Atmel SAM3U-EK User guide
SAM3U-EK Evaluation Kit
....................................................................................................................
User Guide
6478E–ATARM–30-Mar-11
Section 1
Introduction.................................................................................................................1-1
1.1 SAM3U Evaluation Kit........................................................................................................ 1-1
1.2 User Guide ......................................................................................................................... 1-1
1.3 References and Applicable Documents ............................................................................. 1-1
Section 2
Kit Contents ................................................................................................................2-1
2.1 Deliverables ....................................................................................................................... 2-1
2.2 Electrostatic Warning ......................................................................................................... 2-2
Section 3
Power Up....................................................................................................................3-1
3.1 Power up the Board ...........................................................................................................3-1
3.2 Battery................................................................................................................................ 3-1
3.3 DevStart ............................................................................................................................. 3-1
3.4 Recovery Procedure .......................................................................................................... 3-1
3.5 Sample Code and Technical Support ................................................................................ 3-2
Section 4
Evaluation Kit Hardware .............................................................................................4-1
4.1 Board Overview.................................................................................................................. 4-1
4.2 Features List ...................................................................................................................... 4-2
4.3 Function Blocks.................................................................................................................. 4-2
4.3.1 Processor............................................................................................................. 4-2
4.3.2 Memory................................................................................................................ 4-2
4.3.3 Clock Circuitry...................................................................................................... 4-4
4.3.4 Reset and Wake-Up Circuitry .............................................................................. 4-5
4.3.5 Power Supply and Management.......................................................................... 4-6
4.3.6 UART ................................................................................................................... 4-7
4.3.7 USART................................................................................................................. 4-7
4.3.8 LEDs .................................................................................................................... 4-8
4.3.9 LCD, Backlight Control and Touch Panel ............................................................ 4-8
4.3.10 JTAG.................................................................................................................. 4-11
4.3.11 Audio Codec ...................................................................................................... 4-11
4.3.12 USB ................................................................................................................... 4-13
4.3.13 ADC Input ........................................................................................................ 4-14
4.3.14 User Buttons ...................................................................................................... 4-14
4.3.15 G-Sensor ........................................................................................................... 4-15
4.3.16 Temperature Sensor .......................................................................................... 4-16
4.3.17 SD Card ............................................................................................................. 4-16
SAM3U-EK Evaluation Kit User Guide 1-1
6478E–ATARM–30-Mar-11
4.3.18 ZigBee ............................................................................................................... 4-17
4.3.19 PIO Expansion ................................................................................................... 4-18
4.4 Configuration.................................................................................................................... 4-19
4.4.1 PIO Usage ......................................................................................................... 4-19
4.4.2 Jumpers ............................................................................................................. 4-22
4.4.3 Test Points ......................................................................................................... 4-23
4.4.4 Solder Drops ...................................................................................................... 4-23
4.4.5 Assigned PIO Lines, Disconnection Possibility.................................................. 4-23
Section 5
Schematics .................................................................................................................5-1
5.1 Schematics......................................................................................................................... 5-1
Section 6
Troubleshooting..........................................................................................................6-1
6.1 Self-Test............................................................................................................................. 6-1
6.2 Board Recovery ................................................................................................................. 6-1
Section 7
Errata..........................................................................................................................7-1
7.1 JTAG/ICE: Missing Pull-up Resistor on TDO Pin............................................................... 7-1
Section 8
Revision History..........................................................................................................8-1
8.1 Revision History ................................................................................................................. 8-1
1-2 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
1.1 SAM3U Evaluation Kit
The SAM3U Evaluation Kit (SAM3U-EK) allows the evaluation of the SAM3U series devices. It has
enough features to demonstrate most of the product’s capabilities to the users. The SAM3U-EK also features extension connectors to allow the users to add new interfaces in case they are not on-board.
