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BQ76930: The setup at TS2 Pin

Hailiang Zhang
Expert 5805 points
Part Number: BQ76930
Other Parts Discussed in Thread: TIDA-01093

Hi Team,

Could you please help me with this case?

I saw there is a 3M resistor, R25, at TS2 pin in the SCH of TIDA-01093. what is the role?

Thanks and best regards.

HL Zhang

  • +1
    TI__Genius 11315 points

    Hey Hailiang,

    The resistor is there in case the user decides not to populate the thermistor header. The TS pins need a pull down resistor to the group reference is there is no thermistor installed.

    Thanks,
    Caleb

  • 0 in reply to Caleb Perez
    TI__Expert 5805 points

    Hi Caleb,

    Thanks for you answer. I guess a 3M resistor affect little when a thermistor is populated. But I notice that a 10k pull down resistor is recommend on the datasheet. What to consider if using 3M resistors? Does the AFE show low temperature when the thermistor is not populated?

    Regards，

    Hailiang

  • +1 in reply to Hailiang Zhang
    TI__Genius 11315 points

    Hey Hailiang,

    Unfortunately I have not tested that aspect of this design. My assumption is that the designers used a high value resistor so that a wide range of temp coefficients could be used when testing this specific board. 10K is recommended for designs where this is supposed to be no thermistor.

    Thanks,
    Caleb