Holtek HT12A / HT12E 2(12) Series of Encoders
General Description
The 2(12) 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 12N 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.
Applications
– Burglar alarm system
– Smoke and fire alarm system
– Garage door controllers
– Car door controllers
– Car alarm system
– Security system
– Cordless telephones
– Other remote control systems
Features
– 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: 0.1 A (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 2(12 )series of decoders
– 18-pin DIP, 20-pin SOP package
