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ISO7721-Q1: Shorting the two isolated grounds of Isolator damages the isolator or communications

Vasu Poojary
Intellectual 450 points
Part Number: ISO7721-Q1
Other Parts Discussed in Thread: ISO7721

Tool/software:

Hello Team,

We are using ISO7721 for CAN communication (digital side , connected to logic level of controller )  where two grounds are connected via switch .

In some use case , the ground switch is closed and other case  ground switch is open.

We are using ISO7721 to have seamless communication  in both case (ground short , ground open)

Does shorting of two ground will cause any damage to isolation barrier  or  any impact on communications ?

thanks

regards

Vasu

  • 0
    TI__Mastermind 18525 points

    Hi Vasu,

    Thanks for reaching out.

    Connecting the GND1 and GND2 essentially allows the signal to bypass the isolation barrier. This means that if the GND1 and GND2 are shorted, there will be no isolation between the side 1 and side 2 of the isolator. Just to clarify, we do not expect any damage to occur to the isolator when shorting the grounds together, assuming the recommended operating conditions are followed.

    If you would like to maintain isolation, we highly recommend keeping the GND1 and GND 2 separate and with respect to the side 1 and side 2 grounds.

    Regards,
    Aaditya V

  • 0 in reply to Aaditya V.
    Intellectual 450 points

    Hello Aaditya,

    Thanks for your input.

    Our main requirement is seamless communication when ground is disconnected , Isolation is not mandatory requirements

    Thanks

    Regards

    Vasu