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BQ27542EVM: BQ27542-G1: SOC Accuracy tolerance??

Iris Tsai
Prodigy 200 points
Part Number: BQ27542EVM

Tool/software:

Hi Sir

We have successfully completed the learning cycle.
Cell capacity =2800, Remaining capacity=600mAh , why is bq27542 SOC= 16~27%?

EX:

OCV (V)

SOC (%)

3.77 V

16 %

3.77 V

18 %

3.77 V

22 %

3.77 V

25 %

3.77 V

27 %

Thanks.

  • 0
    TI__Mastermind 25225 points

    Hello Iris,

    These results can be expected depending on your cell since the OCV of lithium based cells is very flat in the middle, thus why impedance tracking uses coulomb counting, Ra table, simulation, chemID and etc to best determine the SOC. Can you send a .log file to see what other factors may be causing the SOC to increase.

    Thank you,
    Alan