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ISO7841: how to build achieve isolated I2C function

Minqi Zhao
Intellectual 1660 points
Part Number: ISO7841
Other Parts Discussed in Thread: ISO7731,

Dear experts,

Could you kindly help to review this discrete I2C solution with ISO7841 as below and share some suggestions?(max17830 is another control signal) We referred to the ISO7731 solution as below.

  • 0
    TI__Guru 54245 points

    Hi Minqi,

    Thank you for sharing the schematic for review. The schematic looks good to me, could you please confirm the value of R43?

    I see that Q38 symbol is shown to be as a MOSFET but the part number MMBT3904 is a BJT transistor. Please do make sure all of the component part numbers match to the ISO7731 schematic above.

    I expect the above circuit to work fine without any issues but if you see any issues, then slightly increasing or decreasing R43 value the it should start working again. Thanks.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    TI__Intellectual 1660 points

    Hi Rao,

    Thanks a lot for your help.