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The 212 encoders are a series of CMOS LSIs for remote control system applications. They are 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 together with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal. The capability to select a TE trigger on the HT12E or a DATA trigger on the HT12A further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a 38kHz carrier for infrared systems.
Operating voltage 2.4V~5V for the HT12A 2.4V~12V for the HT12E Low power and high noise immunity CMOS technology Low standby current: 0.1A (typ.) at VDD=5V HT12A with a 38kHz carrier for infrared transmission medium Minimum transmission word Four words for the HT12E One word for the HT12A Built-in oscillator needs only 5% resistor Data code has positive polarity Minimal external components Pair with Holtek's 212 series of decoders 18-pin DIP