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BQ76940: Factory calibration parameters

Arati Lal
Prodigy 10 points
Part Number: BQ76940

Tool/software:

Dear TI expert,

According to the AFE datasheet, it is noted that factory calibration is performed at the TI side. Could you kindly clarify which specific parameters are calibrated during this process to ensure accurate results?

  • +1
    TI__Mastermind 35060 points

    Hello Arati,

    These are the GAIN and OFFSET factors (for cell measurements), which are detailed in Section 8.3.1.1.2 14-Bit ADC of the datasheet and are stored in the ADCGAIN and ADCOFFSET registers.

    Register descriptions are in the datasheet, I would recommend to read these carefully for instructions in how to use them.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 10 points

    Hi Luis H.S.,

    As per your guidance, I reviewed the detailed description of the GAIN and OFFSET values in the AFE datasheet. Additionally, when using the BQ evaluation software, I understand that I should be able to retrieve the raw ADC values along with the gain and offset for the specific IC.

    Could you please clarify whether these values remain consistent over time or if they tend to vary periodically?

    Best Regards,

    Arati Lal

  • 0 in reply to Arati Lal
    TI__Mastermind 35060 points

    Hello Arati,

    Arati Lal said:
    Additionally, when using the BQ evaluation software, I understand that I should be able to retrieve the raw ADC values along with the gain and offset for the specific IC.

    Correct. You can get both the raw values and the Gain/Offset factors from the GUI.

    Arati Lal said:
    Could you please clarify whether these values remain consistent over time or if they tend to vary periodically?

    These will remain the same over time and will not change. If you want it to change over time, there is a calibration suggestion in the Section 8.3.1.1.2.1 Optional Real-Time Calibration Using the Host Microcontroller of the datasheet.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 10 points

    Hello Luis,
    Thanks for your assistance.
    I have one more question. If I calibrate the AFE for testing purposes, is it possible to reset the calibration afterward? If so, could you please advise on how to perform the reset?

  • 0 in reply to Arati Lal
    TI__Mastermind 35060 points

    Hello Arati,

    The calibration would actually be done in the MCU side! The AFE will have stored values at all points, this will be unchanging. The MCU would use these stored values to perform the cell calculation.

    For calibration, you would generate a new calibration factor, which would be stored in the MCU. So you can change it as many times as you want. This is explained in the same section I pointed above.

    Best Regards,

    Luis Hernandez Salomon