TSI Methods
KE15Z Touch Sensing Interface, User's Guide, Rev. 0, 12/2016
2
NXP Semiconductors
Self-capacitive mode
Mutual-capacitive mode
2.1. Self-capacitive mode
2.1.1. Basic measurement
The self-capacitive mode requires single pin for each touch sensor and measures the capacitance on an
electrode connected to a single TSI channel. It then converts the capacitance into a digital count by
driving average current on the electrode and measuring the charge/discharge times.
