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BQ25170J: BQ25170J

pooja v
Prodigy 60 points
Part Number: BQ25170J
Other Parts Discussed in Thread: BQ25170

Tool/software:

Hi ,

I'm using the BQ25170JDSGR PMIC in my project and I’m looking for some clarification regarding the TS pin configuration for temperature monitoring.

I would like to connect a 10kΩ NTC thermistor as shown in the attached screenshot (see below). My question is:

Can I connect the 10k thermistor to the TS pin in this manner, with a 33k resistor in series as shown?
Alternatively, is it acceptable to connect the 10k thermistor directly to the TS pin (without the 33k resistor)?

I’m trying to understand if the 33k resistor has a critical role in the voltage divider or protection circuitry that I might be overlooking.

Any insights, especially based on experience with the BQ25170 or similar PMICs, would be highly appreciated.

Thanks in advance for your guidance!

With regards..

Pooja.

  • +1
    TI__Guru* 75856 points

    Hello Pooja

    pooja v said:
    Can I connect the 10k thermistor to the TS pin in this manner, with a 33k resistor in series as shown?

    Bill J - I do not recommend this configuration with the 33k resistor.  TS pin is a 38uA current source to develop voltage across the NTC, easy to change the bias and hot / cold trip points.

    pooja v said:
    Alternatively, is it acceptable to connect the 10k thermistor directly to the TS pin (without the 33k resistor)?

    Bill J -- Yes this is common and not a problem.