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SC5272D-M1 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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SC5272D-M1 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 12 page Silan Semiconductors SC5272 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 4 PIN DESCRIPTION Pin No. 18 PIN 20 PIN Pin Name I/O Description 1~6 1~6 A0~A5 I Code Address pins No. 0~5. These six tri-state pins are detected by SC5272 to determine the encoded waveform bit 0 ~bit 5. Each pin can be set to “0”,”1”,”f”(floating). 7~8 10~13 7~8 12~15 A6/D5~A11/D0 I/O Code Address pins No.6~11/data pins No.5~0. These six pins are used higher address input bits or data output pins depending on the versions of SC5272 used.When these pins are used as address pins, they are tri-state input pins and can be set to “0”,”1”,”f”.When they are used as output pins, they are driven to Vcc if (1) the address decoded from the waveform that was received matches the address setting at address input pins, and (2) the corresponding data bits received is a “1” bits. Otherwise, they are driven to Vss. 14 16 DIN I Data Input Pin. The encode waveform received is serially fed to SC5272 at this pin. 15 17 OSC1 I Oscillator pin 1 16 18 OSC2 O Oscillator pin 2 A resistor connected between these two pins determine the fundamental frequency of SC5272. 17 19 VT O Valid Transmission. Active high signal. VT in high state signifies that SC5272 receives valid transmission waveform. 18 20 Vcc -- Positive Power Supply 9 9 Vss -- Negative Power Supply -- 10~11 NC -- No Connection FUNCTIONAL DESCRIPTION The SC5272 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, SC5272 drives: a). The data output pins whose corresponding data bits is then decoded to be a "1" bit b). The VT output --to high voltage (high state). 1. 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. 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 two pulse cycles. Each pulse cycle has 16 oscillating time periods. For further details, please refer to the diagram below: a 4a 12a 12a 4a 32a OSC bit "0" bit "1" bit "f" Where: a = oscillating clock period . Bit “ f ” is only available for address bits. |
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