HT12A/HT12E
12
2 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
technology
Low standby current: 0.1mA (typ.) at
V
DD
=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
General Description
The 2
12
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 2
12
series of encoders.
The HT12A additionally provides a 38kHz car-
rier for infrared systems.
Selection Table
Function Address Address/ Data
Oscillator
No.
Data No. No.
Part No.
HT12A
HT12E
8
8
0
4
4
0
455kHz
resonator
RC
oscillator
Trigger
D8~D11
TE
Package
18 DIP
20 SOP
18 DIP
20 SOP
Carrier
Output
38kHz
No
Negative
Polarity
No
No
Note: Address/Data represents pins that can be address or data according to the decoder require-
ment.
1
April 11, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
