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BQ24257RGET TS Fault when connecting Temp Pin of the battery

ahmed benslama
Prodigy 80 points

i have used the BQ24257RGET for a new design, i have problem when i connect the temperature pin of the batery , the charging is stopped when i connect it ( i see in register that i have temp problem) i have make a resister divider of 20 K and 20K like the evaluation board.

Remarque : Our battery have 10K ohm impedance between Temp pin and the ground , is it normal?

  • 0
    TI__Guru**** 166576 points
    Please use the excel spreadsheet at www.ti.com/.../sluc436 to properly size the resister divider for your thermistor. Datasheet section 10.3.5.5 starting on page 25 explains how the resistors work with the thermistor.
  • 0 in reply to Jeff F
    Prodigy 80 points

    Hi Jeff ,

    Thanks for your response.

    With specification of my battery a have changed resistors for 12 K and 6 K and its works , i haven't problem when i connect the TS pin.

    But when i heat the battery over 50°C the charging is stopped ===> OK

    and i read "AA" in Register #6 Memory location: 05 , it was A8 when charging 

    In Register #1 Memory location: 00 i read "20" and battery not full , it was "10" when charging and i'm waiting for "43"

    Could you please explain me 

  • 0 in reply to ahmed benslama
    TI__Guru**** 166576 points
    What is the battery voltage when this occurs? Using the JETIA standard, the VBATREG voltage is lowered from 4.2V to 4.06V. If V(BAT)=4.06V then the charger will think the battery is charged.