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SAMA5D3 Xplained [USER GUIDE]
Atmel-11269D-ATARM-SAMA5D3-Xplained-XPLD-User Guide_07-Sep-15
4.2.3.1 Power Options
Several power options are available to configure the SAMA5D3 Xplained board powering scheme.
The power sources are selected by a set of 0R resistors.
The USB-powered operation is the default configuration. The power source is the USB device port (J6) connected
to a PC or a mini-AB 5V DC supply. The USB supply is sufficient to power the board in most applications if USB
host ports are not used. If USB host ports are used, it is recommended to use a DC supply source.
Schematic diagrams of various power options are illustrated in
Figure 4-4
.
Figure 4-4.
Input Powering Scheme Option Schematic
Note:
USB-powered operation is a good “single cable” solution because it combines powering and board control through a
unique cable. Consequently, it eliminates the need for other wires and batteries. This power option is suitable for most
projects that only require 5 volts at up to 500 mA.
4.2.3.2 Mains Power Adapter
A mains power supply adapter can be used to provide power to the board. A regulated 5V DC supply of typically
2A is required but a current range of 3A is recommended if the USB ports and expansion headers are likely to be
used. It needs a 2.1 mm plug with a center-hot configuration.
If you are using the USB host ports or expansion board Arduino shields, a higher current is required. To supply the
full 500 mA per port, a mains power adapter must be used.
4.2.3.3 VBAT
By default, VDDBU is delivered through the 3.3V node. An optional SuperCap (C41), used for real-time clock
backup, is provided. The board does not come equipped with the SuperCap. When the SuperCap is not installed,
an R185 must be installed. You must make sure that the R185 is removed prior to installing the SuperCap.
Figure 4-5.
VBAT Powering Scheme Option Schematic
5V_MAIN
Vbus
[5]
5V_Ext
[11]
R175
0R
R175
0R
J2
DNP(DC JACK)
J2
DNP(DC JACK)
3
1
2
R176
DNP(0R)
R176
DNP(0R)
D4
P4SMAJ5.0A
D4
P4SMAJ5.0A
1
2
R3
DNP(0R)
R3
DNP(0R)
R1
0R
R1
0R
R2
DNP(0R)
R2
DNP(0R)
R177
DNP(0R)
R177
DNP(0R)
TDI
TMS
TCK
TDO
NTRST
NRST
VDDBU
3V3
3V3
TMS
[11]
TCK
[11]
TDO
[11]
TDI
[11]
NRST
[4,9,10,11]
NTRST
[11]
VBat
[11]
(Super)-Capacitor
energy storage
Place TP4 to Bottom
Populate R185 if
no Super Cap (C41)
R25
10K
R25
10K
R185
1.5K 1%
R185
1.5K 1%
D1
BAT54CLT1
D1
1
2
3
TP4
SMD
TP4
SMD
C27
10nF
C27
10nF
C28
100nF
C28
100nF
C41
DNP(0.2F/3V3)
C41
DNP(0.2F/3V3)
TDO
M11
TMS
N10
TCK
P9
NTRST
P11
TDI
R8
JTAGSEL
T9
BMS
U9
TST
U15
NRST
V9
V
DDB
U
V1
5
R23
1.5K 1%
R23
1.5K 1%
R21
100K 1%
R21
100K 1%
R22
DNP(100K)
R22
DNP(100K)
R20
100R
R20
100R
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