HT12A_03 Datasheet, PDF (1/14 Pages) Holtek Semiconductor Inc – 212 Series of Encoders

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
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
· Pair with Holtek¢s 2¹² series of decoders
· 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 2¹² 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
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 se-
ries of encoders. The HT12A additionally provides a
38kHz carrier for infrared systems.
Selection Table
Function _Address
Part No.
No.
Address/
Data No.
Data No.
Oscillator
Trigger
HT12A
8
0
4
455kHz
resonator
D8~D11
HT12E
8
4
0
RC
oscillator
TE
Carrier
Output
38kHz
No
Negative
Polarity
Package
No 18DIP, 20SOP
No 18DIP, 20SOP
Note: Address/Data represents pins that can be either address or data according to the application requirement.
Rev. 1.10
1
January 24, 2003