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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
HT12A/HT12E
Block Diagram
TE trigger
HT12E
O S C 2
O S C 1
T E
O s c illa to r
¸
3 D iv id e r
D a ta S e le c t
& B u ffe r
S y n c .
C ir c u it
D O U T
A 0
1 2 T r a n s m is s io n
G a te C ir c u it
A 7
¸
1 2 C o u n te r &
1 o f 1 2 D e c o d e r
B in a r y D e te c to r
A D 8
A D 1 1
V D D
V S S
DATA trigger
HT12A
X 2
X 1
O s c illa to r
L /M B
A 0
1 2 T r a n s m is s io n
G a te C ir c u it
A 7
¸
5 7 6 D iv id e r
D a ta S e le c t
& B u ffe r
S y n c .
C ir c u it
D O U T
¸
1 2 C o u n te r &
1 o f 1 2 D e c o d e r
B in a r y D e te c to r
D 8
D 1 1
V D D
V S S
Note: The address data pins are available in various combinations (refer to the address/data table).
2
April 11, 2000
HT12A/HT12E
Pin Assignment
8 -A d d re s s
4 -D a ta
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V S S
9
8
7
6
5
4
3
2
1
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
1 0
V D D
D O U T
X 1
X 2
L /M B
D 1 1
D 1 0
D 9
D 8
8 -A d d re s s
4 -D a ta
N C
1
2
3
4
5
6
7
8
9
1 0
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V S S
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
N C
V D D
D O U T
X 1
X 2
L /M B
D 1 1
D 1 0
D 9
D 8
8 -A d d re s s
4 -A d d r e s s /D a ta
8 -A d d re s s
4 -A d d r e s s /D a ta
N C
1
2
3
4
5
6
7
8
9
1 0
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
N C
V D D
D O U T
O S C 1
O S C 2
T E
A D 1 1
A D 1 0
A D 9
A D 8
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V S S
9
8
7
6
5
4
3
2
1
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
1 0
V D D
D O U T
O S C 1
O S C 2
T E
A D 1 1
A D 1 0
A D 9
A D 8
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V S S
H T 1 2 A
1 8 D IP
H T 1 2 A
2 0 S O P
H T 1 2 E
1 8 D IP
H T 1 2 E
2 0 S O P
Pin Description
Pin Name
I/O
Internal
Connection
CMOS IN
Pull-high
(HT12A)
A0~A7
I
NMOS
Input pins for address A0~A7 setting
TRANSMISSION These pins can be externally set to VSS or left open
GATE
PROTECTION
DIODE
(HT12E)
NMOS
TRANSMISSION
Input pins for address/data AD8~AD11 setting
GATE
PROTECTION These pins can be externally set to VSS or left open
DIODE
(HT12E)
CMOS IN
Pull-high
CMOS OUT
CMOS IN
Pull-high
Input pins for data D8~D11 setting and transmission en-
able, active low
These pins should be externally set to VSS or left open
(see Note)
Encoder data serial transmission output
Latch/Momentary transmission format selection pin:
Latch: Floating or VDD
Momentary: VSS
Description
AD8~AD11
I
D8~D11
DOUT
L/MB
I
O
I
3
April 11, 2000
HT12A/HT12E
Pin Name
TE
OSC1
OSC2
X1
X2
VSS
VDD
I/O
I
I
O
I
O
I
I
Internal
Connection
CMOS IN
Pull-high
OSCILLATOR 1
OSCILLATOR 1
OSCILLATOR 2
OSCILLATOR 2
¾
¾
Description
Transmission enable, active low (see Note)
Oscillator input pin
Oscillator output pin
455kHz resonator oscillator input
455kHz resonator oscillator output
Negative power supply, grounds
Positive power supply
Note: D8~D11 are all data input and transmission enable pins of the HT12A.
TE is a transmission enable pin of the HT12E.
Approximate internal connections
N M O S
T R A N S M IS S IO N
G A T E
C M O S IN
P u ll- h ig h
C M O S O U T
E N
O S C 1
O S C IL L A T O R 1
O S C 2
O S C IL L A T O R
2
N M O S T R A N S M IS S IO N G A T E
P R O T E C T IO N D IO D E
X 2
V
D D
X 1
Absolute Maximum Ratings
Supply Voltage (HT12A) ..............-0.3V to 5.5V
Input Voltage....................V
SS
-0.3
to V
DD
+0.3V
Operating Temperature...............-20°C to 75°C
Note: These are stress ratings only. Stresses exceeding the range specified under
²Absolute
Maxi-
mum Ratings² may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo-
sure to extreme conditions may affect device reliability.
Supply Voltage (HT12E) ...............-0.3V to 13V
Storage Temperature.................-50°C to 125°C
4
April 11, 2000
HT12A/HT12E
Electrical Characteristics
HT12A
Symbol
V
DD
I
STB
I
DD
I
DOUT
V
IH
V
IL
R
DATA
HT12E
Symbol
V
DD
I
STB
I
DD
I
DOUT
V
IH
V
IL
f
OSC
R
TE
Parameter
Operating Voltage
Standby Current
Operating Current
Output Drive Current
²H²
Input Voltage
²L²
Input Voltage
Oscillator Frequency
TE Pull-high Resistance
Test Conditions
V
DD
¾
3V
12V
3V
Conditions
¾
Oscillator stops
Min.
2.4
¾
¾
¾
¾
-1
1
0.8V
DD
0
¾
¾
Typ.
5
0.1
2
40
150
-1.6
1.6
¾
¾
3
1.5
Max.
12
1
4
80
300
¾
¾
V
DD
0.2V
DD
¾
3
Parameter
Operating Voltage
Standby Current
Operating Current
Output Drive Current
²H²
Input Voltage
²L²
Input Voltage
D8~D11 Pull-high
Resistance
Test Conditions
V
DD
¾
3V
5V
3V
5V
5V
¾
¾
5V
Conditions
¾
Oscillator stops
No load
f
OSC
=455kHz
V
OH
=0.9V
DD
(Source)
V
OL
=0.1V
DD
(Sink)
¾
¾
V
DATA
=0V
Min.
2.4
¾
¾
¾
¾
-1
2
0.8V
DD
0
¾
Typ.
3
0.1
0.1
200
400
-1.6
3.2
¾
¾
150
Max.
5
1
1
400
800
¾
¾
V
DD
0.2V
DD
300
Ta=25°C
Unit
V
mA
mA
mA
mA
mA
mA
V
V
kW
Ta=25°C
Unit
V
mA
mA
mA
mA
mA
mA
V
V
kHz
MW
No load
12V f
OSC
=3kHz
5V
¾
¾
5V
5V
V
TE
=0V
V
OH
=0.9V
DD
(Source)
V
OL
=0.1V
DD
(Sink)
¾
¾
R
OSC
=1.1MW
5
April 11, 2000

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