1.2 User Guide
This guide gives details on how the SAM3U-EK has been designed. It is made up of 6 sections:
Section 1 includes references, applicable documents
Section 2 describes the kit contents, its main features
Section 3 provides instructions to power up the SAM3U-EK and describes how to use it.
Section 4 describes the hardware resources, and includes default jumper and switch settings, and the
schematics.
Section 5 provides all the board schematics
Section 6 give troubleshooting recommendations
Section 1
Introduction
1.3 References and Applicable Documents
Table 1-1. References and Applicable Documents
Title Comment
SAM3U Datasheet http://www.atmel.com/dyn/products/product_card.asp?part_id=4562
SAM3U-EK Evaluation Kit User Guide 1-1
6478E–ATARM–30-Mar-11
2.1 Deliverables
The Atmel® SAM3U-EK toolkit contains the following items:
a SAM3U-EK board
power supply
universal input AC/DC power supply with US, Europe and UK plug adapters
one 3V Lithium Battery type CR1225
one USB cable
one serial RS232 cable
A Welcome Letter
Figure 2-1. Unpacked SAM3U-EK
Section 2
Kit Contents
Unpack and inspect the kit carefully. Contact your local Atmel distributor, should you have issues concerning the contents of the kit.
SAM3U-EK Evaluation Kit User Guide 2-1
6478E–ATARM–30-Mar-11
Kit Contents
2.2 Electrostatic Warning
The SAM3U-EK board is shipped in a protective anti-static package. The board must not be subjected to
high electrostatic potentials. A grounding strap or similar protective device should be worn when handling the board. Avoid touching the components or any other metallic element of the board.
2-2 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
3.1 Power up the Board
Unpack the board taking care to avoid electrostatic discharge. Unpack the power supply, select the right
power plug adapter corresponding to that of your country, and insert it in the power supply.
Connect the power supply DC connector to the board and plug the power supply to an AC power plug.
The board LCD should light up and display a welcome page. Then, click or touch icons displayed on the
screen and enjoy the demo.
3.2 Battery
The SAM3U-EK ships with a 3V coin battery.
This battery is not required for the board to start up.
The coin battery is provided for user convenience in case the user would like to exercise the date and
time backup function of the SAM3U series devices when the board is switched off.
Section 3
Power Up
3.3 DevStart
The on-board NAND Flash contains “SAM3U-EK DevStart”.
It is stored in the “SAM3U-EK DevStart” folder on the USB Flash disk available when the SAM3U-EK is
connected to a host computer and you click on the Flash Disk icon of the on-board demo.
Click the file “welcome.html” in this folder to launch SAM3U-EK DevStart.
SAM3U-EK DevStart guides you through installation processes of IAR
toolkits. Then, it gives you step-by-step instructions on how to rebuild a single example project and how
to program it into the SAM3U-EK. Optionally, if you have a SAM-ICE
how to debug the code.
We recommend that you backup the “SAM3U-EK DevStart” folder on your computer before
launching it.
3.4 Recovery Procedure
The DevStart ends by giving step-by-step instructions on how to recover the SAM3U-EK to the state as it
was when shipped by Atmel.
Follow the instructions if you deleted the contents of the embedded Flash or the NAND Flash and want
to recover from this situation.
