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PT2268 V2.5

- 5 -

April, 2006

Remote Control Encoder

PT2268

TRANSMISSION WAVEFOM

When any of the 8 keys (I1 ~ I8) is set to “High”, the TxOUT outputs one start word followed by 2

identical data words and a space. The code will be continuously outputted until the key is released. If

for any reason, the key was released during the code transmission process, the code that is being

transmitted during the key release action will still be completely outputted. Please refer to the following

diagram.

Start

Word

Start

Word

Start

Word

1st

Word

1st

Word

1st

Word

2nd

Word

2nd

Word

2nd

Word

Space

Space

Space

20ms

1 Frame=80ms

80ms

I1 ~ I8

Tx O UT

Note: OSC=455KHz

TRANSMISSION CODE WAVEFORM

The transmission waveforms of the Start Word and the different Data Words generated when a specific

input key (I1 ~ I8) is pressed are illustrated below (see also Transmission Code Pattern Section).

CLK

START

W1

W2

W3

W4

W5

W6

W7

W8

X

X

X=0.625ms

3X

1

0