PT2248 データシートの表示（PDF） - Princeton Technology

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PT2248

Infrared Remote Control Transmitter

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Infrared Remote Control Transmitter

PT2248

The PT2248 Code Bits Connection Table for PT 2249A / PT 2250A Series Application is given below:

PT2248 Code Pin

T1 (C1 Code)

T2 (C2 Code)

T3 (C3 Code)

Rx PT2249A PT2250A

Diode

C2

C3

C1

C2

Diode

Note: where C1, C2, C3 will be “1” if one diode is connected between CODE and Tn pins; n=1 to 3 in

PT2248; otherwise, it will be set to “0”.

Note: When communicating with any of the PT2249A Series Receivers, C1 Code Bit Data is not used.

Therefore, it is necessary to connect diodes to the Code terminal corresponding to C1 Code Bit

of PT2248. (In this way, the C1 Code Bit of PT2248 transmits “1”. Likewise, when

communicating with any of the PT2250A Series Receivers, C3 Code Bit is not used. Therefore,

it is necessary to connect diodes to the Code Terminal corresponding to the C3 Code Bit of

PT2248.)

TRANSMITTING WAVEFORM

a 3a

Co de Bit

Con tinu ous/

S ingle-Sh ot Code

48 a

Key Input Code

The diagram above shows the basic transmitting waveform. A basic transmitting waveform consists of

12-bits serial data.

The time of bit “a” is dependent on the oscillation frequency (fosc) and is given by the following formula:

1

a = fosc x 192

PT2248 V2.7

-7-

June, 2005

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