 i7 i8 c4 c5 out vcc SC50462 47 f 150 1 ir led s8550 +3v 200pf 200pf 480khz/ 455khz 150 led vcc
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 9 chip topography 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 23 24 size: 1.96 x 2.07mm 2 pad coordinates (unit: m) no. symbol x y no. symbol x y 1 p1 -904.75 -122.00 13 p13 906.00 54.50 2 p2 -904.75 -258.25 14 p14 906.00 154.00 3 p3 -904.75 -709.00 15 p15 906.00 362.50 4 p4 -450.25 -851.25 16 p16 906.00 571.00 5 p5 -200.25 -851.25 17 p17 739.00 854.75 6 p6 80.75 -851.25 18 p18 530.50 854.75 7 p7 220.75 -851.25 19 p19 322.00 854.75 8 p8 501.75 -851.25 20 p20 113.50 854.75 9 p9 641.75 -851.25 21 p21 -564.75 854.75 10 p10 906.00 -615.50 22 p22 -773.25 854.75 11 p11 906.00 -475.50 23 p23 -904.75 248.00 12 p12 906.00 -194.50 24 p24 -857.00 12.00 note: the original point of the coordinate is the die center.
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 10 pcb wire layout schematic: transmitting tube output ground line the transmitting tube ground line and ic ground line should layout separated or overstriking ground line. the above ic only use to hint, not to specified. note: * in wire layout, the power filter capacitor should near to ic. * in wire layout, should avoid power line and ground line too long. * recommended infrared transmit unit and ic ground line should layout separated, or overstriking lines. * the emitter of triode connect 1 resistor at least.
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 11 package outline sdip-24-300-2.54 unit: mm 2.54 7.62(300) 15 degree 0.46 0.08 1.27 4.36max 3.00min 0.5 min 0.89max 6.4 0.25 29.72 0.3 0.25 0.05 sop-24-375-1.27 unit: mm 10.2 0.4 7.6 0.3 9.525(375) 15.34 0.25 13.97 1.27 0.40 0.1 3.10max 0.25 0.05
silan semiconductors SC50462 hangzhou silan microelectronics joint-stock co.,ltd rev: 2.1 2002-02-28 12 attach revision history data rev description page 2001.11.08 2.0 2002.02.28 2.1 modify the ?absolute maximum rating ? modify the ?typical application circuit ? add the ?pcb wire layout schematic? modify the ?package outline? 2 8 10 11

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