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BQ76952: Temperature measurement calibration issue

Rahul Sharma
Intellectual 320 points
Part Number: BQ76952

Tool/software:

Dear TI Expert, 

Product Based on BQ7695202 IC and 18K Pullup.

we are attaching our NTC Details, Details Parameter of Coefficients Calculation, Coefficient Value Provide via TI GPC Tool and Test Report.

our observation as follows:

Correct Temperature Measurement achieved -15 to 7 degree is correct and  7 to 62 degree is wrong.

Please suggest how to get required coefficient for correct measurement for a range -30 to 100 degreeNTC-report.zipNTC.zipRT DATA 10K 5%.pdfTemperature Result.xlsx

  • 0
    TI__Genius 17755 points

    Hello Rahul,

    Do you need the full accuracy range? The accuracy can be improved if the temperature range is narrower. 

    Here is the image generated with the range from -30 to 100 degrees. 


    Here are the coefficients given for it: 
Search complete, bestmaxerr =  0.19999999999998863
bestA [A1 A2 A3 A4 A5] =  [-17995  31696 -27449  31679   1343]
bestB [B1 B2 B3 B4] =  [-1944  2666 -3440  4423]
Adc0 = 11703


    Best Regards,
    Alexis