There would be no short term issues bringing up PVDD after AVDD and DVDD. For example it would be fine if they were 1 second apart or so, but it could hurt long term reliability to leave AVDD and DVDD high for extended periods of time.
The reference schematic indicate that AVDD, PVDD and DVDD can come up at the same time. Check out the reference schematic at
Do you want to sequence it for a reason?
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