™
EWARM, Keil MDK and GNU
™
, instructions are also given about
SAM3U-EK Evaluation Kit User Guide 3-1
6478E–ATARM–30-Mar-11
Power Up
3.5 Sample Code and Technical Support
After boot up, you can run some sample code or your own application on the development kit. You can
download sample code and get technical support from Atmel website
http://www.atmel.com/products/at91/sam3landing.asp?family_id=605
Figure 3-1. Atmel Website for SAM3U Series
3-2 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
4.1 Board Overview
PIO
SAM3U-LQFP144
SAM3U
SWJ-DPUART
System Controller
System Controller
External Memory
External Memory
EBI / 3.3v
EBI / 3.3v
PSRAM
NAND
FLASH
Multimédia Cards Interface
Multimedia Cards Interface
MCI
MCI
USART
USART
USB
USB
Device
Device
PIO
PIO
TWI
TWI
oooooooo
oooooooo
4/8 bits
interface
SD/MMC
Micro
Line In
HeadPh
oooooooo
oooooooo
LCD TFT
240 * 320
LCD TFT
240 * 320
PWM
PWM
RS232
Codec
WM8731
Led
User I/OAudioMultimedia CardTFT LCDMain Memory
Touch
Screen
Touch
Screen
BNC * 2VCC 5V JTAGRS232USB Device
High / Full
RS232ZIGBEET°
Power /
Shdn
Push Btn
ADS7843
ADS7843
HX8347
HX8347
SPI
SPI
CD
SSC
SSC
ooooo
ooooo
ZIGBEE
ZIGBEE
Analog
Analog
TWI
TWI
MCP9800
Back Light
AAT3194
RS232
This section introduces the Atmel SAM3U Evaluation Kit design. It introduces system-level concepts,
such as power distribution, memory, and interface assignments.
The SAM3U-EK board is based on the integration of an ARM
PSRAM (pseudo-static RAM), NAND Flash and a set of popular peripherals. It is designed to provide a
high performance processor evaluation solution with high flexibility for various kinds of applications.
Figure 4-1. SAM3U-EK Block Diagram
Section 4
Evaluation Kit Hardware
®
Cortex®-M3 processor with on-board fast
SAM3U-EK Evaluation Kit User Guide 4-1
6478E–ATARM–30-Mar-11
Evaluation Kit Hardware
4.2 Features List
Here is the list of the main board components and interfaces:
SAM3U4E QFP chip with optional socket footprint
12 MHz crystal
32.768 KHz crystal
Optional SMB connector, for external system clock input
PSRAM
NAND Flash
Backup Battery
2.8 inch TFT color LCD display with touch-panel and backlight
UART port with level shifter IC
USART port with level shifter IC
Audio codec with input and output jacks: stereo headphone out, stereo line in, mono microphone in
SD/MMC interface
3-D accelerometer sensor
Temperature sensor
Reset and Wake-Up buttons: NRST, NRSTB, FWUP
User buttons: Left and Right
High Speed USB device port
JTAG port
On-board power regulation with shutdown control (by the SAM3 chip)
Two user LEDs
Power LED
BNC connectors for ADC input
User potentiometer connected to the ADC input
ZigBee
3x32 bit PIO connection interfaces (PIOA, PIOB, PIOC)
®
connector
4.3 Function Blocks
4.3.1 Processor
The SAM3U-EK is equipped with a SAM3U4E in LQFP144 package.
4.3.2 Memory
The SAM3U4E chip embeds:
256 Kbytes of embedded Flash
48 Kbytes of embedded SRAM with dual bank
16 Kbytes of ROM with embedded bootloader routines (UART, USB) and IAP (In-Application
Programming functions) routines.
