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CDC906 датащи(PDF) 13 Page - Texas Instruments |
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CDC906 датащи(HTML) 13 Page - Texas Instruments |
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13 / 39 page ![]() www.ti.com Block Read Programming Sequence P S P SCLK SDATA A Bit 7 (MSB) Bit 6 Bit 0 (LSB) th(SDATA) tsu(SDATA) tsu(START) t(BUS) th(START) tr(SM) tr(SM) tf(SM) tf(SM) tW(SCLH) tW(SCLL) tsu(STOP) VIH(SM) VIL(SM) VIH(SM) VIL(SM) SMBus Hardware Interface 9 10 SDATA SCLK SMBHost CDC906 CBUS CBUS RP RP CDC906 SCAS828 – SEPTEMBER 2006 1 7 1 1 8 1 1 7 1 1 S Slave Address Wr A CommandCode A Sr Slave Address Rd A 8 1 8 1 8 1 1 Byte Count N A Data Byte 0 A - - - - - Data Byte N–1 A P Figure 10. Block Read Protocol Figure 11. Timing Diagram Serial Control Interface The following diagram shows how the CDC906 clock synthesizer is connected to the SMBus. Note that the current through the pullup resistors (Rp) must meet the SMBus specifications (min 100 µA, max 350 µA). If the CDC906 is not connected to the SMBus, then SDATA and SCLK inputs have to be connected with 10-k Ω pullup resistors to VCC to avoid floating input conditions. Figure 12. SMBus Hardware Interface 13 Submit Documentation Feedback |
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