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INA250: How to connect SH+/- and VIN+/-

Sadanori Kato
Guru 36540 points
Part Number: INA250


Hi,

According to INA250 data sheet, "SH+ and VIN+" and "SH- and VIN-" should be connected, but is it possible to connect "SH+ with VIN-" and "SH- with VIN+" as follows?
Is my understanding correct that INA250 current-sense amplifier can be configured to measure bidirectional currents through the reference voltage level applied to the reference pin?
If yes, are there any concerns if these signals are wired on the back side of the board?

Best regards,
Kato

  • 0
    TI__Mastermind 35140 points

    Hi Kato-san,

    Yes your understanding is correct that INA250 can be configured to measure bidirectional currents through the reference voltage level applied to the reference pin.

    It is possible to connect "SH+ with VIN-" and "SH- with VIN+" as proposed, functionally there is no difference other than polarity. However each device is individually trimmed and tested with the default connection to achieve optimal system level performance. When cross connected as proposed, it is possible that some devices’ offset and gain error spec might slightly degrade. As a result unless there is a compelling reason, I would stick with default connections.

    Regards, Guang

  • 0 in reply to Guang Zhou
    Guru 36540 points

    Hi Guang-san,

    Thank you for the detailed information.

    I understand.

    Best regards,
    Kato