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INA219: About setting Currenct_LSB

Toshiyuki
Mastermind 7075 points

Part Number: INA219

Hi,

Would you tell me the recommended value of Current_LSB for the Calibration Register as following condition?

・Maximum Expected Current : 40mA

 *Current range 4mA～40mA

・RSHUNT : 0.33Ω

Best Regards,

Toshiyuki

  • 0
    TI__Mastermind 32395 points

    Hello Toshiyuki,

    Thanks for your interest in INA219. Anyway, Section 8.5.1 of the datasheet explains how to calculate the best/optimal value of the Current _LSB. Simply divide your maximum expected current by 2^15. 0.04A/2^15 = 1.2207uV.

    You can take this one step further and round up this number up to nearest round number to simplify converting the Current Register and Power Register values in your firmware or during post processing. For your case, if you round Current_LSV to 2uV, then converting the decimal reading of the Current and Power registers becomes more simple.

    Sincerely,
    Peter Iliya

    Current Sensing Applications