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tx-2b/rx-2c toy car remote controller with five functions tx-2b sop-16 dip-14 rx-2c dip-16 tx-2bs RX-2CS description the tx-2b/rx-2c is a pair of cmos lsis designed for remote controlled car applications. the tx-2b/rx-2c has five control keys for controlling the motions (i.e. forward, backward, rightward, leftward and the turbo function) of t he remote controlled car. features * wide operating voltage range (v cc =1.8v~5.0v when dc-dc is not used and v cc =1.0v~5.0v when dc-dc is used) * low stand-by current * in order to be used in the low voltage condition, the dc-dc is added in rx-2c; you can decide whether to use dc-dc; the voltage to turn on is 1.0v ; and the voltage to work is 0.8v ; and the output voltage is 3.0v ; * auto-power-off function for tx-2b * few external components are needed ordering information device package tx-2b dip-14-300-2.54 tx-2bs sop-16-225-1.27 rx-2c dip-16-300-2.54 RX-2CS sop-16-225-1.27 block diagram oscillator latch circuit encoding circuit timing generator logic osci osco right left turbo forward backward pc so sc test b gnd v dd fosc hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 1 of 13 13 2 12 11 9 1 14 10 6 8 7 5 4 3 transmitter tx-2b block diagram
tx-2b/rx-2c block diagram (continued) lx si osco osci gnd hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 2 of 13 4 5 3 8 2 right left turbo backward forward v dd 7 11 10 12 6 13 dc-dc decoding circuit timing generator oscillator pla counter amp latch vi1 vi2 16 14 vo1 vo2 15 9 mod 1 receiver rx-2c block diagram absolute maximum ratings characteristics symbol value unit supply voltage v dc 0.3~6.0 v input / output voltage v i/o gnd-0.2~v dd +0.2 v storage temperature t stg -10~60 c operating temperature t opr -25~125 c electrical characteristics 1. tx-2b(v dd =4.5v, f osc =128 khz, t amb =25 c, unless otherwise specified.) characteristics symbol test conditions min. typ. max. unit operating voltage v dd 1.8 4.5 5.0 v low voltage input v il function input pin -- -- 2.3 v stand-by current i stb no input -- -- 3.0 a operating current i dd output without load -- -- 0.4 ma so driving current i drso load=0.7v 20 ma sc driving current i drsc load=0.7v 20 ma pc driving current i drpc load=0.7v 15 ma tolerance of frequency f tolerance rx-2c oscillator 128khz -20 +20 %
tx-2b/rx-2c 2. rx-2c (v dd =4.0v, f osc =128khz, t amb =25 c, dc-dc is not used, unless otherwise specified.) characteristics symbol test conditions min. typ. max. unit operating voltage v dd 1.8 4.5 5.0 v operating current i dd output without load -- -- 1.0 ma driving current i drive load=0.7v 4.5 -- -- ma tolerance of frequency f tolerance tx-2b 128khz -20 +20 % pin configuration pin description 1. tx-2b/tx-2bs pin no. tx-2b tx-2bs symbol description 1 1 right the rightward function will be selected, if this pin is connected to gnd 2 2 test test pin 3 3 gnd negative power supply 4 4 backward the backward function will be sele cted, if this pin is connected to gnd 5 5 forward the forward function will be selected, if this pin is connected to gnd 6 6 turbo the turbo function will be sele cted if this pin is connected to gnd 7 7 sc output pin of the encoding signal with carrier frequency -- 8, 9 nc not connect 8 10 so output pin of the encodi ng signal without carrier frequency 9 11 v dd positive power supply 10 12 pc power control output pin 11 13 osco oscillator output pin 12 14 osci oscillator input pin 13 15 fosc oscillate frequency output 14 16 left the leftward function will be selected, if this pin is connected to gnd hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 3 of 13
