Datasheet

50. PTC - Peripheral Touch Controller
50.1 Overview
The Peripheral Touch Controller (PTC) acquires signals in order to detect a touch on the capacitive
sensors. The external capacitive touch sensor is typically formed on a PCB, and the sensor electrodes
are connected to the analog front end of the PTC through the I/O pins in the device. The PTC supports
both self and mutual capacitance sensors.
In the Mutual Capacitance mode, sensing is done using capacitive touch matrices in various X-Y
configurations, including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one
pin per Y-line.
In the Self Capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor.
The number of available pins and the assignment of X- and Y-lines is depending on both package type
and device configuration. Refer to the Configuration Summary and I/O Multiplexing table for details.
Related Links
6. I/O Multiplexing and Considerations
50.2 Features
• Low-Power, High-Sensitivity, Environmentally Robust Capacitive Touch Buttons, Sliders, and Wheels
• Supports Wake-up on Touch from sleep mode Sleep mode
• Supports Mutual Capacitance and Self Capacitance Sensing
– Mix-and-Match Mutual and Self Capacitance Sensors
• One Pin per Electrode – No External Components
• Load Compensating Charge Sensing
– Parasitic capacitance compensation and adjustable gain for superior sensitivity
• Zero Drift Over the Temperature and V
DD
Range
– Auto calibration and recalibration of sensors
• Single-shot and free-running Charge Measurement
• Hardware Noise Filtering and Noise Signal Desynchronization for High Conducted Immunity
• Selectable channel change delay allows choosing the settling time on a new channel, as required
• Acquisition-start triggered by command or through auto-triggering feature
• Low CPU utilization through interrupt on acquisition-complete
• Using ADC peripheral for signal conversion and acquisition
Related Links
6. I/O Multiplexing and Considerations
SAM D5x/E5x Family Data Sheet
PTC - Peripheral Touch Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1884