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ISO1540-Q1: Can the Gnd on one of the isolated sides be above zero potential.

Part Number: ISO1540-Q1

Hey there,

I am trying to isolate a circuit's I2C signals.

This circuit has a Gnd which is raised above 0V. The VCC is at 67V and the Gnd is raised to 62V.

will that pose a problem?

asking this cause I cant simulate the IC as only IBIS model is available.



  • Hi Abhijeet,

    Welcome to TI and thank you for reaching out to us with your question.

    Yes, the potential difference between GND1 and GND2 can be upto 566Vpk. Hence, 67V is not a problem provided all the other pins like VCC and SDA/SCL follow their recommended operating voltages with their respective GND. 67V at VCC when GND is 62V is valid input. Thanks.

    Koteshwar Rao