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76940 CHG 和DSG引脚被拉低



76940程序初始化时CHG和DSG是开启状态,但是实际测到电压为0;

将这两个引脚从电路断开,不改程序,测到电压是13.5V,此时将断开的引脚再连接到电路,大MOS FET可以被打开,充电正常;

将其中一个引脚断开,另一个不断开,启动后两个引脚的电压都是0v;

请问这是为什么?附件是原理图!