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BQ20Z45-R1: PF Status

Yoshinobu Kagawa
Expert 2040 points
Part Number: BQ20Z45-R1
Other Parts Discussed in Thread: BQ20Z45

I have a question about PF Status for bq20z45-R1.

"This function is disabled if SOT1 Chg Time is set to 0." in bq20z45 Technical Reference.

But when I am set to 0, PF Status is set.

I attached EVSW capture and df settig data. .

Which function is correct ?

bq20z45-R1 PF Status.xlsx

  • 0
    TI__Mastermind 24870 points

    Hello Kagawa-san,

    Please allow us some time to look into this and we'll respond later this week.

  • 0 in reply to Kang Kang
    Expert 2040 points

    Hello Kang-san,

    How about this ?

  • 0 in reply to Yoshinobu Kagawa
    TI__Genius 10370 points

    Yoshinobu,

    Something seems a miss here. From the images i see all the cell voltages are approx. 1.1V. This is causing an SUV PF and i also see a AFE_C PF. Which is a communication error with the internal AFE. 

    I suspect there is a hardware issue causing measurement error or the very low voltage on the cell is causing the gauge to brownout again resulting is an incorrect temperature reading. 

    Lastly you also have a lot of RSVD bits set to 1 in PF Status 2 which tells me that you are not using the correct software to read the registers. Please delete your EVSW installation and re-install the correct EVSW for your version of the bq20z45-R1. When you run EVSW it shouls autodetect. 

    If it does auto detect please read the registers manaully via I2C to make sure EVSW is reporting them correctly.