When battery charging is enabled (CHG_CONFIG bit = 1 andCE pin is LOW), the device autonomously completes a charging cycle without host involvement. The device default charging parameters are listed in Table 8-2. The host configures the power path and charging parameters by writing to the corresponding registers through I²C.

A new charge cycle starts when the following conditions are valid:

• Converter starts
• Battery charging is enabled (CHG_CONFIG bit = 1 and I_CHG register is not 0 mA andCE is low)
• No thermistor fault on TS (TS pin can be ignored by setting TS_IGNORE bit to 1)
• No safety timer fault
• BATFET is not forced to turn off (BATFET_DIS bit = 0)

The device automatically terminates the charging cycle when the charging current is below the termination threshold, the battery voltage is above the recharge threshold, and the device is not in DPM mode or thermal regulation. When a fully charged battery is discharged below recharge threshold (selectable through VRECHG bit), the device automatically starts a new charging cycle. After the charge is done, toggle CE pin or CHG_CONFIG bit will initiate a new charging cycle. Adapter removal and replug will also restart a charging cycle.

The STAT output indicates the charging status: charging (LOW), charging complete or charge disable (HIGH) or charging fault (blinking). The status register (CHRG_STAT) indicates the different charging phases: 00-charging disable, 01-pre-charge, 10-fast charge (CC) and constant voltage (CV), 11-charging done. Once a charging cycle is completed, an INT pulse is asserted to notify the host.