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THVD1450: Please help to check the resistor value

Leo Yang
Expert 3385 points
Part Number: THVD1450

Hi team,

Here is the SCH for THVD1450. Could you help to check the SCH and let me know the resistance for R9007?

Thanks,

Leo

  • +1
    Guru 270600 points

    Looks OK.

    A RS-485 bus should have exactly two termination resistors, at the two ends of the bus.

    When the transceiver is at one of the two ends of the bus, the termination resistor should have the same value as the characteristic impedance of the cable; this is typically 120 Ω. When the transceiver is at another place on the bus, then it should not have a termination resistor.

  • 0
    TI__Guru 56560 points

    Hi Leo,

    Clemens is correct. Please let us know if you have any follow up questions.

    -Bobby