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BQ25750: BQ25750的VSYS无法正常切换至VBAT供电

Part Number: BQ25750

电池组为8串磷酸铁锂(28.8V/20Ah),ACUV=13.5V,ACOV为40V,充电过程中断开DC24V输入源,VSYS无法正常切换至电池供电,测量BATFET栅极为脉冲打嗝,差不多1.3S一次。下面是原理图,寄存器配置为默认配置。请问那边需要调整。