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BQ40Z50: weak up after shunt down

Part Number: BQ40Z50

Dears

We have facing an issue after the device into shunt down mode, when battery voltage is very low, need 30s charge to weak up the device, but our charger have a battery detection method, which can not last for 30s. so need your help if there have some solution to weak up the device in this mode? like make the charge FET on in this condition?

Thanks

Jun Shen