Datasheet Holtek HT12E

HT12A/HT12E
212 Series of Encoders
Features Operating voltage Minimum transmission word -2.4V~5V for the HT12A
-2.4V~12V for the HT12E -Four words for the HT12E
-One word for the HT12A Low power and high noise immunity CMOS Built-in oscillator needs only 5% resistor technology Data code has positive polarity Low standby current: 0.1mA (typ.) at VDD=5V Minimal external components HT12A with a 38kHz carrier for infrared transmission Pair with Holtek¢s 212 series of decoders medium 18-pin DIP, 20-pin SOP package Applications Burglar alarm system Car alarm system Smoke and fire alarm system Security system Garage door controllers Cordless telephones Car door controllers Other remote control systems General Description
12 The 2 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. Selection Table
Function Address Address/
Data No. Oscillator Trigger
No.
Data No.
Part No. Carrier
Output Negative
Polarity 38kHz No 18DIP, 20SOP No No 18DIP, 20SOP HT12A 8 0 4 455kHz
D8~D11
resonator HT12E 8 4 0 RC
oscillator Note: TE Package Address/Data represents pins that can be either address or data according to the application requirement. Rev. 1.20 1 February 20, 2009 HT12A/HT12E …