Touch Elements - Atmel SAM3N-EK User Manual

Figure 4-10. SD Card
4.3.12

Touch Elements

QTouch keys consist of a series of sensors formed by the association of a copper area and the capaci-
tive effect of human fingers approaching it.
Figure 4-11.
Keys
The SAM3N-EK implements two individual capacitive touch keys (RIGHT, LEFT) using two pairs of
PIOs.
Slider
A group of channels forms a Slider. A Slider is composed of three channels for a QTouch acquisition
method using three pairs of PIOs. Such a sensor is used to detect a linear finger displacement on a sen-
sitive area. A typical slider implementation is volume control.
4.3.13 User Buttons
There are two mechanical user buttons on the SAM3N-EK, which are connected to PIO lines and
defined to be "left" and "right" buttons by default.
In addition, a mechanical button controls the system reset, signal NRST.
SAM3N-EK Development Board User Guide
NPCS_MicroSD
PA11
SPI MOSI
PA13
SPI CLK
PA14 R37 R37
SPI MISO
R38 R38
PA12
PA19
Micro SD CARD in SPI Mode
QTouch Elements
PC1 R53 R53 1K 1K
C46 C46
22nF 22nF
PC0
PC3 R55 R55 1K 1K
C48 C48
22nF 22nF
PC2
PC5 R57 R57 1K 1K
C50 C50
22nF 22nF
PC4
+3V3
+ +
C36 C36
10uF 10uF
RA1 RA1
R33 R33 R34 R34
47KX4 47KX4
10K 10K 10K 10K
DGND
0R 0R
10R 10R
DGND
S1 S1
DNP DNP
SR
PC9
C47 C47
SL
22nF 22nF
PC8
SM
PC11
C49 C49
SR
22nF 22nF
PC10
QTOUCH
Evaluation Kit Hardware
C37 C37
100nF 100nF
J3 J3
TF01A TF01A
1
RSV(DAT2)
2
CS(DAT3)
3
DI(CMD)
4 11
VCC Sh1
5 12
CLK Sh2
6 13
VSS Sh3
7
DO(DAT0)
8
RSV(DAT1)
10
DGND
GND
9
CD
K1 K1
DNP DNP
R54 R54 1K 1K
K2 K2
DNP DNP
R56 R56 1K 1K
11080C–ATARM–30-Mar-11
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