ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 14

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6478E–ATARM–30-Mar-11
Evaluation Kit Hardware
4.3.5
Figure 4-6.
4-6
S HDN
J 11
J 11
MP 179P 2.1mm
MP 179P 2.1mm
1
2
Power Supply and Management
1
MN13
MN13
ZE N056V 130A24LS
ZE N056V 130A24LS
R 80
R 80
10K
10K
Power Block
The FWUP pin is Force Wake-Up active low input. It is enabled as a wake-up source with external pull-
up. 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.
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.
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).
VDDBU pin is powered from the 3.3V rail and a backup battery BT1 via a dual Schottky diode D6.
3
IR LML2502
IR LML2502
+5V
Q2
Q2
R 78
R 78
100K
100K
1
C 92
C 92
100nF
100nF
C 94
C 94
15pF
15pF
2
3
2
Q1
Q1
IR LML6401
IR LML6401
1
2
3
MN14
MN14
B NX002-01
B NX002-01
S V
S G
J P 17
J P 17
J P
J P
C G 1
C G 2
C G 3
C V
DG ND
3
4
5
6
R 79
R 79
100K
100K
P W R _C N
+5V
DG ND
C 93
C 93
22uF
22uF
T P 4
T P 4
+5V
+5V
D12B V R E F
ADV R E F
+5V
P W R _C N
2
1
MN12
MN12
MIC 29152W U
MIC 29152W U
Micrel's 1.5A LDO, T O263-5
Micrel's 1.5A LDO, T O263-5
V IN
S D
DG ND
DG ND
DG ND
C 104
C 104
100nF
100nF
C 103
C 103
100nF
100nF
V OUT
SAM3U-EK Evaluation Kit User Guide
ADJ
4
5
+2V5
+3V3
+2V5
+3V3
2
2
J P 20
J P 20
J UMP _3
J UMP _3
J P 5
J P 5
J UMP _3
J UMP _3
1
3
1
3
R 76
R 76
330R 1%
330R 1%
R 77
R 77
200R 1%
200R 1%
+3V 3
+3V 3
LM4040-2.5
LM4040-2.5
C 95
C 95
100uF
100uF
MN15
MN15
DG ND
+5V
T P 3
T P 3
+3V 3
+3V 3
R 90
R 90
4.7K
4.7K
C 96
C 96
100nF
100nF