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BQ78350-R1: How to set the FET temperature protection value?

Ken zhao
Prodigy 20 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ78350, BQ76930, BQSTUDIO,

Our solution is : bq78350+bq76930

bq76930 supports 2 thermistors. we set the TS2 to be theFET temperature sensor, by setting Temperature Mode=02. Then the FET Temperature=TS2 showing at Register.

You know the FET temperature is always higher than Cell temperature during DSG or CHG. 

But i don't know where to set the FET Temperature protection values by the bqstudio, there is only cell temperature protection settings, as OTC, OTD.

tks.

  • 0
    TI__Guru 54715 points
    Hi Ken,
    The bq78350-R1 has a method to use a thermistor for the FET temperature measurements, see section 2.4.1 of the technical reference manual, www.ti.com/.../sluubd3, but it does not have a protection for the FET temperature. The host would need to recognize the condition and reduce load or increase cooling in response.
  • 0 in reply to WM5295
    Prodigy 20 points

    Hi WM 5295,

    Thanks for your quick answer.

    I want to confirm that the FET and Cell temperature protection are using the same protection point during DSG and CHG?

    Tks.

  • 0 in reply to Ken zhao
    TI__Guru 54715 points
    Hi Ken,
    I see my answer was incorrect.
    The FET temp may be useful for the host, but in section 3.7.5 of the technical reference it does show the over temperature FET protection threshold (OTF). It is the same threshold for discharge or charge.
    The cell temperature is different between charge and discharge. See the technical reference section 3.7.1 and 3.7.2 for over temperature, sections 3.7.3 and 3.7.4 for under temperature.