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SC5272S-L4 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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SC5272S-L4 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 12 page Silan Semiconductors SC5272 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 5 The Synchronous bit waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below: 1/8 bit width=4a 4 bit width=128a Note: 1bit =32a Code word A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync. Bit. The 12 AD bits are interpreted as either address or data bits depending on the SC5272 version used. Please refer to the diagram below: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC Single Resistor Oscillator The Build-in oscillator circuitry of SC5272 allows a precision oscillator to be constructed by connecting an external resistor between OSC1 and OSC2 pins. For SC5272 to decode correctly the received waveform, the oscillator frequency of SC5272 must be 2.5 ~8 times that of transmitting SC5262. It is a good practice to center the SC5272 oscillator frequency in the window to gain best window margin at both sides. The typical oscillator frequency with various resistor values for both SC5262 and SC5272 are shown below: 0 3 6 9 12 15 1 10 100 Supply Voltage (V) Encoder OSC Frequency 0 3 6 9 12 15 1 10 1000 Supply Voltage (V) Decoder OSC Frequency 100 R=510k R=1M R=3.3M R=4.7M R=100k R=240k R=510k R=1M R=2M R=2M Suggested Oscillator resistor values are shown below: 4.7M 820k 3.3M 1.2M 680k 200k SC5262 SC5272 |
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