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Use of digital isolator with two grounds shorted

Rohit Parashar0
Prodigy 45 points

I came across a design where the two grounds of isolator are connected with 0 Ohm resistance. I am just thinking why it is done so? and what is its use?

Regards.

  • 0
    TI__Intellectual 2325 points
    Hi Rohit,

    Thanks for using our E2E forum.

    Do you have a simplified schematic or block diagram to share ? Or could you please provide some additional context on what is being attempted in this application/design?
    That will help us provide a more informed answer.

    Thanks,
    Abhi
  • 0 in reply to Abhi Aarey
    TI__Intellectual 2325 points
    Hey Rohit,

    Just to follow-up here. Typically, we see high value resistors or high-voltage stitching capacitors (called Y-caps) to reduce common mode emissions across the ground domains. This is also done during debug stages to bypass the isolation barrier but to test the signal IO paths for example, or sometimes as a placeholder for future population of this board component.

    Hope this helps. Please feel free to post any follow-up questions or dive into this with more specifics if required.

    Regards,
    Abhi