Datasheet HT12A, HT12E (Holtek)

HT12A/HT12E 212 Series of Encoders Features
· Operating voltage · Minimum transmission word - 2.4V~5V for the HT12A - Four words for the HT12E - 2.4V~12V 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
The 212 encoders are a series of CMOS LSIs for remote bits via an RF or an infrared transmission medium upon control system applications. They are capable of encod- receipt of a trigger signal. The capability to select a TE ing information which consists of N address bits and trigger on the HT12E or a DATA trigger on the HT12A 12-N data bits. Each address/data input can be set to further enhances the application flexibility of the 212 se- one of the two logic states. The programmed ad- ries of encoders. The HT12A additionally provides a dresses/data are transmitted together with the header 38kHz carrier for infrared systems.
Selection Table Function Address Address/ Carrier Negative Data No. Oscillator Trigger Package No. Data No. Output Polarity Part No.
455kHz HT12A 8 0 4 D8~D11 38kHz No 18DIP, 20SOP resonator RC HT12E 8 4 0 TE No No 18DIP, 20SOP oscillator Note: Address/Data represents pins that can be either address or data according to the application requirement. Rev. 1.20 1 February 20, 2009 Document Outline Features Applications General Description Selection Table Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings Electrical Characteristics Functional Description Application Circuits Package Information Product Tape and Reel Specifications