Silan

Semiconductors

SC50462

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.1

2002-02-28

3

PIN DESCRIPTION

Pin No.

Pin Name

Input/output

Description

1,24

Vss,Vcc

Power

Power Supply: Vcc=3.0V,Vss=0V

2,3

OSCI,OSCO

I/O

Oscillator Input/Output Pin, 455 or 480kHz Crystal is connected

between these pins.

4

CNTR

O

Transmitting Indicator. An LED and resistor are connected from

this pintoVcc.

5~12

S1~S8

O

Key Scan Signal Output pins.

13~20

I1~I8

I

Key Scan Signal Input pins.

21,22

C4

C5

,

I

Custom Code

23

OUT

O

Modulation Pin

FUNCTIONAL DESCRIPTION

SC50462 is a sending signal IC on infrared remote control. Consisting of timing generating circuit, scan signal

generating circuit, key input encoder, instruction decoder, custom code circuit, code encoder, and output buffer. It

has 8*8 key matrix input and custom code with 16 bit PCM which shows 76 instructions.76Instruction are devided

in 64 one shot signal and 12 2-shot signal.

When Input Signal(I1~I8) and/or in combination with the Scan Signals(S1~S8) are activated, SC50462 checks

the ID and the Custom Code Bits--

4

C

and

5

C --setting before finally sending out the remote control signal.

The CNTR Pin is the LED transmission Indicator. This means that Whenever a valid transmission is sent, the

LED lights up. The CNTR output becomes “L” in the 7

C0

C1

C2

C3

C4

C5

C7

D0

D1

D2

D3 D4

D5

D6

D7

C6

7th

17th

One Word

OUT

CNTR

Next

Frame

44ms or 46.4ms

Note: Oscillator Frequency=480 or 455kHz