35.5.1.3.1 Self-Capacitance Sensor Arrangement

A self-capacitance sensor is connected to a single pin on the PTC through the Y-electrode. The PTC measures the capacitance of the sense electrode.

For a capacitive matrix array where only a single touch point is needed, self-capacitance sensing on both vertical and horizontal lines can effectively identify the touch point by locating the intersection of the touched lines.

For more information about designing the touch sensor, refer to the AN2934—Capacitive Touch Sensor Design Guide (DS00002934).