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BQSTUDIO: Can't enter CC Gain value in BQStudio

Malo M1
Prodigy 90 points
Part Number: BQSTUDIO

Hello,

I try to initialize the BQ27750 present on my custom board in order to measure the remaining capacity of my Battery in real time. On my board, there is a 10mOhms shunt resistor.

I have followed the "CC Gain/Capacity Gain Calibration" procedure described in the 10.3.3 (page 47) section of the BQ27750 Reference Manual (sluubi6a). After some measurements, I find a CC Gain of 0.000315 (with Icc = 105mA and ADCcc = 333).

But I can't enter this value in BQStudio and I don't know what value I should enter. Could somebody please help me ?

Thanks.

Regards.

Malo

  • 0
    TI__Guru* 76230 points

    Hi Malo

    Is your gauge measuring a current value when the actual current flow is 0mA. If that is not the case, then there is no need to perform a cc or board offset calibration. The gauge performs auto cc calibration before going into sleep mode. So there really isn't a need for the cc or board offset calibration, that is why it is not existent in bqstudio

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 90 points

    Hi Onyx,

    I don't have problem when the current flow is 0mA.

    The problem occurs when battery is charging and I try to measure a current (per example 50mA actual current flow and the gauge measure a value of 570 mA). That's why I tried to calibrate the CC Gain and the Capacity Gain with the procedure "10.3.3 CC Gain / Capacity Gain Calibration" of the BQ27750 reference manual.

    The default value on BQ Studio is 1.036 for CC Gain and Capacity gain.

    Thanks for your answer.

    Malo

  • 0 in reply to Malo M1
    Prodigy 90 points

    Does anybody know how I can get a reliable current measurement with the BQ27750 ?

    Thanks.

    Malo

  • 0 in reply to Onyx Ahiakwo
    Prodigy 90 points

    Hi,

    My problem was that I was trying to calibrate current with a current flow lower than 100mA.

    Thanks for yout help.

    Malo