Hi,
There is a 100k pull up resistor between CS and DVDD (R18). So, if CS is high, DVDD will be pulled up to some voltage.
Also, there are internal ESD diodes from the digital input/output pins to DVDD. So, again if DVDD is floating and there is a voltage on the digital input pins, it will feed through to DVDD via the diodes
Thanks and Best Regards,
Chris