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PDF HT12A Data sheet ( Hoja de datos )
| Número de pieza | HT12A | |
| Descripción | Series of Encoders | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT12A (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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
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
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.
Selection Table
Function Address Address/
Part No.
No. Data No.
Data
No.
Oscillator
Trigger
HT12A
8
0
4
455kHz
resonator
D8~D11
HT12E
8
4
0
RC
oscillator
TE
Package
18 DIP
20 SOP
18 DIP
20 SOP
Carrier Negative
Output Polarity
38kHz
No
No No
Note: Address/Data represents pins that can be address or data according to the decoder require-
ment.
1 April 11, 2000
1 page  
HT12A/HT12E
Electrical Characteristics
HT12A
Symbol
Parameter
VDD
ISTB
Operating Voltage
Standby Current
IDD Operating Current
IDOUT Output Drive Current
VIH
VIL
RDATA
²H² Input Voltage
²L² Input Voltage
D8~D11 Pull-high
Resistance
Ta=25°C
Test Conditions
VDD
Conditions
¾¾
Min. Typ. Max. Unit
2.4 3
5V
3V
Oscillator stops
5V
¾ 0.1 1 mA
¾ 0.1 1 mA
3V No load
5V fOSC=455kHz
¾ 200 400 mA
¾ 400 800 mA
VOH=0.9VDD (Source) -1 -1.6
5V
VOL=0.1VDD (Sink)
2 3.2
¾ ¾ 0.8VDD ¾
¾
¾
VDD
mA
mA
V
¾¾
0 ¾ 0.2VDD V
5V VDATA=0V
¾ 150 300 kW
HT12E
Ta=25°C
Symbol
Parameter
VDD
ISTB
Operating Voltage
Standby Current
Test Conditions
VDD
Conditions
¾¾
3V
Oscillator stops
12V
Min. Typ. Max. Unit
2.4 5 12 V
¾ 0.1 1 mA
¾2
4 mA
IDD Operating Current
3V No load
12V fOSC=3kHz
¾ 40 80 mA
¾ 150 300 mA
IDOUT
VIH
VIL
fOSC
RTE
Output Drive Current
²H² Input Voltage
²L² Input Voltage
Oscillator Frequency
TE Pull-high Resistance
VOH=0.9VDD (Source) -1 -1.6 ¾ mA
5V
VOL=0.1VDD (Sink)
1 1.6 ¾ mA
¾
¾
0.8VDD ¾
VDD
V
¾¾
0 ¾ 0.2VDD V
5V ROSC=1.1MW
¾ 3 ¾ kHz
5V VTE=0V
¾ 1.5
3 MW
5 April 11, 2000
5 Page 
Oscillator frequency vs supply voltage
fO S C
(S c a le )
7 .0 0
6 .0 0
5 .0 0
4 .0 0
(3 k H z )3 .0 0
2 .0 0
1 .0 0
HT12A/HT12E
R O S C (W )
470k
510k
560k
620k
680k
750k
820k
910k
1 .0 M
1 .2 M
1 .5 M
2 .0 M
2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 V D D (V D C )
The recommended oscillator frequency is fOSCD (decoder) @ 50 fOSCE (HT12E encoder)
@
1
3
fOSCE
(HT12A
encoder)
11 April 11, 2000
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HT12A.PDF ] | |
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