The device has a built-in safety timer to prevent an extended charging cycle due to abnormal battery conditions. The safety timer is 20 hours when the battery voltage is above V_{BAT_LOWV} threshold and 2 hours when below V_{BAT_LOWV} threshold. When the safety timer expires, charge is suspended until the safety timer is reset. The safety timer is reset and charge starts under one of the following conditions:

• Battery voltage falls below recharge threshold
• VBUS voltage is recycled
• EN pin is toggled
• Battery voltage transits across V_{BAT_SHORT} threshold
• Battery voltage transits across V_{BAT_LOWV} threshold

If the safety timer expires and the battery voltage is above the recharge threshold, the charger is suspended and the STAT pin is open. If the safety timer expires and the battery voltage is below the recharge threshold, the charger is suspended and the STAT pin blinks to indicate a fault. The safety timer fault is cleared with safety timer reset.

During input current regulation, thermal regulation, the safety timer counts at half the original clock frequency and the safety timer is doubled. During TS fault, V_{BUS_OVP}, V_{BAT_OVP}, ICHG pin open and short, and IC thermal shutdown faults, the safety timer is suspended. Once the fault(s) is clear, the safety timer resumes to count.