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BQ76952: coulomb counter max error

Minqi Zhao
Intellectual 1660 points
Part Number: BQ76952

Dear expert,

My customer want to calculate the max current sense error from datasheet. Based on my understanding, the max error should be B(cc_inl).max+B(cc_dnl)/max+V(cc_off)/max+B(cc_gain).max+drift*delta T [LSB], is that right?

Look forward to your correction. Thanks.

  • 0
    TI__Guru 54715 points

    Hi Minqi,

    Basically yes. The errors are not from independent sources, they are all the CC, so you should add the contributions.  

    The CC is a delta-sigma converter, it is generally quite linear through the mid range near and rolls off some near the ends.  If you calibrate offset and gain midrange the error should be small through most of the range increasing near the ends.  If you calibrate at the ends there will be error throughout the range except at the calibration point.  Temperature effects will apply with or without calibration.