Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2264 v1.0

- 6 -

June, 2004

Remote Control Encoder IC

PT2264

CODE FRAME

A Code Frame consists of four (4) continuous Code Words. When PT2264 detects “0” on the /TE

(meaning, the /TE is active “low”), it outputs a Code Frame at DOUT. If /TE is still active at the time the

Code Frame transmission ends, PT2264 outputs another Code Frame. It should be noted that the

Code Frame is synthesized at the time of transmission.

/TE

DOUT

one frame (=4 word)

one frame

one frame

SIGNAL RESISTOR OSCILLATOR

The built–in oscillator circuitry of PT2264 allows a precision oscillator to be constructed by connecting

an external resistor between OSC1 and OSC2 pins. For PT2294 to decode correctly the received

waveform, the oscillator frequency of PT2294 must be 2.5 ~ 8 times that of transmitting PT2264. The

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

100

10

1

KHz

3

6

9

12

15

V O L T A G E

R = 510 K

R = 1 M

R = 2 M

R = 3.3 M

R = 4.7 M

PT2264 Encoder OSC Frequency