Questions about ad5940 power up sequence

I am using AD5940 for wearable equipment.
To minimize battery consumption, it is controlled by turning the power on or off.
At that time, communication with the AD5940 is not possible.

Of course, I know HIBERNATE mode, but I'm trying to proceed with power control first.

Looking at the datasheet, I can't find anything about the power-up sequence.

Please answer my question.

Thank you.