Chapter 6: A closer look at controllers for capacitive touch sensors

In the previous chapters the readers are introduced to the basics of microcontrollers for capacitive touch sensors.

In this chapter, we’ll analyze an ideal touch sensing circuit, based on the charge transfer method. Then, we’ll give you an example that provides an intuitive explanation of how the controller uses counts to detect touch events. Finally, we’ll analyze some of the most important parameters you’ll come across when tuning a controller.