SC50462 datasheet(3/11 Pages) SILAN

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SC50462

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:2.2

2005.12.15

Http: www.silan.com.cn

Page 3 of 12

PIN DESCRIPTION

Pin No.

Pin Name

Description

1,24

VSS, VCC

Power Supply: VCC=3.0V,VSS=0V

2,3

OSCI,OSCO

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

pins.

CNTR

Transmitting Indicator. An LED and resistor are connected from this pin to Vcc.

5~12

I1~I8

Key Scan Signal Input pins.

13~20

S1~S8

Key Scan Signal Output pins.

21,22

Custom Code

OUT

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

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

1. CNTR OUTPUT

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

th pulse-rising and “H”in the 17th pulse-rising.

Note: Oscillator Frequency=480 or 455kHz

2. OSCILLATING CIRCUIT

An oscillator circuit may be constructed by using a 480kHz or 455kHz Crystal Resonator and two capacitors.

Please refer to the following diagram. The carrier frequency transmitted is 40kHz or 37.9kHz.Unless any legal

key input is activated, the oscillation is automatically stopped. Thus ,power consumption is considerably reduced.

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