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28335的ADCREFP和ADCREFM输出电压正常是多少?

我测得的ADCREFP和ADCREFM分别是:1.292V和1.433V,我觉得我的输出电压值有一个不对吧?请问这是为什么?我估计是这个原因导致我AD采样老是算出1.5V。