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Original question:

TIDA-00313: Recommended for high-side negative current monitoring chips(automotive grade)

TIDA-00313: Can INA226 be replaced by INA231?

Remy Zhang
Intellectual 920 points
Part Number: TIDA-00313
Other Parts Discussed in Thread: INA226, INA231

Tool/software:

Hi Team,

Two questions need to check with you about reference design TIDA-00313:

  1. Can INA226 be replaced by INA231 to save board area？
  2. After Vs and GND are powered by negative voltage, whether the input common mode voltage can only be negative? Can the minimum input negative voltage refer to the GND level or can it be lower than the GND voltage?

Best Regards,

Remy

  • 0
    TI__Mastermind 26185 points

    Hello Remy,

    Here are my responses to your questions:

    1. Yes, the INA231 can replace the INA226 in this design.

    2. The minimum input common mode voltage needs to be positive compared to the GND pin of the device. This can be negative compared to the system ground, if the GND pin of the device is also negative (as done in the TIDA).

    Regards,

    Mitch

  • 0 in reply to Mitch M
    TI__Intellectual 920 points

    Hi Mitch,

    Thanks for your reply! For the second question, when Vs & GND are powered by negative voltage, can IN+ & IN- of INA231 detect positive voltage? And also whether VBUS can be connected to positive voltage?

    Will it cause any current leakage if we connect IN+ & IN- & VBUS to positive voltage when Vs & GND both connect to negative voltage?

    Best Regards,

    Remy

  • 0 in reply to Remy Zhang
    TI__Intellectual 920 points

    And another question is how to determine the voltage sampling range (for example: INA226 common mode voltage range is 40V, GND power supply is -12V, is the sampling voltage range is -12V~28V?)

  • +1 in reply to Remy Zhang
    TI__Mastermind 26185 points

    Hello Remy,

    Here are my responses to your questions:

    Remy Zhang said:
    when Vs & GND are powered by negative voltage, can IN+ & IN- of INA231 detect positive voltage? And also whether VBUS can be connected to positive voltage?

    Yes, as long as the voltage is within the abs max range from the GND pin of the device.

    Remy Zhang said:
    Will it cause any current leakage if we connect IN+ & IN- & VBUS to positive voltage when Vs & GND both connect to negative voltage?

    No, this is fine, as long as all voltages are within spec compared to GND of the INA.

    Remy Zhang said:
    And another question is how to determine the voltage sampling range (for example: INA226 common mode voltage range is 40V, GND power supply is -12V, is the sampling voltage range is -12V~28V?)

    Yes, your understanding here is correct.

    Regards,

    Mitch