SAM4E-EK User Guide
42067A
−
SAM4E
−
01/2013
20
4.3.17 QTouch elements
QTouch keys consist in a series of sensors formed by the association of a copper area and the capacitive effect of
human fingers approaching it.
Keys
The Atmel SAM4E-EK implements two individual capacitive touch keys (RIGHT, LEFT).
Slider
A group of channels forms a Slider. A Slider is composed of eight channels for a QTouch acquisition method. Such a
sensor is used to detect a linear finger displacement on a sensitive area. A typical implementation is volume control.
Figure 4-19. QT_Slider.
R122
2.2K
R123
2.2K
Qtouch
R114
1K
C89
100nF
C91
4.7nF
R115
1K
R116
1K
PE4
QKEY
K2
1
2
R118
1K
R119
1K
R120
1K
R121
1K
PA4
MN17
AT42QT2160
VDD
3
VDD
16
VDD
17
RST
25
SDA
23
SCL
24
CHANGE
7
I2C_A0
21
I2C_A1
22
VREF
8
VSS
4
VSS
18
X0
10
X1
11
X2
12
X3
13
X4
14
X5
15
X6
5
X7
6
GPIO2
1
GPIO3
2
GPIO1
28
Y1A
27
Y1B
20
Y0A
26
Y0B
19
SMP
9
PAD
29
QKEY
K1
1
2
+3V3
R128
1K
R127
1K
FB3
BN03K314S300R
R124
10K
Sl
ide
r
S1
X6
X5
X4
X3
X2
X1
X0
Y0
+3V3
C88
1uF
C87
100nF
C90
4.7nF
R129
1M
R117
10K
R130
1M
PA3
4.3.18 LEDs
There are three LEDs on the SAM4E-EK board:
•
A blue LED (D2), amber LED (D3) and a green LED (D4), which are user defined and controlled by the GPIO
•
A red LED (D5), which is a power LED indicating that the 3.3V power rail is active. It is also controlled by the
GPIO and can be treated as a user LED as well. The only difference with the two others is that it is controlled
through a MOS transistor. By default, the PIO line is disabled; a pull-up resistor controls the MOS to light the
LED when the power is ON
Figure 4-20. LEDs.
PWM
PD20
+3V3
PD21
D4
LED Green
D5
LED Red
R157
470R
R158
470R
R160
470R
R159
100K
D3
LED Amber
Q1
IRLML2502
1
3
2
LEDS
PD22
PWM
POWER
PA0
R154
470R
D2
LED Blue
TIMER
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