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BQ27Z746: 该电量计带电待机几天无输出

Part Number: BQ27Z746

电压电流均校准了。装好单节锂电池待机了几天就没有输出了,电池还有不少电量。Pack+、-端加电压也无法打开MOSFET。Eable是51K电阻接地。I2C 的SDA、SCL均悬空。寄存器如图所示。几个样品均如此,无输出了。大多数reset能恢复,但其中一块板,Reset也无法恢复。不明白这种状态产生的机制,请帮忙解答一下。