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CDCV850 데이터시트(PDF) 8 Page - Texas Instruments |
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CDCV850 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 20 page CDCV850 2.5-V PHASE LOCK LOOP CLOCK DRIVER WITH 2-LINE SERIAL INTERFACE SCAS647D − OCTOBER 2000 − REVISED APRIL 2013 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2-line serial interface 2-line serial interface slave address A7 A6 A5 A4 A3 A2 A1 R/W 1 1 0 1 0 0 1 0 Writing to the device is accomplished by sequentially sending the device address D2H, the dummy bytes (command code and the number of bytes), and the data bytes. This sequence is illustrated in the following tables: Start Bit Slave Address R/W Ack Ack Command Code Byte Count = N Ack Data Byte 0 Ack Data Byte 1 Ack Data Byte N Ack Stop 1 bit 1 bit 1 bit 7 bits 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 1 bit 8 bits 1 bit 2-line serial interface configuration command bitmap The 2-line serial command bytes are used to control the output clock pairs (Y[0:9], Y[0:9]). The output clock pairs are enabled after power up. During normal operation, the clock pairs can be disabled (set Hi-Z) or enabled (running) by writing the corresponding bit to the data bytes in the following tables: Byte 0: Enable/Disable Register (H = Enable, L = Disable) Byte 1: Enable/Disable Register (H = Enable, L = Disable) BIT PINS INITIAL VALUE DESCRIPTION BIT PINS INITIAL VALUE DESCRIPTION 7 3, 2 H Y0, Y0 7 29, 30 H Y8, Y8 6 5, 6 H Y1, Y1 6 27, 26 H Y9, Y9 5 10, 9 H Y2, Y2 5 − L Reserved 4 20, 19 H Y3, Y3 4 − L Reserved 3 22, 23 H Y4, Y4 3 − L Reserved 2 46, 47 H Y5, Y5 2 − L Reserved 1 44, 43 H Y6, Y6 1 − L Reserved 0 39, 40 H Y7, Y7 0 − L Reserved |
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