DRV8886: DRV8886 Ground Isolation

Part Number:DRV8886

Hello,

I can see in the DRV8886 datasheet two grounds (GND and PGND). As far as I can see PGND is the lower voltage of the H-Bridge but I still have the following doubts:

- Could I connect GND and PGND to separate grounds in my board? (grounds in my board are connected in only one point) I mean, Are GND and PGND isolated inside the driver?

-Which signals are referenced to each ground? (AVDD, DVDD, step, etc...)

Measuring the resistance between GND and PGND I can measure a DC resistance of 628 Ohms aprox., and that lead me to think that a kind of isolation exists between those pins.

Thanks in advance.

J.R.