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大家好。按道理说MIC BIAS引脚的电压是上电即有，无需配置的，但是我按照推荐连接电路设计，VDD,LDO,REF输出电压都是正常的，唯有MIC BIAS输出电压不正常，当万用表一放上去测，最开始是零点几伏，然后一直下降到0。
不存在虚焊问题，芯片也换了几块，请问是什么原因呢
