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PMIC在PCB设计时走线过细，导致am5728端口VDD_MPU、VDD_MPU端电压会升高，am5728在启动时候内核崩溃
1）VDD_MPU、VDD_MPU的电压能不能外接其他电源供电？
2）am5728在内核供电电压最高多少呢
