Other Parts Discussed in Thread: BQ25121A, BQ25120F3A
In microcontroller applications, the watchdog timer is use to assure the host is still responsive and have not stopped operating. The BQ25120A has a 50-s watchdog timer that monitors the host through the I2C interface. The timer will reset every time an I2C communication is performed, in the case where the watchdog timer expired (host is unresponsive), the registers will reset to the default values.
The watchdog timer of the BQ25120A cannot be disabled. However, when the device is placed on High Impedance (Hi-Z) mode the watchdog timer is disabled. The device is on Hi-Z mode when operating out of battery and the /CD pin = LOW. As an alternative, the BQ25121A or the BQ25120F3A are part of the same family and have the watchdog timer disabled by default.
