HT12A Holtek Semiconductor Inc, HT12A Datasheet - Page 9

• Manufacturer Part Number: HT12A
• Description: Series of Encoders
• Manufacturer: Holtek Semiconductor Inc

Address/Data sequence
The following provides the address/data sequence table for various models of the 2
encoders. The correct device should be selected according to the individual address and data require-
ments.
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 cir-
cuits²).
·
HT12A
HT12E
Error: AD8~AD11 pins input voltage > V
Part No.
A0
A0
0
A1
A1
1
A2
A2
2
A3
A3
3
DD
A4
A4
4
+0.3V
Address/Data Bits
9
A5
A5
5
A6
A6
6
A7
A7
7
AD8
D8
8
AD9 AD10 AD11
D9
HT12A/HT12E
9
D10
April 11, 2000
10
12
series of
D11
11