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SC50560-001

INFRARED REMOTE CONTROL TRANSMITTER

Silan Microelectronics 

Silan

Semiconductors

SC50560

3. CARRIER

The carrier of the transmission signal is 38KHz and one pulse width is 0.52ms. Therefor, with the exception of

the leader code, there are twenty 38KHz clock in one pulse width. Please refer to the diagram below.

0.52ms

8.7µs

26.3µs

Figure 5. Transmission Signal Carrier Diagram

4. KEY INPUT

By connecting the input pins – KI0 to KI3 and scan output pins –KO0 to KO7 (also known as the Standard Keys),

a 4x8 key matrix may be formed. Likewise, a maximum of 256 instructions may be provided by connecting the input

CS with the scan output –KO0 to KO7 (also known as the Extended Keys). When two or more standard keys are

pressed, the transmission output Dout is kept at LOW and no transmission code is outputted. Please refer to the

tables below.

Data

D0

D1

Key Input

KI0

0

0

KI1

1

0

KI2

0

1

KI3

1

1

Data

D2

D3

D4

Scan Output

Data

D5

D6

D7

CS Input

KO0

KO1

0

0

0

1

0

0

KO5

KO6

1

--

--

--

1

--

KO2

KO3

0

1

0

1

1

0

KO7

--

--

1

KO4

KO5

0

0

1

1

0

1

KO6

KO7

0

1

1

1

1

1

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.3 2002-03-21

5

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