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BQ24650: Abnormal status of STAT1 pin of BQ24650

Part Number: BQ24650

When bq24650 run with a battery with 4.2V. The led connected to STAT1 is flickering when the voltage of battery is above 4.0V. When the voltage of battery is below 4.0V, the charge current is normal. I want to know why the STAT1 flicker? The waveform is as below.