HT12A/HT12E
2
12
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 Holtek¢s 2
12
series of decoders
·
18-pin DIP, 20-pin SOP package
technology
·
Low standby current: 0.1mA (typ.) at V
DD
=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 encod-
ing 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 ad-
dresses/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 2
12
se-
ries 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
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
