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D1就是EVM板使用的PD信号源,在LOG114EVM User Guide 中 3.3 Using a Photodiode章节讲了它的连接方法。EVM中绘制的D1的PCB封装是两种封装,即一个是贴片PD封装,一个是插件PD封装,使用哪种封装的PD都可以焊接上。
在原理图中D1就是一个2pin的PD 二极管。