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BQ34Z100-G1: Maximum Temperature to be sensed by an NTC (External Temperature)

Anvin Arackal
Prodigy 240 points
Part Number: BQ34Z100-G1

Hi,

What is the maximum temperature that can be sensed by BQ34z100-G1's External Temperature pins? Is it limited by the NTC Sensor Specifications or limited by the BQ34z100-G1 itself? 

I've not seen it cross beyond 120 °C. If I use an NTC with a maximum operating temperature of up to 300 °C, will it help to increase the range of the temperature sensing?

eg: NTC Part no. NRBG104J3435B2F
https://www.eaton.com/content/dam/eaton/products/electronic-components/resources/data-sheet/eaton-nrbg-glass-sealed-radial-lead-ntc-thermistor-datasheet-elx1105-en.pdf

Regards
Anvin

  • 0
    TI__Mastermind 27321 points

    Hello,

    The bq34z100-G1 is tested for the operating range -40°C to 85°C. 

    Using an NTC with a maximum operating temperature of up to 300 °C does not increase the range of the temperature sensing. As long as the NTC is used within the specified range by the bq34z100-G1, the gauge will respond fine.

    Please see below recommendations for the NTC



    Note: It is ideal to use a Negative Thermal Coefficient NTC, recommended by TI for the design, and to use the recommended coefficients to make sure that the temperature measurements are accurate.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 240 points

    Hello Jose,

    Thanks for the information. Is there any way to modify these coefficients or any other internal parameters to measure the temperature up to  300 °C? Is -40°C to 85°C a fixed limit? 

    Regards
    Anvin

  • +1 in reply to Anvin Arackal
    TI__Mastermind 27321 points

    Hello Anvin,

    The maximum operating range is -40°C to 85°C. Anything that falls outside causes gauging problems and inaccuracy. 

    Regards,
    Jose Couso