Princeton Technology Corp.

Tel: 886-2-29162151

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

Infrared Remote Control Transmitter

PT2221/2

PT2221/2 v 3.4

Page 3

Revised Oct. 2000

PT2221 APPLICATION CIRCUIT

KI

KI

KI

KI

0

1

2

3

KI/O

KI/O

KI/O

KI/O

KI/O

KI/O

KI/O

KI/O

0

1

2

3

4

5

6

7

PT2221

OSCI

OSCO

V

LMP

REM

DD

SEL

Vss

CCS

455 KHz

200 pf

200 pf

3V

LED

470

1

IR

LED

For Custom Code

Selection

100K

IN4148

+

10

F

16 V

Note: The Vcc and Vss Terminals must be “SHORT” before the batteries are loaded to the

transmitter handset to insure that PT2221 Power On Reset Function will operate properly.