Other Parts Discussed in Thread: BQ25883, BQ25882
When enable charge but battery is not connected. The waveform of bq25886 seems strange. The time axis is 40us. Why the SW switches for about 20us then stops for about 120us and repeat again? It may not be a charge and recharge process. Because the Deglitch time for recharge threshold and charge termination is about 250ms. It also may not be PFM. Because PFM at light load when battery is below minimum system voltage setting or charging is disabled. I watch the register. There is no fault and the charging state is CC fast charging. The Vsys and Vbat increases as charge voltage limit increases.