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BQ24075: BQ24075 not work

Part Number: BQ24075

When the system is powered off, VBUS has power, Vdd and Vout have no power. I found that BQ24075 does not charge the battery, but when the system has power, that is, VDD can only be charged. The schematic diagram is as above, please help to analyze the reason? I've tried to put a pull resistor on sysoff to VBUS.