Evaluation Kit Hardware
4-10
SAM3S-EK Development Board User Guide
11031A–ATARM–14-Dec-09
Figure 4-13.
Headphone Output
Using a readily available 1/8-in. (3,5 mm) stereo headphone jack, the control switch is closed when no
plug is inserted. When closed, a 100-kOhm/1-kOhm divider pulls the ST/MN input low. When a jack plug
is inserted, the 1-kOhm resistor is disconnected and the ST/MN input is pulled high. The mono speaker
(J10 connector) is also physically disconnected from the RO/MO+ output so that no sound is heard from
the speaker while the headphones are inserted.
4.3.11
USB Device
The SAM3S UDP port is compliant with the Universal Serial Bus (USB) rev 2.0 Full Speed device speci-
fication. J15 is a micro B-type receptacle for USB device.
Both 27-Ohm resistors R114 and R116 build up a 90-Ohm differential impedance together with the
(embedded) 6-Ohm output impedance of the SAM3S full speed channel drivers.
R110 and R112 build up a divider bridge from VBUS +5V to implement plug-in detection (5V level gets
lowered to a PIO compatible 3.3V level) through PC21.
Figure 4-14.
USB
AUDIO_OUTL
AUDIO_OUTL
AGND
VDD_AMP
AGND
AGND
AGND
AGND
+5V
AGND
DGND
VDD_AMP
AGND
PB14
{
3
,7}
PB1
3
JP19
JP19
C
8
2
100nF
C
8
2
100nF
C
88
0.47
u
F
C
88
0.47
u
F
+
C
8
1
220
u
F
+
C
8
1
220
u
F
R10
3
100K
R10
3
100K
R95
1K
R95
1K
C
8
7
1
u
F
C
8
7
1
u
F
R99
47K
R99
47K
JP20
JP20
R9
8
33
K
R9
8
33
K
C
8
6
0.47
u
F
C
8
6
0.47
u
F
MN1
3
TPA022
3
DGQ
MN1
3
TPA022
3
DGQ
VDD
3
RIN
5
MONO-IN
1
LIN
9
LO/MO-
10
RO/MO+
6
S
T/MN
7
S
HUTD0WN
2
BYPA
SS
4
GND
8
PAD
11
+
C
8
0
10
u
F
+
C
8
0
10
u
F
C
8
5
0.47
u
F
C
8
5
0.47
u
F R100
33
K
R100
33
K
R105
33
K
R105
33
K
S
D1
S
D1
1
2
+
C
83
220
u
F
+
C
83
220
u
F
J11
EARJACK
J11
EARJACK
5
4
3
2
1
R97
1K
R97
1K
R102
100K
R102
100K
TP12
S
MD
TP12
S
MD
C
8
4
0.47
u
F
C
8
4
0.47
u
F
S
D2
S
D2
1
2
B
3
BN0
3
K
3
14
S3
00R
B
3
BN0
3
K
3
14
S3
00R
JP17
JP17
J10
J10
1
2
R104
47K
R104
47K
R101
100K
R101
100K
C79
1
u
F
C79
1
u
F
( to DAC o
u
tp
u
t
connector )
PC21
PB10
PB11
DGND
DGND
FGND
FGND
C94
10pF
C94
10pF
R110
47K
R110
47K
R116
27R
R116
27R
5V
D-
D+
ID
G
J15
U
S
B Micro B
5V
D-
D+
ID
G
J15
U
S
B Micro B
1
2
3
4
7
5
6
8
9
RV1
V5.5MLA060
3
RV1
V5.5MLA060
3
RV2
V5.5MLA060
3
RV2
V5.5MLA060
3
R112
6
8
K
R112
6
8
K
R114
27R
R114
27R
