Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2262
FUNCTIONAL DESCRIPTION
PT2262 encodes the code address and data set at A0 ~ A5 and A6/D5 ~ A11/D0 into a special
waveform and outputs it to the DOUT when TE is pulled to “0” (Low State). This waveform is fed to
either the RF modulator or the IR transmitter for transmission. The transmitted radio frequency or
infrared ray is received by the RF demodulator or IR receiver and reshaped to the special waveform.
PT2272 is then used to decode the waveform and set the corresponding output pin(s). Thus
completing a remote control encoding and decoding function.
RF OPERATION
CODE BITS
A Code Bit is the basic component of the encoded waveform, and can be classified as either an AD
(Address/Data) Bit or a SYNC (Synchronous) Bit.
Address/Data (AD) Bit Waveform
An AD Bit can be designated as Bit “0”, “1” or “f” if it is in low, high or floating state respectively. One bit
waveform consists of 2 pulse cycles. Each pulse cycle has 16 oscillating time periods. For further
details, please refer to the diagram below:
α
O SC
1 b it = 3 2
α
B it " 0 "
B it " 1 "
12
α
B it " f"
Flo a t ing
w h e re :
α
= O s c illa t in g C loc k P e rio d
4
α
4
α
PT2262 V3.8
-4-
September, 2008
PTC [ PRINCETON TECHNOLOGY CORP ]
