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BQ76930: External Temperature Accuracy Calculations

Antonio Fadhel
Genius 9410 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350

Hi team,

My customer is working on temperature accuracy calculations for the BQ76930. The datasheet states the following:

and

Using the BQ78350 coefficient calculator:

His questions are:

Is R_TH =18000 calculated using the equations in the first cut and paste?
Since the accuracy of the internal 10K resistor is +3% how is that put into the calculator? Would I set tolerance to 3% for R_TH of the calculator? Is this the correct way to compensate for internal accuracies?

Can you please provide feedback?

Thanks,

Antonio

  • 0
    TI__Guru 54715 points
    Hi Antonio,
    See the instructions in the spreadsheet for the calculator. Typically only the yellow boxes are changed.
    The R_TH 18000 is built into the parameter algorithm and is not typically changed. The correction for the 10k vs 18k is built into the bq78350 firmware.
    Tolerance on R_TH does not change the coefficients, if you wish to see the expected tolerance from changing the tolerance you can apply the values from the bq76930 data sheet. Using a % so the R_TH is not a concern.