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Evaluation Kit Hardware
4.3.12.2 Analog Input
The BNC connector CN1 is connected to the ADC port PB1 as an external analog input. An on-board 50-
Ohm resistor termination can be applied by closing jumper JP16. A low pass filter can be implemented
for the BNC connector CN1 by replacing R94 and C78 with custom resistor and capacitor values,
depending on your application requirements.
A 10-KOhm potentiometer (VR1) is also connected to this channel to implement an easy access to ADC
programming and debugging (or implement an analog user control like display brightness, volume, etc.).
Either of these two functions can be selected by jumper JP18.
Figure 4-16. ADC Input
CN1
BNC
5
1
2
3
JP16
R94
0R
C7 8
4
R96
10nF
49.9R 1%
AD12B5
DGND
VCC 33
VR1
10K
2
JP1 8
2
PB1
Potentiometer
C 8 9
10nF
ADC
DGND
4.3.12.3 Analog Output
The BNC connector CN2 is connected to the DAC port PB13 and provides an external analog output. An
on-board 50-Ohm resistor termination can be enabled by closing jumper JP21. A filter can be imple-
mented on this output channel by replacing R106 and C90 with appropriate resistor and capacitor
values, depending on the application requirements.
Figure 4-17. DAC Output
2
1
CN2
BNC
5
R106 SOLDER DROP 2 pins open.Normal
0R
PB14
1
JP21
C90
2.2 u F
S D1
2
3
4
R109
1
S D2
2
49.9R 1%
AUDIO_OUTL
DAC01
DGND
DAC
4.3.13
QTouch Elements
QTouch keys consist in a series of sensors formed by the association of a copper area and the capaci-
tive effect of human fingers approaching it.
4.3.13.1 Keys
The SAM3S-EK implements five individual capacitive touch keys (UP, DOWN, RIGHT, LEFT and
VALID) using five pairs of PIO.
4-12
11031C–ATARM–30-Mar-11
SAM3S-EK Development Board User Guide
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