Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2248 V2.7

- 6 -

June, 2005

Infrared Remote Control Transmitter

PT2248

DATA CODE

Data

Data

Key

No.

H

S1

S2

D1

D2

D3

D4

D5

D6

Output

Form

Key

No.

H

S1

S2

D1

D2

D3

D4

D5

D6

Output

Form

1

1

0

0

1

0

0

0

0

0

Continuous

10

0

1

0

0

0

0

1

0

0

Single-Shot

2

1

0

0

0

1

0

0

0

0

Continuous

11

0

1

0

0

0

0

0

1

0

Single-Shot

3

1

0

0

0

0

1

0

0

0

Continuous

12

0

1

0

0

0

0

0

0

1

Single-Shot

4

1

0

0

0

0

0

1

0

0

Continuous

13

0

0

1

1

0

0

0

0

0

Single-Shot

5

1

0

0

0

0

0

0

1

0

Continuous

14

0

0

1

0

1

0

00

0

0

Single-Shot

6

1

0

0

0

0

0

0

0

1

Continuous

15

0

0

1

0

0

1

0

0

0

Single-Shot

7

0

1

0

1

0

0

0

0

0

Single-Shot

16

0

0

1

0

0

0

1

0

0

Single-Shot

8

0

1

0

0

1

0

0

0

0

Single-Shot

17

0

0

1

0

0

0

0

1

0

Single-Shot

9

0

1

0

0

0

1

0

0

0

Single-Shot

18

0

0

1

0

0

0

0

0

2

Single-Shot

Since multiple keying is possible, Key No. 1 ~ 6 (in combination with D1 ~ D6 data) are capable of

sending out 63 commands. Key No. 7 ~ 18 are single-shot keys capable of sending out 12 commands.

Thus, a total of 75 commands can result from a combination of continuous keys (multiple keying) and

single-shot keys.

CODE BITS (C1, C2 AND C3)

Code bits can be made at one terminal with diodes connected through T1 ~ T3 timing terminals.

Data of C1, C2 and C3 Code Bits become “1” when diodes are connected to CODE Terminal through

the timing signal terminals -- T1 ~ T3, and “0” when diodes are not connected.

CO D E

T3

(C3 )

T2

(C2 )

T1

(C1 )

In the diagram above: C1, C2 and C3 are 1, 1, and 1 data respectively.

PT2248 has three (3) Code Bits. The receiving IC -- PT 2249A Series (DIP 16 Pins) can only use C2

and C3 Code Bits, while PT 2250A Series (DIP 24 Pins) are able to use only C1 and C2 Code Bits.

Therefore, diodes must be connected so that PT2248 Code Bits Data match with that of the receiving

IC.