rato RT1527 a030324-v1.0 encoder 1 description RT1527 is a one time programmable encoder ut ilizing cmos technology process. RT1527 has a maximum of 20 bits providing up to 1 million codes. it can reduce code collision and unauthorized code scanning possibilities. features 1. cmos technology. 2. low stand by current < 1 a. 3. wide range of operating voltage: vcc = 1.8v ~ 13v. 4. up to 4 data pins. 5. total 1048576 address codes. 6. single resistor oscillator. applications 1. car and motorcycle security system. 2. wireless door bell. 3. home security system. pin out
rato RT1527 a030324-v1.0 encoder 2 pin description symbol description pin i/o osci single resistor oscillator pin. connected r to vcc. 1 i vcc positive power supply. 2 ? gnd ground. 3 ? txd transmission data output pin. 4 o k0 data input with pull-lo w r. active high. 5 i k1 data input with pull-lo w r. active high. 6 i k2 data input with pull-lo w r. active high. 7 i k3 data input with pull-lo w r. active high. 8 i functional description when data pin (k0~k3) set to ?1?, RT1527 will transmit serial data waveform from c0~c19 to d0~d3 by radio frequency (rf) modulation. this can be use in most of the remote control application. data transmission code frame a code frame period is depended on data pi n active period. when data pin is active the code word transmit continuously until da ta pin inactive. format is as follow:
rato RT1527 a030324-v1.0 encoder 3 code word code word consists of full set of serial data format. the combination is as follow: sync. 20 address bits (c0~ c19) 4 data bits (d0~d3) each code word consists of 20 address bits, 4 data bits and a synchronous bit. the transmission sequence is as the diagram shown: sync c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 d0 d1 d2 d3 code bit code bit is the combination of address an d data bits, RT1527 transmit a serial of waveform is consist of code bits and sync. code bit ca n be defined into 2 states: logic low (?0?) and logic high (?1?). each length of code bit is equal to 128 oscillation pulse. please refer to the diagram shown below: sync bit the synchronous bit length is equal to 1024 oscillation pulse.
rato RT1527 a030324-v1.0 encoder 4 example: serial data out transmission address code is : ?3caf0?; data code is : ?1?. data combination table(k3~k0) k3 k2 k1 k0 d3 d2 d1 d0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 1 0 1 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 1 1 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 1 1 0 1 1 1 1 0 1 1 1 0 1 1 1 1 1 1 1 1
rato RT1527 a030324-v1.0 encoder 5 abosolute maximum ratings symbol parameter condition rating unit vcc supply voltage -0.3 ~ 15 v vi input voltage -0.3 ~ vcc +0.3 v vo output voltage -0.3 ~ vcc +0.3 v tst storage temp. -40 ~ 125 j top operating temp. -20 ~ 70 j pdis max. power dissipation vcc=12v 300 mw dc electrical characteristics: symbol parameter condition min. type max. unit vcc operating voltage 1.8 ? 13 v isb stand by current osc stop output unloaded 1 a iop operating current vcc = 12v, osc = 80khz 0.5 1 ma ioh source current vcc = 12v, voh = 6v 3 ma iol skin current vcc = 12v, vol = 6v 3 ma
rato RT1527 a030324-v1.0 encoder 6 oscillation resistance and frequency 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 345678910111213 vcc unit : volt unit : ms 270k 360k 470k 560k 680k 820k 180k 100k osc r t x d
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