Princeton Technology Corp.

Tel: 886-2-29162151

Fax: 886-2-29174598

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

Infrared Remote Control Receiver

PT2249A / PT2250A Series

PT2249A/50A v 2.3

Page 6

Revised Dec. 1999

e) The Code Bits Combinations of PT2248 and PT2250A Series are shown

below:

PT2248

PT2250A Series

C1

C2

C3

C1

C2

001

0

0

011

0

1

101

1

0

111

1

1

f) Example : (Refer to Example 2 diagram)

The following example shows the case when PT2248 Code Bits C1 = 0,

C2 = 0, and C3 = 1. The CODE1 and CODE2 pins of the PT2250A Series

are connected to the Vss (C1=0 and C2=0). In this way, the PT2250A or

any of its series matches the C1 and C2 Code Bits of PT2248; thus, the

remote commands are correctly decoded.

CODE

T3

T2

T1

K6

C1=0 C2=0

PT2248

CODE1 CODE2 OSC

Vcc

PT2250A Series

+5V

C1=0 C2=0

Example 2

Circuit Diagram when Code Bit C1= 0 and C2 = 0