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PT2270-L3

Remote Control Decoder IC

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Remote Control Decoder IC

PT2270

FUNCTION DESCRIPTION

PT2270 decodes the waveform received and fed into the DIN pin. The Waveform is decoded into code

word that contains the address, data and sync bits. The decoded address bits are compared with the

address set at the address input pins. If both addresses match for 2 consecutive code words, PT2270

drives -- (1) the data output pin(s) whose corresponding data bit(s) is then decoded to be a “1” bit, and

(2) the VT output -- to high voltage (high state).

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

OSC

BIT 0

4α

1 bit = 32α

BIT 1

12 α

4α

BIT "f"

Floating

Where:

1. α=Oscillating Clock Period

2. Bit “f” is only available for address bits

SYNCHRONOUS (SYNC.) BIT WAVEFORM

Note: 1-bit=32α

1/8 b it w idth =4 α

4 bit width=128α

PT2270 V1.3

-5-

May, 2006

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