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BQ24170电池供电问题,奇怪!

Other Parts Discussed in Thread: BQ24170

用BQ24170电池供电的时候,断开芯片AVCC的供电,电池供电正常,而且AVCC管教有6.5V左右的电压,难道电池供电的时候芯片的AVCC管脚没电压,也能正常工作吗?