To be honest, Dominik, I never ever cared for those internals and used the Cypress-components as-they-are. Since there is a bit more behind CapSense internally as IDACs, baselines and de-bouncing I tended to simply use the component. A challenging process might be to use a tuner for CapSense buttons to adapt their specs to the used layout and optimize the performance.
When you have got one of the development kits CY8CKIT-050, -044 or -042(BLE) you can have a look into the schematics at how the CapSense hardware components are connected.
If you want to pursue the deep dive file a CASE, the CapSense guys very knowledgeable
To create a technical or issue case at Cypress -
“Create a Case”
You have to be registered on Cypress web site first.
Since I need this for a project description I will open a case. :)