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如图：Iret与MCU地连在一起，输出过一个50Ω电子与15v地连接在一起，mcu没有输出是测得输出端电压为2.1V,Iret对DGND电压在18V左右，我看网上以前问题，说Iret不能接地，Iret该怎么处理呢？
