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BQ24721电源管理芯片按照资料上的参考设计制板后未能工作



BQ24721电源管理芯片按照资料上的参考设计制板后未能工作,其中供电为25V,测试供电正常,11脚VREF5没有5v电压,SMBus通信不上。不知道问题出在哪儿。