Address/Data sequence

The following provides the address/data sequence table for various models of the 212 series of

encoders. The correct device should be selected according to the individual address and data require-

ments.

Part No.

Address/Data Bits

0123456789

10

11

HT12A

A0

A1

A2

A3

A4

A5

A6

A7

D8

D9

D10

D11

HT12E

A0

A1

A2

A3

A4

A5

A6

A7

AD8 AD9 AD10 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 cir-

cuits²).

· Error: AD8~AD11 pins input voltage > VDD+0.3V

HT12A/HT12E

H T 12E

OS C 2

OS C 1

TE

VSS

VD D

AD 1 1

AD 1 0

AD 9

AD 8

12V