SLUSDK0A August 2020 – March 2021 BQ25171-Q1
When configured as a lithium battery charger, the device terminates a charge cycle when the OUT pin voltage is above the recharge threshold (VRECHG), and the current is below the termination threshold (ITERM). Termination is temporarily disabled when the charger device is in thermal regulation. After charge termination is detected, the linear regulator turns off and the device enters STANDBY state. Once the OUT pin drops below the VRECHG threshold, a new charge cycle is automatically initiated.
When configured as NiMH battery charger, the device terminates a charge cycle when the charge safety timer expires. If intermittent charging is enabled, a new charge cycle with 25% of original programmed timer duration will start once the battery voltage falls below VRECHG. For example, after a 20 hour charge cycle finishes, and then the battery falls below VRECHG, the device recharges the battery for 5 hours: (tINTERMITTENT = 25% x tSAFETY). If intermittent charging is disabled, the device will not start a new charge cycle automatically based on the VRECHG threshold. A toggle on the input supply or the CE pin is required to restart a charge cycle in this case.