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DS90UB933芯片使用3.3V IO电压时，芯片手册要求3.3V电压先于1.8V电压启动，由于该上电时序与SOC上电时序存在冲突，如果满足SOC上电时序：1.8V电压先于3.3V电压启动，是否会出现异常？
您好，在datasheet Page35有关于上电时序的介绍，VDDIO和VDD_n都为1.8V的时候将两个电压接在一起同时上电是可行的。
但是VDD_n不能先于VDDIO上电，也就是说如果VDDIO为3.3V的时候，1.8V不能先于3.3V上电呢。
The main constraint here is that the V(VDD_n) supply does not lead in ramping before the V(VDDIO) system supply.
Figure28的上电时序也说明了这点。
http://www.ti.com/lit/ds/symlink/ds90ub933-q1.pdf
