这个是我从官网下载的原理图,不明白为什么将两路不同的电源电压接在一起给mcu。
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http://zhidao.baidu.com/link?url=OxlR_diE7KoRuW5mB3yRxpr14jiwpPy5T9fT6DGaksynwT-gd3FptwrOeu2oX02AhtT7pH-ODaYCP2_JCqgdNa