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BQ24133 VREF引脚电压不正常



我在使用BQ4133这款芯片的时候,测试VREF引脚的电压是4.5V左右,手册中说应该是3.3V,换了几个片子都是相同情况,大家有遇到过吗?什么原因会造成这种现象?