Evaluation Kit Hardware
SAM3S-EK Development Board User Guide
4-13
11031A–ATARM–14-Dec-09
Figure 4-19.
QT_Slider
4.3.14
User Buttons
There are two mechanical user buttons on the SAM3S-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.
Figure 4-20.
System Buttons
4.3.15
LEDs
There are three LEDs on the SAM3S-EK board:
A blue LED (D2) and a green LED (D3), which are user defined and controlled by the GPIO.
A red LED (D4), which is 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 4-21.
LEDs
PA1
PA0
PA
3
PA2
PA5
PA4
R54
1K
R54
1K
R50
1K
R50
1K
C50
22nF
C50
22nF
C46
22nF
C46
22nF
S
1
DNP
S
1
DNP
S
L
S
M
S
R
S
R
R52
1K
R52
1K
C4
8
22nF
C4
8
22nF
PB
3
PC12
DGND
NR
S
T
JP26
JP26
BP1
BP1
1
4
2
3
BP
3
BP
3
1
4
2
3
JP25
JP25
BP2
BP2
1
4
2
3
PA19
PA20
PC20
+
3
V
3
DGND
D4
Red-led
D4
Red-led
R11
3
220R
R11
3
220R
Q1
IRLML2502
Q1
IRLML2502
1
3
2
R115
100K
R115
100K
D
3
Green-led
D
3
Green-led
R117
220R
R117
220R
R111
220R
R111
220R
D2
Bl
u
e-led
D2
Bl
u
e-led