4-2 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
The SAM3U4E features an External Bus Interface (EBI) that permits interfacing to a broad range of
D0
D1
D2
D3
D4
D5
D
6
D7
D
8
D9
D10
D
11
D12
D13
D14
D15
A1
A
2
A
3
A4
A5
A
6
A
7
A8
A9
A10
A11
A1
2
A
13
A1
4
A15
A16
A17
A
18
A19
NBS0
NBS1
NCS0
NRD
NW
E
PB9
PB10
PB11
PB12
PB16
PB13
PB1
5
PB14
PB2
8
PB25
PB27
PB6
PB29
P
B26
PB30
P
B31
PC2
PC2
0
PC1
PC6
PC3
PC0
PC2
1
PC4
PC8
PC1
0
PC22
PC5
PC11
PC7
PC9
PC2
5
PC24
PC2
3
PB19
PB23
PC1
5
PB8
P
B7
P
B19
PB20
P
B23
PB
7
PB2
0
+3V3
+3V3
+3V3
DGND
PB[31:0]
PC[31:0
]
R
11
4
7K
R
11
4
7K
JP1
2
J
P
JP1
2
J
P
C28
100nF
C28
100nF
C29
1uF
C29
1uF
R10
47K
R10
47K
MN2
PSRAM 512K x16
MN2
PSRAM 512K x16
A0
3
A1
4
A2
5
A3
9
A4
10
A5
1
5
A
6
16
A
7
2
2
A8
4
4
A
9
45
A1
0
4
6
A11
47
A12
3
9
A13
4
0
A14
33
A1
5
3
4
A16
28
A17
2
1
A18
4
3
DQ0
12
DQ1
17
DQ2
18
DQ3
23
DQ4
29
DQ5
3
5
DQ6
36
D
Q7
42
DQ8
7
D
Q9
13
D
Q10
1
4
DQ1
1
20
D
Q12
26
DQ13
32
DQ
14
31
D
Q15
3
7
LB
#
1
UB#
8
CE#
1
1
OE
#
2
WE#
4
1
NC1
27
N
C2
38
NC3
48
VCC
24
VCCQ
25
VSS
3
0
VSSQ
19
ZZ#
6
external memories and virtually to any parallel peripheral. The SAM3U-EK board is equipped with two
kinds of memory devices connected to the SAM3U4E EBI:
One 512K x16 PSRAM device
One NAND Flash MT29F2G16ABD.
Figure 4-2. PSRAM
Evaluation Kit Hardware
(1)
Note: 1. Brand and reference may vary. Check the bill of materiel (BOM) corresponding to your
kit version to get precise information regarding that matter.
SAM3U-EK Evaluation Kit User Guide 4-3
6478E–ATARM–30-Mar-11
Evaluation Kit Hardware
PB21
PB22
PB18
PB1
7
PB24
PB6
PB31
PB30
PB16
PB15
PB14
PB13
P
B29
PB28
PB12
PB11
P
B10
PB9
PB27
PB26
PB25
PC12
+3V 3
+
3V3
+3V 3
D
GND
+3V 3
DGND
+3V 3
PB[31:0]
PC[31:0]
NANDRD
Y
N
ANDOE
NANDC
LE
NANDAL E
NANDWE
NCS
1
R18
DNP
R18
DNP
C30
100nF
C30
100nF
C33
100nF
C33
100nF
C31
100nF
C31
100nF
R
17 47K
R
17 47K
R13
4
7K
R13
4
7K
R12
47K
R12
47K
C32
1
00nF
C32
1
00nF
R
14 0R
R
14 0R
JP13JPJP13
JP
MN3
MT29F 2G16AADW P
MN3
MT29F 2G16AADW P
NC1
1
NC2
2
NC3
3
NC4
4
NC5
5
NC6
6
R/B#
7
RE#
8
CE#
9
NC
7
10
NC8
11
VCC1
12
VSS 1
13
NC9
14
NC10
15
CLE
16
ALE
17
WE#
18
WP#
19
NC11
20
NC12
21
NC13
22
NC14
23
NC15
24
VSS 2
25
IO8
26
IO9
27
IO10
28
IO0
29
IO1
30
IO2
31
IO3
32
IO11
33
VCC2
34
NC16
35
VSS 3
36
VCC3
37
NC17
38
VCC4
39
IO12
40
IO4
41
IO5
42
IO6
43
IO7
44
IO13
45
IO14
46
IO15
47
VSS 4
48
Figure 4-3. NAND Flash
The chip select signals NCS0 and NCS1 are used for PSRAM and NAND Flash chips selection, respectively. Furthermore, a dedicated jumper can disconnect these from the memories, to let NCS0 and NCS1
be used for other custom purpose.
