TC9243APG/AFG

2005-02-25

2

Block Diagram

Pin Function

Pin No.

Symbol

Pin Name

Function and Operation

1

GND

20

Power Terminal

2

T

X

3

Oscillator Terminal

Input/output terminals for the ceramic oscillators, with built-in

amplifier circuit and feedback resistor

4

RST

Reset Input

When this pin is set at “L” level, the inside is initialized.

Equipped with a built-in pull-up resistor.

5~12

Key Inputs

Input terminals for the key matrix.

Each pin has a built-in pull-down resistor.

13~16

Key Scan Output

Key matrix scan output terminals.

CMOS output.

17

CODE

Code Scan Output

Scan output terminals for code setting.

P-ch open drain output.

18

Transmission Display Output

Transmission display LED driving output terminal

19

Transmission Output

Infrared LED driving output terminal