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28335数字电源和模拟电源上电问题

       我的板子上28335的数字和模拟电源分别由两路开关电源得到, 一路是5V转3.3V 1.9V得到数字电源,一路是24V通过7812和7805再转3.3V 1.9V,这个是模拟电源,现在这两路开关电源不能同时上电,会影响DSP吗?那一路先上电比较好呢?

      求指点!谢谢!