4.3.3 Clock Circuitry
The clock generator of a SAM3U4E microcontroller is made up of:
A Low Power 32,768 Hz Slow Clock Oscillator with bypass mode
A 3 to 20 MHz Crystal Oscillator, which can be bypassed (12 MHz needed in case of USB)
A factory programmed fast internal RC Oscillator. 3 output frequencies can be selected: 4, 8 or
12 MHz (default value is 4 MHz).
A 480 MHz UTMI PLL providing a clock for the USB High Speed Device Controller
A 96 to 192 MHz programmable PLL (input from 8 to 16 MHz), capable of providing the clock MCK to
the processor and to the peripherals.
The SAM3U-EK board is equipped with one 12 MHz crystal, one 32,768 Hz crystal and an external clock
input connector (optional, not populated by default).
4-4 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
Figure 4-4. External Clock Source
XIN32
X
IN1
XOUT32
XOUT1
X
OUT1
XIN
1
XOUT32
XIN32
DGN
D
DGND
DGND
D
GND
XIN
XOUT
XIN3
2
X
OUT32
C2
6
20pF
C2
6
20pF
R7
0
RR7
0
R
Y1
12.000MHz
Y1
12.000MHz
C25
20pF
C25
20pF
MN1B
SAM3U
MN1B
SAM3U
XIN32
144
XOUT32
143
XIN
36
XOUT
35
GND1
18
GNDPL
L
33
GNDUTMI
43
GND2
52
GND
3
6
0
GNDAN
A
75
GND4
9
0
GND
5
1
26
GNDBU
140
C27
20pF
C27
20pF
R
60
RR
60
R
Y2
32.768KHz
Y2
32.768KHz
1 2
3
C24
20pF
C24
20pF
J1J
1
1
2 3
5
4
R8
DN
PR8
DN
P
D
GND
VBU
NRST
NRSTB
FWUP
WAKE_UP#
BP2BP2
1
42
3
BP1BP1
1
42
3
BP3BP3
1
42
3
R
65
100K
R
65
100K
4.3.4 Reset and Wake-Up Circuitry
The on-board NRST button BP1 and NRSTB button BP2 provide the SAM3U4E with external reset control. The on-board WAKE-UP button BP3 can be used to wake up the chip from low power modes.
Evaluation Kit Hardware
Figure 4-5. System Buttons
The NRST pin is bidirectional. It is handled by the on-chip reset controller. It can be driven low to provide
a reset signal out to the external components. Conversely, it can be asserted low from the outside to
reset the microcontroller, its core and peripherals, Backup region (RTC, RTT and Supply Controller)
6478E–ATARM–30-Mar-11
excepted. The NRST pin integrates a permanent pull-up resistor of about 100 kOhm to VDDIO.
On the SAM3U-EK board, the NRST signal is connected to the LCD module and JTAG port.
The NRSTB pin is an input-only signal that enables the asynchronous reset of the SAM3U4E series
when asserted low. The NRSTB pin integrates a permanent pull-up resistor of about 15 kOhm. This
allows the connection of a simple push button for implementing a system-user reset. Whatever the
mode, this pin will reset the chip including the Backup region (RTC, RTT and Supply Controller). It
makes the chip behave as for a Power-on reset. An external capacitor (10 nF) is connected between
NRSTB and VDDIO to enforce the signal stability on this pin.
