HT12A/HT12E
The transmitted information is as shown:
Pilot
&
Sync.
A0
1
A1
0
A2
1
A3
0
A4
0
A5
0
A6
1
A7
1
AD8
1
AD9
1
AD10
1
AD11
0
Address/Data Sequence
The following provides the address/data sequence table for various models of the 2
12
series of encoders.
Address/Data Bits
Part No.
0
HT12A
HT12E
A0
A0
1
A1
A1
2
A2
A2
3
A3
A3
4
A4
A4
5
A5
A5
6
A6
A6
7
A7
A7
8
D8
AD8
9
D9
AD9
10
D10
AD10
11
D11
AD11
Transmission Enable
For the HT12E encoders, transmission is enabled by applying a low signal to the TE pin. For the HT12A encoders,
transmission is enabled by applying a low signal to one of the data pins D8~D11.
Two Erroneous HT12E Application Circuits
The HT12E must follow closely the application circuits provided by Holtek (see the
²Application
circuits²).
·
Error: AD8~AD11 pins input voltage > V
DD
+0.3V
O S C 2
V D D
O S C 1
T E
V S S
A D 1 1
A D 1 0
A D 9
A D 8
1 2 V
H T 1 2 E
·
Error: The IC¢s power source is activated by pins AD8~AD11
1 2 V
O S C 2
V D D
O S C 1
T E
V S S
A D 1 1
A D 1 0
A D 9
A D 8
H T 1 2 E
Rev. 1.10
7
January 24, 2003
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
