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Digital isolator for CAN bus

Ray Vincent Aranzaso
Mastermind 18180 points


Hi,

Good Day.

When is a digital isolator needed for a board-to-board CAN bus? And why are they needed just when PCBs adopt different CAN transmitters?

>>> I found an application report with regarding to this query (https://www.ti.com/lit/an/slla486a/slla486a.pdf?)

How about other types of a bus are the same? For some time, if this applies for example to LVDS bus?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Expert 8030 points

    Hi Ray, 

    Thanks for reaching out.

    For a CAN Bus, isolation is typically needed for the following reasons:

    -To protect low voltage equipment and humans from high voltage surges

    -To tolerate large ground potential difference and disruptive ground loops in circuits that have high energy or are separated by a large distance

    For most communication interfaces, isolation is also needed for these reasons.

    Regards,

    Kenneth