LTC4162-L recommend DVcc connection

What is the recommendation for DVcc.

Can I leave this unpowered?

The Data Sheet states that SCL/SDA must be high when the bus is npt in use.

But a post on the forum suggests they can be left floating.

Can they be pulled to DVcc and DVcc be powered down for standalone operation.

This is not clear to me in the LTC4163-L datasheet.

Thanks

Phil