unisonic technologies co., ltd ut912e cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2015 unisonic technologies co., ltd qw-r502-022.c encoder for remote controller ? description the utc ut912e of cmos lsis for remote control system applications is capable of encoding information which consists of n address bits and 12-n data bits. each address/data input can be set to one of the two logic states. the programmed addresses/data are transmitted t ogether with the header bits by a rf or an infrared transmission medium upon receipt of a trigger signal. ? features * operating voltage: 2.4v ~ 12v * low power and high noise immunity cmos technology * low standby current (0.1 a (typ.) at v dd =5v) * minimum transmission word (four words) * built-in oscillator needs only 5% resistor * data code has positive polarity * minimal external components dip-14 sop-16 dip-18 sop-20 ? ordering information ordering number lead free halogen free package packing ut912el-d14-t ut912eg-d14-t dip-14 tube - UT912EG-D18-T dip-18 tube - ut912eg-s16-r sop-16 tape reel - ut912eg-s20-r sop-20 tape reel
ut912e cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r502-022.c ? marking packing marking dip-14 dip-18 sop-16 u t c u t 9 1 2 e 12 3 4 5 67 8 9 10 11 12 13 14 15 16 date code l: lead free g: halogen free lot code sop-20
ut912e cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r502-022.c ? pin configuration ? pin description pin name i/o internal connection description a0 ~ a7 nmos transmission gate protection diode input pins for address a0 ~ a7 setting these pins can be externally set to vss or left open ad8 ~ ad11 nmos transmission gate protection diode input pins for address/data ad8 ~ ad11 setting these pins can be externally set to vss or left open dout o cmos out encoder data serial transmission output te cmos in pull-high transmission enable, active low osc1 oscillator 1 oscillator input pin osc2 o oscillator 1 oscillator output pin v ss negative power supply (gnd) v dd positive power supply
ut912e cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r502-022.c ? block diagram osc circuit 12 bit add/data input circuit te a0 a7 ad8 ad11 fosc/3 divider 12 bit add/data decoder data select and driver sync. circuit binary detector v dd vss dout osc2 osc1 te trigger
ut912e cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r502-022.c ? absolute maximum ratings (t a =25c, unless otherwise specified) 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 c storage temperature t stg -40 ~ +150 c ? electrical characteristics (t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit operating voltage v dd 2.4 5 12 v v dd =3v 0.1 1 standby current i stn-by oscillator stops v dd =12v 2 4 a v dd =3v 40 80 operating current i opr no load, fosc=3khz v dd =12v 150 300 a v oh =0.9v dd (source) -1 -1.6 output driver current i dout v dd =5v v ol =0.1v dd (sink) 1 1.6 ma high v ih 0.8v dd v dd v input voltage low v il 0 0.2v dd v oscillator frequency f osc r osc =1.1m ? , v dd =5v 3 khz te pull-high resistance r te v te =0v, v dd =5v 1.5 3 m ?
ut912e cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r502-022.c ? operation flowchart power on standby mode transmission enabled? 4 data words transmitted transmission still enabled no yes yes 4 data words transmitted contiuously no te receied a low signal. te still is held low. te return high.
ut912e cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r502-022.c ? functional description operation the utc ut912e start a cycle of 4-words transmission upon receipt of a transmission enable (te). a completed cycle is showed as below. this cycle will repeat itself as long as the transmission enable is held low. while the transmission enable returns high the encoder out put completes its final cycle and then stops. <1 word te 4 words encoder dout transmitted continuously 4 words address/data bit waveform each programmable address/data pin can be externally se t to one of the following two logic states as shown below. fosc "one" "zero" address/ data bit address/data programming (preset) the status of each address/dat a pin can be individually pre-set to logic ?high? or ?low?. if a transmission-enable signal is applied, the encoder scans and transmits the status of t he 12 bits of address/data serially in the order a0 to ad11. during information transmission these bits are transmitted with a preceding synchronization bit. if the trigger signal is not applied, the chip ent ers the standby mode and consumes a reduced current of less than 1 a for a supply voltage of 5v. the following figure shows an application using the utc ut912e : v dd a0 a1 a2 a3 a4 a5 a6 a7 v ss te ad8 ad9 ad10 ad11 osc1 osc2 transmission medium v ss v dd dout transmitted information: a0 a1 a2 a3 a4 a5 a6 a7 ad8 ad9 ad10 ad11 pilot & sync. 1 0 1 0 0 0 1 1 1 1 1 0
ut912e cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r502-022.c ? functional description (cont.) address/data sequence the following provides the address/data seque nce table for various models of the utc ut912e encoders. 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/ date a0 a1 a2 a3 a4 a5 a6 a7 ad8 ad9 ad10 ad11 ? typical application circuit a0 a1 a2 a3 a4 a5 a6 a7 v ss 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 v dd rosc v dd dout osc1 te ad11 ad10 ad9 ad8 transmitter circuit osc2 ? approximate internal connections osc1 oscillator 1 osc2 en cmos out cmos in pull-high vdd nmos transmission gate protection diode nmos transmission gate
ut912e cmos ic unisonic technologies co., ltd 9 of 8 www.unisonic.com.tw qw-r502-022.c ? oscillator frequency vs supply voltage the recommended oscillator frequency is f oscd (decoder) 50f osce ( ut912e encoder) utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) 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 systems where malfunction 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 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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