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BQ27742-G1: Average Power Reading

Bhargav Jyoti Saikia
Intellectual 420 points
Part Number: BQ27742-G1

Hello,

I am using BQ27742-G1 fuel gauge with two INR18650-25R parallel cells and trying to read the power drawn from the battery. I am using the data command AveragePower()  0x76 and 0x77, but I am getting different values of power after two seconds or so. So, does it actually reads the instantaneous power? If not, over what time interval does it averages the power? And what is the sampling rate? I am bit confused because the command name is AveragePower(), but it is providing instantaneous values of power.

Please help to sort this out.

  • 0
    TI__Intellectual 1735 points

    • Hi,
    • What is the load you are using ? If the load changes during your test, the average power may also changes

  • 0 in reply to answer
    Intellectual 420 points

    Hi,

    I am using a standard 5 ohm - 10 A rheostat at 1 A discharge. Because the battery is almost fully charged (90%), the current is fairly constant at 1A. However the instantaneous value changes by little. But I expect the AveragePower() will average the different values of power over a time period and return the average value. That's why I asked about the sampling rate and the time over which the power is averaged? Am I wrong in this approach?

    Thanks!