PT2294 データシートの表示（PDF） - Princeton Technology

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PT2294

Remote Control Decoder IC

Princeton Technology 

Remote Control Decoder IC

Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2294

CODE WORD

A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync

Bit. The 12 AD bits are interpreted as either address or data bits depending on the PT2294 version

used. Please refer to the diagrams below:

PT2294:

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC

PT2294–M4/L4:

A0 A1 A2 A3 A4 A5 A6 A7 D3 D2 D1 D0 SYNC

One Complete Code Word

SINGLE RESISTOR OSCILLATOR

The built-in oscillator circuitry of PT2294 allows a precision oscillator to be constructed with only an

external resistor. For the PT2294 to decode correctly the waveform that was received, the oscillator

frequency of PT2294 must be 1/16 ~ 4 (or 2 to 30) times that of the transmitting PT2264. It is a good

practice to center the PT2294 oscillator frequency in this window to gain best window margin at both

sides. The typical oscillator with various resistor values are shown below for PT2264 and PT2294.

100

10

KHz

R = 510 K

R=1M

R=2M

R = 3.3 M

R = 4.7 M

1

3

6

9

12

15

V O LTAG E

PT2264 Encoder OSC Frequency

PT2294 V1.2

-6-

April, 2006

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