HT12A/HT12E

212 Series of Encoders

Selection Table

Function Address

No.

Address/

Data No.

Data

No.

Oscillator Trigger

Package

Carrier

Output

Negative

Polarity

Part No.

HT12A

8

0

4

455kHz

resonator

D8~D11

18 DIP

20 SOP

38kHz

No

HT12E

8

4

0

RC

oscillator

TE

18 DIP

20 SOP

No

No

Note: Address/Data represents pins that can be address or data according to the decoder require-

ment.

General Description

The 212 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 ad-

dress/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 ap-

plication flexibility of the 212 series of encoders.

The HT12A additionally provides a 38kHz car-

rier for infrared 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: 0.1mA (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

·

HT12A/E: 18-pin DIP/20-pin SOP package

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