Tell me why connect the load to the VSSA?
I can't quite understand what you want to do.
As you know, VSSA must be connect to the Ground.
Please, do not be made to mention
I want to bring out analog GND of PSoC to a sensor!
I heard that GND on PCB and in PSoC are a bit different.
Or am I wrong?
From the datasheet -
Note The Vref component is not intended to source or sink current. It has low drive strength. If
high drive strength is needed, buffer the Vref with an Opamp or PGA component.
Vssa is pinned out on the package.