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BQ76952: The temperature test range and error

Fabio Gou
Expert 4445 points
Part Number: BQ76952

The customer want to test the temperature from -40℃ to 125℃, and the error are within 3℃。

1. Whether BQ76952 support to measure temperature from -40℃ to 125℃?

2. In the whole temperature range, whether we can guarantee 3℃ error in the full temperature range after calibration?

  • 0
    TI__Mastermind 25980 points

    Hi Fabio,

    Going through your questions:

    1. Whether BQ76952 support to measure temperature from -40℃ to 125℃?

    The BQ76952's recommended operating temperature is from -40°C to 85°C, beyond that TI cannot guarantee the performance of the device.

    2. In the whole temperature range, whether we can guarantee 3℃ error in the full temperature range after calibration?

    See Figure 16-4: Thermistor Temperature Error of the datasheet. The results may differ based on the customer's thermistor.

    I hope this helps!

    Regards,

    Max Verboncoeur

  • 0 in reply to Max Verboncoeur
    TI__Expert 4445 points

    I guess this is the error before calibration, is it right?

    Can temperature calibration help improve the performance in the below?

  • +1 in reply to Fabio Gou
    TI__Mastermind 25980 points

    Hi Fabio,

    I believe that these measurements were taken with all default settings, so the accuracy should be able to be improved by taking the ADC0 value and offset at room temperature and loading those values into the appropriate data memory locations.

    Regards,

    Max Verboncoeur

  • +1 in reply to Max Verboncoeur
    TI__Mastermind 25980 points

    Hi Fabio,

    Allow me to provide additional clarification to my initial answer.

    The BQ76952 can measure 125°C from an external thermistor. As long as the IC temperature remains within the -40~85°C range, then there is no issue with measuring external temperatures from -40 to 125°C.

    I apologize for any confusion.

    Regards,

    Max Verboncoeur