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Evaluation Kit Hardware
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
J15
U S B Micro B
8
5V
D-
D+
ID
G
7
9
6
FGND
RV2
V5.5MLA060 3
RV1
V5.5MLA060 3
PC21
R110
47K
C94
R112
6 8 K
10pF
DGND
DGND
FGND
4.3.12
Analog Interface
PB10
PB11
R114
R116
27R
27R
4.3.12.1 Analog Reference
The 2V5 voltage reference is based on an LM4040 (Precision Micropower Shunt Voltage Reference).
This ADVREF level can be set as 2.5V or 3.3V via the jumper JP2.
Figure 4-15. Analog Vref
VCC 33
AT91 S AM 3S
+5V
ADVREF
1
ADVREF
2
JP2
R1 3
2.2K
C5
100nF
MN2
LM4040-2.5
DGND
DGND
SAM3S-EK Development Board User Guide
4-11
11031C–ATARM–30-Mar-11
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