unisonic technologies co., ut912d cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2011 unisonic technologies co., ltd qw-r502-044.b decoders for remote controller ? description the utc ut912d of cmos lsis for remote control system applications are paired with utc ut912e (refer to the encoder/decoder cross reference table) and is capable of decoding information which consists of n address bits and 12-n data bits. for proper operation, a pair of encoder/decoder with the same number of addresses and data format should be chosen. the utc ut912d also is arranged to provide 8 address bits and 4 data bits. the decoders receive serial addresses and data from a programmed utc ut912e of encoders that are transmitted together with the header bits by a rf or an infrared transmission medium upon receipt of a trigger signal. if no error or unmatched codes are found, the input data codes are decoded and then transferred to the output pins. the v t pin also goes high to indicate a valid transmission. ? features * pair with utc ut912e * operating voltage: 2.4v ~ 12v * low power and high noise immunity cmos technology * low standby current * built-in oscillator needs only 5% resistor * binary address setting * received codes are checked 3 times * capable of decoding 12 bits of information * address/data number combination: 8 address bits and 4 data bits * vaild transmission indicator * minimal external components dip-18 sop-20 ? ordering information ordering number lead free halogen free package packing ut912dl-d18-t ut912dg-d18-t dip-18 tube ut912dl-s20-r ut912dg-s20-r sop-20 tape reel ut912dl-s20-t UT912DG-S20-T sop-20 tube
ut912d cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r502-044.b ? encoder/decorder cross reference table package decoder part no. data pins address pins v t pair encoder encoder decoder utc ut912d 4 8 utc ut912e dip-14/18 sop-16/ 20 dip-18 sop-20 ? pin configuration 1 2 3 4 5 6 7 14 13 12 11 10 9 8 v dd v t osc1 osc2 v ss a7 a0 a1 a2 a3 a4 a5 a6 1 2 3 4 5 6 7 14 13 12 11 10 9 8 nc v dd osc1 osc2 din d11 a0 a1 a2 a3 a4 a5 a6 dip-18 15 16 d10 a7 sop-20 15 16 17 18 din d11 d10 d9 d8 nc v ss d8 d9 v t 17 18 19 20 ? pin description pin name i/o internal connection description a0 ~ a7 i nmos transmission gate input pins for address a0 ~ a7 setting, these pins can be externally set to v ss or left open. d8 ~ d11 o cmos out output data pins, power-on state is low. din i cmos in seri al data input pin v t o cmos out valid tran smission, active high osc1 i oscillator oscillator input pin osc2 o oscillator oscillator output pin v ss negative power supply, (gnd) v dd positive power supply
ut912d cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r502-044.b ? block diagram
ut912d cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r502-044.b ? absolute maximum ratings parameter symbol ratings unit supply voltage v dd -0.3 ~ +13 v input voltage v in vss-0.3 ~ v dd +0.3 v operating temperature t opr -20 ~ +85 storage temperature t stg -40 ~ +150 note:absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? electrical characteristics (ta=25 , v dd =5v, unless otherwise specified.) parameter symbol test conditions min typ max unit operating voltage v opr 2.4 5 12 v v dd =5v 0.1 1 standby current i stn-by oscillator stops v dd =12v 2 4 a operating current i opr no load, f osc =150khz, v dd =5v 159 400 a v oh =4.5v (source) -1 -1.99 data output current (d8~d11) i dout v dd =5v v ol =0.5v (sink) 1 1.9 ma v oh =4.5v (source) -1 -1.564 v t output current i vt v dd =5v v ol =0.5v (sink) 1 1.53 ma high v ih 3.5 5 v input voltage low v il 0 1 v oscillator frequency f osc r osc =51k , v dd =5v 149 khz
ut912d cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r502-044.b ? operation flowchart the oscillator is disabled in the standby state and activate d when a logic ?high? signal applies to the din pin. that is to say, the din should be k ept low if there is no signal input.
ut912d cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r502-044.b ? functional description operation the utc ut912d offers different packages by various combinations of addresses and data pins to pair with the utc ut912e . the decoders receive data that are transmitted by an encoder and interpret the first n bits of code period as addresses and the last 12-n bits as data, where n is the address code number. a signal on the din pin activates the oscillator, which in turn decodes the in coming address and data. the decoders will then check the received address three times continuously. if the received address codes all match the contents of the decoder-s local address, the 12-n bits of data are de coded to activate the output pins and the v t pin is set high to indicate a valid transmission. this will last unless the address code is incorrect or no signal is received. the output of the v t pin is high only when the transmission is valid. otherwise it is always low. decoder timing address/data sequence the following provides the address/da ta sequence table for various models of the utc ut912d. the correct device should be selected according to the individual address and data requirements. bits 0 1 2 3 4 5 6 7 8 9 10 11 address/ data a0 a1 a2 a3 a4 a5 a6 a7 d8 d9 d10 d11
ut912d cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r502-044.b ? application circuits ? approximate internal connection circuits nmos transmission gate cmos out cmos in oscillator en osc1 osc2
ut912d cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r502-044.b ? oscillator frequency vs supply voltage 2 3 456 7 8 91011 12 13 v dd (vdc) 0.25 0.50 (100khz) 1.00 2.00 3.00 3.50 4.00 fosc (scale) 27k ? 2.50 1.50 30k ? 33k ? 36k ? 39k ? 43k ? 47k ? 51k ? 56k ? 62k ? 68k ? 75k ? 82k ? 100k ? 120k ? 150k ? 180k ? 220k ? rosc ( ? ) note: the recommended oscillator frequency is f oscd (decoder) 50 f osce (utc ut912e encoder) utc assum es no responsibility for equipm ent failures that result from using products at values that exceed, even m om entarily, rated values (such as m axim um ratings, operating condition ranges, or other param eters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or system s where m alfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the inform ation presented in this docum ent does not form part of any quotation or contract, is believed to be accurate and reliable and m ay be changed without notice.
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