8.3.7.1 Autonomous Charging Cycle

When battery charging is enabled (EN_CHG bit =1 and /CE pin is LOW), the device autonomously completes a charging cycle without host involvement. The device default charging parameters are listed in the table below. The host can always control the charging operation and optimize the 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 by I²C register bit (EN_CHG = 1 and CE pin is LOW and ICHG register is not 0 mA)
• No thermistor fault on TS
• No safety timer fault

The charger device automatically terminates the charging cycle when the charging current is below termination threshold, charge voltage is above recharge threshold, and device is not in DPM mode or thermal regulation. When a full battery voltage is discharged below recharge threshold (threshold selectable via VRECHG[1:0] bits), the device automatically starts a new charging cycle. After the charge is done, toggle either CE pin or EN_CHG bit can initiate a new charging cycle.

The status register (CHRG_STAT) indicates the different charging phases as:

• 000 – Not Charging
• 001 – Trickle Charge (VBAT < V_{BAT_SHORT})
• 010 – Pre-charge (V_{BAT_SHORT} < VBAT < V_{BAT_LOWV})
• 011 – Fast-charge (CC mode)
• 100 – Taper Charge (CV mode)
• 101 – Top-off Timer Active Charging
• 110 – Charge Termination Done

When the charger transitions to any of these states, including when charge cycle is completed, an INT is asserted to notify the host.