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SC5260-R2 Datasheet(PDF) 4 Page - Silan Microelectronics Joint-stock

Part No. SC5260-R2
Description  REMOTE CONTROL ENCODER
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Maker  SILAN [Silan Microelectronics Joint-stock]
Homepage  http://www.silan.com.cn
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 4 page
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Silan
Semiconductors
SC5260
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
4
FUNCTIONAL DESCRIPTION
SC5260 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. SC5270 (or SC5272) is then used to decode the waveform and set the corresponding output pin(s).
Thus completing a remote control encoding and decoding function.
1. RF Operation
1) Code Bits
A Code Bits 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:
1 bit = 1024
¢
128
¢
Osc
Bit "0"
Bit "1"
Bit "f"
Floating
¢
384
¢
128
¢
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:
1/8bit width= 128
¢
4 bit width = 4096
¢
Note: 1 bit = 1024
¢




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