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ISOW1412: A/B Bus Line resister

user5163865
Genius 4040 points
Part Number: ISOW1412


Tool/software:

Hi,

https://www.ti.com/lit/ug/sllu334/sllu334.pdf

Our customer is developing an isolated RS485 transceiver based on the above, but what purpose does the resistor on the A/B bus line in this document?
It's in series so it looks like a current limiting resistor.

Best regards,
Hiroshi

  • +1
    TI__Genius 9440 points

    Hi Hiroshi-San,

    Yes, that is correct. The Resistors are in series with TVS Diode to limit the current through TVS.

    This is recommended for high energy events like EFT and surge, where the diodes will help both in performance and protection.

    Regards
    Varun