DEFAULT mode is used when I²C communication is not available. DEFAULT mode is entered in the following situations:

1. When the charger is enabled and V_BAT< V_BATGD before I²C communication is established
2. When the watchdog timer expires without a reset from the I²C interface and the safety timer has not expired.
3. When the device comes out of any fault condition (sleep mode, OVP, faulty adapter mode, etc.) before I²C communication is established

In DEFAULT mode, the I²C registers are reset to the default values. The 27-minute safety timer (no timer for BQ24168) is reset and starts when DEFAULT mode is entered. The default value for VBATREG is 3.6 V, and the default value for I_CHARGE is 1 A. The input current limit for the IN input is set to 1.5 A. The input current limit for the USB input is determined by the D+/D– detection (BQ24160/3) or PSEL (BQ24161/1B/8). PSEL and D+/D– detection have no effect on the IN input. Default mode is exited by programming the I²C interface. Once I²C communication is established, PSEL has no effect on the USB input. Note that if termination is enabled and charging has terminated, a new charge cycle is NOT initiated when entering DEFAULT mode.