SAM3U-EK Evaluation Kit User Guide 4-5
Evaluation Kit Hardware
PWR_CN
PWR_CN
DGND
+5V +5V
DGND
+3V 3
+5V
DGND
DGN
D
+3V3 +5V
DGN
D
DGND
SHD
N
D12B
VRE F
ADVRE
F
+3
V3
+3V 3
+2V5
+
2V5
C92
100nF
C92
100nF
C104
100nF
C104
100nF
MN13
ZEN056V130A24LS
MN13
ZEN056V130A24LS
1
2
3
+
C95
100uF
+
C95
100uF
R90
4.7K
R90
4.7K
MN12
MIC29152W U
Micrel's 1.5A L DO, TO263-5
MN12
MIC29152W U
Micrel's 1.5A L DO, TO263-5
VIN
2
VOUT
4
SD
1
GND1
3
ADJ
5
GND2
6
C96
100nF
C96
100nF
TP3
+3V 3
TP3
+3V 3
R
80
10
K
R
80
10
K
Q2
I
RLML2502
Q2
I
RLML2502
1
3
2
J
P20
JUMP_3
J
P20
JUMP_3
1
2
3
R7
7
200R 1%
R7
7
200R 1%
JP1
7
J
P
JP1
7
J
P
C9
4
15p
F
C9
4
15p
F
TP4
+5V
TP4
+5V
MN14
BNX002-01
MN14
BNX002-01
SV
1
SG
2
C
V
3
CG1
4
C
G2
5
CG3
6
+
C93
22uF
+
C93
22uF
R79
100K
R79
100K
C103
100
nF
C103
100
nF
R78
100K
R78
100K
JP
5
JUMP_
3
JP
5
JUMP_
3
1
2
3
J11
MP179P 2.1m
m
J11
MP179P 2.1m
m
1
2
3
R76
330R 1%
R76
330R 1%
MN15
LM4040-2.5
MN15
LM4040-2.5
Q1
IRLML6401
Q1
IRLML6401
1
3
2
The FWUP pin is Force Wake-Up active low input. It is enabled as a wake-up source with external pullup. If the FWUP pin is asserted for a time longer than the debouncing period (configurable for 100 µs,
1 ms, 16 ms, 128 ms or 1 second), a core power supply wake-up is initiated.
4.3.5 Power Supply and Management
The SAM3U-EK board is supplied with an external 5V DC block through input J11. Protection circuitry is
obtained by a PolyZen diode MN13 and an LC combinatory filter MN14.
The adjustable LDO regulator MN12 is employed for the main supply of the 3.3V rail. It powers all the
3.3V board components. The shut down control of this LDO is made by MOSFETs Q1, Q2 piloted by the
SAM3U4E SHDN pin. When SAM3U4E is in backup mode, SHDN pin outputs a low level signal, which
shuts down the LDO. When the device is running (not in backup mode), SHDN pin output a high level
signal, which enables the LDO.
By closing the “FORCE POWER ON” jumper JP17, the P-channel MOSFET Q1 will be forced on, no
matter the level present on the SHDN pin, and the LDO 3.3V output will thereby be forced active.
Figure 4-6. Power Block
The SAM3U-EK board uses the 3.3V LDO output as its main supply source. VDDUTMI, VDDANA,
VDDIO, VDDIN are powered directly from that source.
The internal 1.8V regulator output feeds VDDCORE and VDDPLL.
VDDCORE and VDDPLL can also be powered by an external supply. (Refer to the SAM3U datasheet for
more details).
4-6 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
VDDBU pin is powered from the 3.3V rail and a backup battery BT1 via a dual Schottky diode D6.
Figure 4-7. Backup Battery
+3V 3
D
GND
VBU
DGND
D6
BAT54C
D6
BAT54C
3
2
1
MN1B
SAM3U
MN1B
SAM3U
VDDBU
139
CR1225
3V
BT1
KY001
CR1225
3V
BT1
KY001
+
1
-
2
3
3
4
4
C21
1uF
C21
1uF
JP4JPJP4
JP
P
A12
PA1
1
DGND
+3V
3
DGND
+3V3+3V3
PA[31:0]
UTXD
URX D
C45
100nF
C45
100nF
C
44
100nF
C
44
100nF
C46
100nF
C46
100nF
R330RR330R
MN6
MAX3 232CS E
MN6
MAX3 232CS E
T1IN
11
T
2IN
10
R1OUT
1
2
R2OUT
9
T1OUT
14
T2OUT
7
R1IN
13
R2IN
8
V+
2
C1+
1
C1-
3
C2+
4
C2-
5
V-
6
VCC
16
GND
15
C48
100nF
C48
100nF
R3
1
100K
R3
1
100K
J3
MALE R IG HT ANGL ED
J3
MALE R IG HT ANGL ED
5
4
3
2
1
9
8
7
6
10
11
C47
100nF
C47
100nF
R1030RR1030R
TP1
7
SM
D
TP1
7
SM
D
TP1
8
SMD
TP1
8
SMD
R32
100K
R32
100K
4.3.6 UART
The Universal Asynchronous Receiver Transmitter features a two-pin UART that can be used for communication and trace purposes. It offers an ideal channel for in-situ programming solutions. This UART
is associated with two PDC channels to reduce the processor time on packet handling.
