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BQ25101 Charging Profile

Other Parts Discussed in Thread: BQ25101

Hello everybody.

I am making a circuit which using BQ25101 IC to charge my battery. Here is schematic of the circuit.

In which, CHG' pin (active low) is connected to a pin of an MCU to know the battery is charging or not. After reading the datasheet of BQ25101, I have a question:

Is CHG' on during T_prechg or is CHG' on only during T_chg ?