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HT12A/HT12E 212 Series of Encoders Features · Operating voltage - 2.4V~5V for the HT12A - 2.4V~12V for the HT12E · Low power and high noise immunity CMOS · 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 Holtekўs 212 series of decoders · 18-pin DIP, 20-pin SOP package technology · Low standby current: 0.1mA (typ.) at VDD=5V · HT12A with a 38kHz carrier for infrared transmission medium 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 General Description 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 12 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. HT12A HT12E Note: 8 8 0 4 4 0 455kHz D8~D11 resonator RC oscillator TE Carrier Output 38kHz No Negative Polarity No No Package 18DIP, 20SOP 18DIP, 20SOP Address/Data represents pins that can be either address or data according to the application requirement. Rev. 1.10 1 January 24, 2003 HT12A/HT12E Block Diagram TE Trigger HT12E O S C 2 O S C 1 T E O s c illa to r ё 3 D iv id e r D a ta S e le c t & B u ffe r S y n c . C ir c u it D O U T A 0 1 2 T r a n s m is s io n G a te C ir c u it A 7 ё 1 2 C o u n te r & 1 o f 1 2 D e c o d e r B in a r y D e te c to r A D 8 A D 1 1 V D D V S S DATA Trigger HT12A X 2 X 1 O s c illa to r L /M B A 0 1 2 T r a n s m is s io n G a te C ir c u it A 7 ё 5 7 6 D iv id e r D a ta S e le c t & B u ffe r S y n c . C ir c u it D O U T ё 1 2 C o u n te r & 1 o f 1 2 D e c o d e r B in a r y D e te c to r D 8 D 1 1 V D D V S S Note: The address data pins are available in various combinations (refer to the address/data table). Pin Assignment 8 -A d d re s s 4 -D a ta A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 V S S 9 8 7 6 5 4 3 2 1 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 V D D D O U T X 1 X 2 L /M D 1 1 D 1 0 D 9 D 8 8 -A d d re s s 4 -D a ta N C 1 2 3 4 5 6 7 8 9 1 0 A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 V S S 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 N C V D D D O U T X 1 X 2 L /M D 1 1 D 1 0 D 9 D 8 8 -A d d re s s 4 -A d d r e s s /D a ta 8 -A d d re s s 4 -A d d r e s s /D a ta N C 1 2 3 4 5 6 7 8 9 1 0 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1