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Original question:

BQ34Z100-G1: GPC optimization issue - Error: negative low temperature resistance

BQ27542-G1: GPC optimization issue - Error: negative low temperature resistance

yuan chuan zheng
Prodigy 80 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: GPCCHEM, GPCRB

Dear all :

      My question:

     The following errors were reported by the calculation engine:
    Error: negative low temperature resistance observed, R=-1.61973095533587 usually caused by wrong chem ID selection 0 0

Is here any one can tell me how to do?

chem id:0188

Package which I uploaded:

bq27542g1-temp_compensation.zip

  • 0
    TI__Genius 14985 points
    This means that the loaded voltage was higher than the OCV (unloaded open-circuit voltage) of chemID 188 at some point during the low temp discharge. If GPCCHEM gave you other chemIDs which were also reasonable matches, you can try to run GPCRA and GPCRB with those chemIDs instead and see if you do not get the error. You can also try to use a slightly higher current during the low temp discharge to ensure the voltage drops below the OCV voltage.