Welcome in the fascinating world of PSoCs!
Some considerations beforehand:
What is the needed accuracy and what is the required precision. What is the wanted conversion time and how many of that sensors do you wand to connect.
The analog DC input impedance is in the order of GOhms, so probably not an issue.
The resolution of the ADCs go up to 20bits, subtract some because you might not be able to use the full-scale.
Noise can be an issue, to when speed allows, you may averace measures.
Hope that helps!
Thanks a lot! I think I know how to verify it. Let me try it.