Datasheet

Figure 36-3. 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
36.5.1.2 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.
Figure 36-4. Self-Capacitance Sensor Arrangement
MCU
PTC
Module
Y
0
Y
1
Y
m
C
y0
C
y1
C
ym
Sensor Capacitance C
y
For more information about designing the touch sensor, refer to Buttons, Sliders and Wheels Touch
Sensor Design Guide.
36.5.2 Clocks
The PTC is clocked by the GCLK_PTC clock. The PTC operates from an asynchronous clock source and
the operation is independent of the main system clock and its derivative clocks, such as the peripheral
SAM D21 Family
Peripheral Touch Controller (PTC)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 980