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Original question:

INA226: Shunt Measurement Tolerance Analysis Help

Where is "the online calculator tool on the INA226 product page for this purpose as well. "?

N Maris
Prodigy 210 points
Part Number: INA226

Hi where is "the online calculator tool on the INA226 product page for this purpose as well. " mentioned in this case? I can't find it on the page. Thanks.

  • 0
    TI__Mastermind 27715 points

    Hello N,

    Unfortunately the error calculators were taken down by mistake from our digital current sensor pages. We are aware of the issue and working to get them restored as quickly as possible. I apologize for the inconvenience.

    In the meantime, I am happy to assist you with a particular error calculation if you provide me with the circuit conditions.

    Best regards,

    Ian Williams
    Applications Manager
    Current Sensing

  • 0 in reply to Ian Williams
    Prodigy 210 points

    Hi Ian thanks. How is the gain error for INA226 calculated? It is listed as 0.1% or 1/1000th, but how is the gain determined for it? Assuming perfect 2 ohm sense resistor (40.96 mA FS). Thanks.

  • 0 in reply to N Maris
    TI__Mastermind 27715 points

    Hi N,

    The gain error is calculated the same as for an analog output device, but looking at output register codes instead of output voltage. To test this, two different known differential input voltages are applied, for example 10mV and 50mV. The shunt voltage register is read at each level. The results are compared to the ideal, from which we can determine both offset and gain error using the standard first-order linear equation: output = gain * input + offset. 

    Since there is no gain stage in the INA226, these errors are caused by non-idealities in the ADC and input sampling network.

    Best regards,

    Ian Williams

  • 0 in reply to N Maris
    TI__Genius 16430 points

    The error tools have been reinstated for the digital power monitor products - including the INA226.