GDF407芯片有个power switch电源选择开关,就是VDD与VBAT之间的这个电源选择开关,手册是这样说的VBAT range: 1.8 to 3.6 V, power supply for RTC, external clock 32 KHz oscillator andbackup registers (through power switch) when VDD is not present,是不是可以理解VDD的优先级大于VBAT呢,就是同时存在时优先VDD呢?
VBAT range: 1.8 to 3.6 V, power supply for RTC, external clock 32 KHz oscillator andbackup registers (through power switch) when VDD is not present.这句话翻译过来就是VBAT范围是1.8-3.6V,当VDD没有使用的情况下VBAT供电给RTC、32KHZ的外部时钟晶振和备份寄存器通过电源开关,这话中非常明确VDD不存在时,其实可以说VDD存在时会优先VDD