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BQSTUDIO: Current Calibration trouble

Gorka Lorea
Expert 1620 points
Part Number: BQSTUDIO
Other Parts Discussed in Thread: BQ34Z100-G1

Hi,

I am using a BQ34z100-g1 with an 8s2p LiFePO4 batteries. The nominal capacity of the battery is 3200mAh.

I have obtained the golden image of the battery and now I am loading it in the phase of production of the device. But I am encountering a lot of problems with calibration current in the new version of bqStudio 1.3.86.3. I have checked 1.3.92.3. version and has the same performance. (1.3.54.1.version was significantly faster than these newest versions).

The average current shown in the box gauge  has a very slow filter. It takes more than 7-8 seconds to raise from 0mA to -2000mA

- When is it recommended to pulse the button "Calibrate Gas Gauge"?Is it necessary to wait until the value in gauge box stabilized? Or this is just a guide and the bqStudio works with other value (one without such a high filter)?

- Which is the method that Texas Instrument recommend for loading golden image and calibrate bq34z100-g1 in production phase?

I can not believe that bqStudio is the best way to do it. (it is an unstable and slow program) 

 

Best regards,

  • 0
    TI__Mastermind 24870 points

    Hello Gorka,

    During calibration, there is a slow filter. I would recommend after calibration to perform a test as follows.

    1. Use the "start log" button at the main screen.

    2. Apply the current

    3. Look at AvgCurrent() and see how long it takes to converge to the value.

    The time filter is normal, we do expect some type of delay prior to AvgCurrent() settling to the DC value. However, it is better to look at Qpass() in order to see the accumulated charge accuracy.