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SN65HVD1782-Q1: Applied to SPI communication(4-wire)

Shotaro Sakai
Expert 3410 points
Part Number: SN65HVD1782-Q1
Other Parts Discussed in Thread: SN65HVD10

Hello team,

  1. Three inputs for SPI communication are required, so "one line driver receiver" and "two line receivers" will be implemented. Is it common to use multiple line drivers and line receivers together for SPI communication? (He is concerned about the timing of the input signals such as SPI communication clocks and chip selects.)
  2. Do we have min value for  tPLH and tPHL?
  3. How much variation does tPLH and tPHL have in each IC when multiple line receivers are implemented on the same board? For example, when two line receivers are implemented, one IC has very large value and another has min value?

Best regards,

Shotaro

  • +1
    Guru 317280 points

    The most common way to use differential signaling for SPI is with LVDS, not RS-485. Anyway, LVDS is used for higher speeds, while RS-485 is used for longer distances and in noisier environments, so using RS-485 for SPI can work, too. What distance and speed are required?

    In general, one would use quad transmitters and receivers for SPI, but it is hard to find ones with Q1 rating.

    The device-to-device skew is not specified. A high skew is unlikely, but there is no guarantee.

  • +1
    TI__Mastermind 25705 points

    Shotaro,

    Echoing Clemens comments, the main applications of RS-485 are industry not communication. Therefore unfortunately the data in your inquiry are not available. The only device  specified with the part to part skew is SN65HVD10