Datasheet

Refer to I/O Multiplexing and Considerations for details on the pin mapping for this peripheral. One signal
can be mapped on several pins.
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6. I/O Multiplexing and Considerations
50.5 System Dependencies
In order to use this peripheral, configure the other components of the system as described in the following
sections.
50.5.1 I/O Lines
The I/O lines used for analog X- and Y-lines must be connected to external capacitive touch sensor
electrodes. External components are not required for normal operation. However, to improve the EMC
performance, a series resistor of 1 kΩ or more can be used on X- and Y-lines.
50.5.1.1 Mutual Capacitance Sensor Arrangement
A mutual capacitance sensor is formed between two I/O lines - an X electrode for transmitting and Y
electrode for sensing. The mutual capacitance between the X and Y electrode is measured by the
peripheral touch controller.
Figure 50-3. Mutual Capacitance Sensor Arrangement
PTC
Module
MCU
X
0
X
n
Y
0
Y
m
X
1
Y
1
Sensor Capacitance C
x,y
C
x0,y0
C
x0,y1
C
x0,ym
C
x1,y0
C
x1,y1
C
x1,ym
C
xn,y0
C
xn,y1
C
xn,ym
PTC
Module
50.5.1.2 Self Capacitance Sensor Arrangement
A self capacitance sensor is connected to a single pin on the peripheral touch controller through the Y
electrode for sensing the signal. The sense electrode capacitance is measured by the peripheral touch
controller.
SAM D5x/E5x Family Data Sheet
PTC - Peripheral Touch Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1886