remote control


Posted on Feb 5, 2014

Every key pad button generates 5 bit binary code and IC1 sends this code to the IR leds through D1 and D2 diodes. Code is shaped from 6 pulses with 5 gaps. Pulse position modulation PPM technique is used for transferring data. Data information occurs at gaps. For logic 0, long gap, for logic 1 short gap is generated. SL490 includes an auto sta


remote control
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nd-by circuitry. When the buttons are not used for a while, IC will swich to stand-by mode and stand by current will be 6uA.




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