tx-2b/rx-2c 2. rx-2c pin no. symbol description 1 vo2 inverter 2 output pin for power amplify 2 gnd negative power supply 3 si input pin of the encoding signal 4 osci oscillator input pin 5 osco oscillator output pin 6 right rightward output pin 7 left leftward output pin 8 lx dc-dc output pin 9 mod output pin (pull up) to decide the forma t of output sign, rx-2c is same with rx2 if the pin is high, and if the pin is low, rx-2c output another sign format. 10 backward backward output pin 11 forward forward output pin 12 turbo turbo output pin 13 v dd positive power supply 14 vi1 inverter 1 input pin for power amplify 15 vo1 inverter 1 output pin for power amplify 16 vi2 inverter 2 input pin for power amplify function description code format 1. encode rule (a).bit forma (w1 is used for function codes, w2 for start codes) 1khz w1 1khz 50% duty cycle w2 500hz 75% duty cycle (b).date format w2 w2 w2 w2 (n) x w1 w2 w2 w2 w2 (n) x w1 w2 w2 w2 w2 w2 w2 w2 w2 1234 12 34 w1 w1 w1 w1 w1 w1 w2 w2 w2 n-th start code function code 1 word w2 n x w1 hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 4 of 13
tx-2b/rx-2c number of function code (n) w1 function key decode result 4 end code 10 forward forward 16 forward & turbo forward 22 turbo turbo 28 turbo & forward & left forward & left 34 turbo & forward & right forward & right 40 backward backward 46 backward & right backward & right 52 backward & left backward & left 58 left left 64 right right 2. encode/decode timing (a) any function key encode output decode output 1st word 2nd word 3rd word 123456 78 9ms 9ms end code (b) t (n) w1 8ms 1ms si decode output t=17ms+(nw1)x1ms 8ms function function key tx-2b command rx-2c,mod=1 command(rx-2c,mod=0) over code over code forward forward forward pulse 50hz 50%duty forward and turbo forward forward and turbo turbo turbo forward and turbo forward and turbo and left forward and left forward and left forward pulse 50hz 50%duty (to be continued) hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 5 of 13
tx-2b/rx-2c (continued) function key tx-2b command rx-2c,mod=1 command(rx-2c,mod=0) forward and turbo and right forward and right forward and right forward pulse (50hz 50%duty) backward backward backward backward pulse 50hz 50%duty backward and right backward and right backward and right backward pulse 50hz 50%duty backward and left backward and left backward and left backward pulse 50hz 50%duty left left left right right right note: when a key is low voltage, it is an input key. , high voltage format is used when there is no output format. test circuit the oscillator frequency of tx-2b and rx-2c is 116 ~140 khz 100 f typical application circuit transmitter (tx-2b f osc =116~140khz) hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 6 of 13
tx-2b/rx-2c receiver i (rx-2c f osc =128 khz) note:1. mod=1(mod pin opens) 2. no using dc-dc converter because of higher supply voltage 3. two grade shift gears are realized. hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 7 of 13
tx-2b/rx-2c receiver ii (rx-2c fosc=116~140 khz) note:1. mod=0(pulled low) 2. using dc-dc converter because of low supply voltage 3. two grade shift gears are realized. hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 8 of 13
tx-2b/rx-2c infrared application circuit transmitter (tx-2b f osc =114 khz) receiver (rx-2c f osc =114 khz) hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 9 of 13
tx-2b/rx-2c package outline dip-14-300-2.54 unit: mm 2.54 hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 10 of 13 15 degree 0.46 19.55 0.3 1.52 0.5min 2.40max sop-14-225-1.27 unit: mm 1.27 0 7 0.20 0.05 + - 0.02 8.81 0.20 0.40 6.0 0.4 1.80max 5.72 7.62 0.60 0.20 0.10 0.20 3.9 0.2
tx-2b/rx-2c package outline (continued) dip-16-300-2.54 unit: mm sop-16-225-1.27 unit: mm hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 11 of 13
tx-2b/rx-2c mos devices operate notes: electrostatic charges may exist in many things. please ta ke following preventive measures to prevent effectively the mos electric circuit as a result of the damage which is caused by discharge: z the operator must put on wrist strap which should be earthed to against electrostatic. z equipment cases should be earthed. ? z all tools used during assembly, including soldering tools and solder baths, must be earthed. z mos devices should be packed in antistatic/conductive containers for transportation. note silan reserves the right to make changes without notice in this specification for the improvement of the design and performance . silan will supply the best possible product for customers. hangzhou silan microelectronics co.,ltd rev:1.1 2008.06.12 http: www.silan.com.cn page 12 of 13

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