4.1 BUTTONx (Touch Electrodes)

BUTTONx are the touch sensor input pins that are connected to the sensor electrodes via a series resistor to reduce the EMI and EMC. The series resistor can be from 1 kΩ to 100 kΩ, depending on the sensor capacitance and desired level of EMC performance. Refer to Microchip Application Note (AN2934) - Capacitive Touch Sensor Design for further details.

With the exception of BUTTON0, all other buttons can be disabled by connecting the corresponding BUTTONx pin to V_DD. The MTCH1030 touch controller can be configured to perform touch measurements for fewer buttons using this option, thus improving the response time and power consumption for the designs that require only a subset number of sensors.