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VRTC供电

Other Parts Discussed in Thread: TPS65910, AM3358, TPS65217

 

 看参考原理图 的VRTC供电部分 TPS71718供电,看了下TPS65910的手册其29管脚本来就提供VRTC电源,怎么还要额外加块片子呢?基于什么考虑?