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PT2264 v1.0

- 4 -

June, 2004

Remote Control Encoder IC

PT2264

FUNCTIONAL DESCRIPTION

PT2264 encodes the code address and data set at A0 ~ A7 and A8/D3 ~ 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 for transmission. The transmitted radio frequency is received by the RF

demodulator receiver and reshaped to the special waveform. PT2294 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:

1 bit = 32

4

12

4

where:

= Oscillating Clock Period

OSC

BIT 0

BIT 1

BIT f

Floating

Synchronous (Sync.) Bit Waveform

The Synchronous Bit Waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below:

1/8 bit width = 4

4 bit width = 128

Note: 1 bit = 32