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INA199A1 Reverse Current Sensing

William Schofield
Prodigy 60 points

When the current through the resistor is travelling from positive to negative I get the result that I expected which is the voltage drop across the resistor multiplied by the gain. In this case 0.05*2*50 = 0.5V. However when the current is travelling in reverse I get a seemingly random value of 84.14mV on the output pin. Why is is not 0.05*-2*50 = -0.5V?

  • 0
    TI__Genius 15760 points

    Hi William,

    You need to apply voltage to the REF pin. The ability to measure current flowing in both directions is enabled by applying a voltage to the REF pin, as shown in Figure 29 of the datasheet. Refer to the application section of the datasheet.

    Regards