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INA226-Q1: Calibration register setting is not resulting correct current, power numbers reporting

venkat kotha
Prodigy 10 points
Part Number: INA226-Q1

I have followed the equations 1) and 2)

Calculated current_LSB, CAL value..

loaded CAL value to register-5

But reported current on register read multiplied with Current_LSB doesn't seem correct

Appreciate suggestions how to fix it

  • 0
    Prodigy 10 points

    Cal = round( (0.00512 * (2**15)) / ( shunt_ohms * maxcur_amps) )

    Current_LSB = maxcur_amps/(2**15)

    load reg-5 with CAL

    Read reg-1 shunt-voltage

       RdData_S = RdData * 0.0025  ## mV

    Read reg-2 Bus voltage

     RdData_B = RdData * .00125  ## Volts

    Read Reg-3 Current

      Current = RdData * Current_LSB

    Read Reg-4 Power

       Power = RdData * 25 * Current_LSB

  • 0 in reply to venkat kotha
    TI__Mastermind 27590 points

    Hi,

    Sorry to hear that you’re experiencing trouble.

    In the code you provided about, could you please put some numbers to both the parameters (shunt_ohms, maxcur_amp…) and readings (RdData…)? It would be helpful if you can quantify why the readings don’t seem to be correct.

    Regards, Guang