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BQ24133的VREF电压有3.89V,无法充电



条件:12V输入,2节串联锂电池。 

开始正常完成了一次充电。后来就不正常了,量得VREF为3.89V,OVPSET为1.0V。正常的时候VREF应该为3.3V,请问一下是什么原因导致VREF不正常?