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PT2260-R4 Datasheet(PDF) 5 Page - Princeton Technology Corp |
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PT2260-R4 Datasheet(HTML) 5 Page - Princeton Technology Corp |
5 / 16 page Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2260 V1.4 - 5 - April, 2006 Remote Control Encoder PT2260 FUNCTION DESCRIPTION PT2260 encodes the code address and data set at A0 ~ A7, A8/D3, A9/D2, D1 and D0 into a special waveform and outputs it to the DOUT when any of the data pins is tied to high. This waveform is fed to the RF modulator for transmission. The transmitted radio frequency is received by the RF demodulator and reshaped into the special waveform. PT2270 (or 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 512 oscillating clock periods. For further details, please refer to the diagram below: α 1 bit = 10 24 α 12 8 α 12 8 α 38 4 α OSC Bit"0 " Bit"1 " Bit"f" Flo a ting where: α=Oscillating Clock Period 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 w idth=128 α 4 bits w idth=40 96 α Note: 1 bit=1024 α |
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