2 12 Series of Decoders
Description
Features
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Operating voltage: 2.
4V~12V Low power and high noise immunity CMOS technology Low standby current Capable of decoding 12 bits of information 12 Pair with Holtek¢s 2 series of encoders Binary address setting Received codes are checked 3 times
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212 Series of Decoders
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Address/Data number combination - HT12D: 8 address bits and 4 data bits - HT12F: 12 address bits only Built-in oscillator needs only 5% resistor Valid transmission indicator Easy interface with an RF or an infrared transmission medium Minimal external components
Applications
Burglar alarm system Smoke and fire alarm system Garage door controllers Car door controllers
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Car alarm system Security system Cordless telephones Other remote control systems
General Description
The 2 decoders are a series of CMOS LSIs for remote control system applications.
They are 12 paired with Holtek¢s 2 series of encoders (refer to the encoder/decoder cross reference tab l e ) .
F or p r op er op er a t i on, a p a i r o f encoder/decoder with the same number of addresses and data format should be chosen.
The decoders receive serial addresses and data 12 from a programmed 2 series of encoders that are transmitted by a carrier using an RF or an IR transmission medium.
They compare the serial input data three times continuously with
12
Selection Table
Part No.
HT12F
Function Address No.
8 12
HT12D
Notes: Data type: L stands for latch type data output.
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VT can be used as a momentary data output.
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Data
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VT Ö Ö
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their local addresses.
If no error or unmatched codes are found, the input data codes are decoded and then transferred to the output pins.
The VT pin also goes high to indicate a valid transmission.
The 2 series of decoders are capable of decoding informations that consist of N bits of address and 12-N bits of data.
Of this series, the HT12D is arranged to provide 8 address bits and 4 data b...
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