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BQ769142: How does COV and CUV protection comparison work?

Ali Al-Hakim
Prodigy 20 points
Part Number: BQ769142

Tool/software:

Hi,

We're trying to understand COV and CUV protection accuracy error and are curious to get some more insight into when exactly the COV / CUV protection triggers and what values are involved in the comparison operation.

From our testing we often find the COV/CUV protection triggers AFTER the desired threshold by 10 mV to 30 mV. i.e. for a COV the voltage is often higher and for CUV the voltage is often lower.

To help us understand what's going on we hoped you could provide more insight into the comparison operation:

  1. What numbers are used in the comparison, LSB counts, converted floating point numbers, integer values, some other computed values? 
  2. Is the comparison a "greater/less than" or "greater/less than or equals to" operation, between the cell voltage and protection threshold?

Thanks
Ali Al-Hakim

  • 0
    TI__Genius 17795 points

    Hello Ali,

    Voltage calibration may help with improving the threshold accuracy of the comparators. You can follow Section 4.11 Voltage Calibration (COV and CUV Protections) in the technical reference manual to do so. The accuracy of the comparators for OVP and UVP are given in Table 7.26 Comparator-Based Protection Subsystem of the datasheet.
    The comparison is “greater/less than or equals too”.

    Best Regards,
    Alexis