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PT2212 V1.1

- 11 -

May, 2007

Infrared Remote Control Transmitter

PT2212

It is highly recommended that the following notes must be strictly observed in the preparation of the

reception software:

• System Code

The 8-bit system code is transmitted twice. Therefore, you must decode both codes to be

identical.

• Data Code

The 8-bit data code is transmitted simultaneously with its inversion code. Therefore, you must

decode the data code and its inversion code and never fail to check their integrity.

SYSTEM CODE LATCH CIRCUIT

There are 8 kinds of system code that can be selected by wiring the SEL pin to any one of the output

pins-KO0 ~ KO7. The fourth bit of the system code (S3) is set to “1”, S4 to S7 bits are “0”. Please refer

to the table and diagram below.

KO connected to SEL

System Code (S2 S1 S0)

KO0

000

KO1

001

KO2

010

KO3

011

KO4

100

KO5

101

KO6

110

KO7

111

Following is the system code selection diagram.

Notes:

1. S0, S1, S2 = 010

2. System Code = 01010000 (S0 to S7)