Atmel ATSAM3U-EK データシート
Evaluation Kit Hardware
4-6
SAM3U-EK Evaluation Kit User Guide
6478E–ATARM–30-Mar-11
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.
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.
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.
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.
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.
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.
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).
more details).
VDDBU pin is powered from the 3.3V rail and a backup battery BT1 via a dual Schottky diode D6.
P W R _C N
P W R _C N
DG ND
+5V
+5V
DG ND
+3V 3
+5V
DG ND
DG ND
+3V 3
+5V
DG ND
DG ND
S HDN
D12B V R E F
ADV R E F
+3V3
+3V3
+2V5
+2V5
C 92
100nF
100nF
C 92
100nF
100nF
C 104
100nF
100nF
C 104
100nF
100nF
MN13
ZE N056V 130A24LS
ZE N056V 130A24LS
MN13
ZE N056V 130A24LS
ZE N056V 130A24LS
1
2
3
+
C 95
100uF
100uF
+
C 95
100uF
100uF
R 90
4.7K
4.7K
R 90
4.7K
4.7K
MN12
MIC 29152W U
MIC 29152W U
Micrel's 1.5A LDO, T O263-5
MN12
MIC 29152W U
MIC 29152W U
Micrel's 1.5A LDO, T O263-5
V IN
2
V OUT
4
S D
1
GN
D
1
3
ADJ
5
GN
D
2
6
C 96
100nF
100nF
C 96
100nF
100nF
T P 3
+3V 3
+3V 3
T P 3
+3V 3
+3V 3
R 80
10K
10K
R 80
10K
10K
Q2
IR LML2502
Q2
IR LML2502
1
3
2
J P 20
J UMP _3
J UMP _3
J P 20
J UMP _3
J UMP _3
1
2
3
R 77
200R 1%
200R 1%
R 77
200R 1%
200R 1%
J P 17
J P
J P
J P 17
J P
J P
C 94
15pF
15pF
C 94
15pF
15pF
T P 4
+5V
+5V
T P 4
+5V
+5V
MN14
B NX002-01
B NX002-01
MN14
B NX002-01
B NX002-01
S V
1
S G
2
C V
3
C G 1
4
C G 2
5
C G 3
6
+
C 93
22uF
22uF
+
C 93
22uF
22uF
R 79
100K
100K
R 79
100K
100K
C 103
100nF
100nF
C 103
100nF
100nF
R 78
100K
100K
R 78
100K
100K
J P 5
J UMP _3
J UMP _3
J P 5
J UMP _3
J UMP _3
1
2
3
J 11
MP 179P 2.1mm
J 11
MP 179P 2.1mm
1
2
2
3
R 76
330R 1%
330R 1%
R 76
330R 1%
330R 1%
MN15
LM4040-2.5
MN15
LM4040-2.5
Q1
IR LML6401
IR LML6401
Q1
IR LML6401
IR LML6401
1
3
2