This two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN6 and brought to
the DB9 male connector J3.
Figure 4-8. UART
Evaluation Kit Hardware
4.3.7 USART
The Universal Synchronous/Asynchronous Receiver Transmitter (USART) provides one full duplex universal synchronous/asynchronous serial link. The data frame format is extensively configurable (data
length, parity, number of stop bits) to support a broad range of serial communication standards. The
USART is also associated with PDC channels for TX/RX data access.
There are 3 USARTs on the SAM3U4E device, SAM3U-EK connects the USART1 bus (including TXD,
RXD, RTS, CTS handshake signals control) to the DB9 male connector J4 through the RS232 Transceiver MN7.
6478E–ATARM–30-Mar-11
SAM3U-EK Evaluation Kit User Guide 4-7
Evaluation Kit Hardware
Figure 4-9. USART
PA[31:0]
TXD1
RXD1
R
TS1
CTS1
P
A20
PA2
PA2
PA23
4.3.8 LEDs
There are three LEDs on the SAM3U-EK board:
D2 and D3 green LEDs are user defined and controlled by the GPIO.
D4 red LED is a power LED indicating that the 3.3V rail is enabled. It can also be controlled by the
GPIO (by default, the GPIO is disabled and an on-board pull-up to 3.3V lights the LED).
+3V3+3V3
R3
R3
1
1
00K
00K
1
2
T
T
P19
P19
SMD
SMD
4
4
3
+3V
R3
R3
5
5
100K
100K
R104 0RR104 0R
R1050RR105
C5
C5
1
1
100nF
100nF
0R
TP2
TP2
SM
SM
MN7
MN7
MAX3232C SE
MAX3232C SE
16
VCC
C49
C49
F
F
100n
100n
C
C
100nF
100nF
GND
D
0
0
D
D
2
V
+
6
V
52
52
-
15
GND
1
1
T1IN
2
1
R1OUT
0
1
T2IN
9
R2OUT
C1+
C1-
C2+
C
T1OUT
R1IN
2OUT
T
R2IN
1
C50
C50
100nF
3
4
5
2-
14
13
7
8
100nF
C53
C53
100nF
100nF
DGND
J4
J4
MALE R IG HT ANGL ED
MALE R IG HT ANGL ED
1
6
2
7
3
8
4
9
5
10
11
Figure 4-10. LEDs
PB[31:0]
USR_LED1#
USR_LED2#
POWER_LE D#
4.3.9 LCD, Backlight Control and Touch Panel
SAM3U-EK carries one TFT/Transmissive LCD module with touch screen, FTM280C12D, with integrated driver IC HX8347. The LCD display size is 2.8 inches, with a native resolution of 240 x 320 pixels.
IRLML
IRLML
DGN
D
Q3
Q3
2502
2502
B4
P
B5
P
PB0
PB1
PB2
R8
R8
220R
220R
R8
R8
220R
220R
5
5
7
7
D2 green-led
D2 green-led
0603
0603
D3 green-led
D3 green-led
0603
0603
89 100K
89 100K
R
R
+3V 3
1
R92
R92
2
2
20R
20R
32
D4 red-led
D4 red-led
0603
0603
4-8 SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
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