This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ24196: BQ24196 Charge termination voltage deviation is too large

Part Number: BQ24196

Dears,

   I am currently using the BQ24196 for charge and discharge management in my device. The registers I set are as follows, REG00=0X37; REG01=0X1E; REG02=0X49; REG03=0X11; REG04=0XC3; REG05=0X88;
At present, 6 boards with BQ24196 have been tested, and the Charge termination voltage(battery voltage) is 4.099V, 4.194V, 4.175V, 3.97V, 3.973V, 3.975V. I think this output voltage deviation is large, which has affected my subsequent power calculation. What do you think of this result?

  • Hello Martin,

    Couple things come to mind on this:

    1. Post-relaxation battery voltage is a function of termination current and cell impedance.If using different cells, are they fresh cells or aged cells? If aged, their internal impedance is different which will affect the time the charger remains in fast charge before transitioning to constant voltage mode making the cells reach different voltages after the relaxation period. It also would affect the
    2. If using fresh cells, verify the pack resistance from the output of the charger to the battery. Similar to case #1, if there is a significant IR drop along the charge path, it might force the charger into constant voltage prematurely

    Can you please confirm where are you measuring this voltage? At the output of the charger (BAT pin) or the cell voltage using a gauge. Also, do you have charge cycle logs of your tests?