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INA211: Minimum current that can be measured

Chandrashekhar D R
Prodigy 10 points
Part Number: INA211

Hi Team,

How to calculate what is the minimum current that can be measured using the INA21x Solution ?

  • 0
    Guru 281870 points

    This device just measures the voltage drop over the shunt resistor. The inputs have a worst-case offset voltage of ±35 µV, so so the minimum voltage drop should be larger than that.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Hi Clemens,

    Thanks for the input.

    Have one more Query, in data sheet they have given like "Enables Shunt Drops of 10-mV Full-Scale".

    What does it mean? Whether the shunt drop should be minimum 10mV to get the better readings? Below image shows the data.

  • 0 in reply to Chandrashekhar D R
    Guru 281870 points

    Typical shunt resistors are larger, with something like 100 mV at full scale. The low offset voltage of the INA211 allows smaller shunt resistors.

    With a full-scale voltage of 10000 µV, the 35 µV offset would result in an error of 0.35 %.

    The datasheet specifies no minimum. You have to decide yourself what error you can accept.

  • 0
    TI__Expert 3990 points

    Hi Chandrashekhar,

    Thanks for the question and using the E2E forum.

    Along with the responses from Clemens (thanks Clemens!), here's a video we've put together that should help in picking an appropriate shunt resistor for your application.

    Please let us know if you have any other questions.

    Louis