Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
4-8
SAM9N12/CN11-EK User Guide
11186A–ATARM–29-Nov-12
The 1.8V DC core supply is based on an LDO LP38692MP IC. It is powered by the 5V DC supply. Its
output is used for VDDIOM and VDDNF. Test point TP6 is used to perform testing.
output is used for VDDIOM and VDDNF. Test point TP6 is used to perform testing.
Figure 4-7.
1.8V Supply
The 1.0V DC core supply is based on an LDO ADP1715AR. It is powered by the output of the 3.3V CC
supply. Its output is used for VDDCORE and VDDPLL. Test point TP10 is used to perform testing.
supply. Its output is used for VDDCORE and VDDPLL. Test point TP10 is used to perform testing.
Figure 4-8.
1V Supply
4.3.6
Battery Backup
VDDBU pin is powered from the 3.3V rail and a backup battery BT1 via a dual Schottky diode D1. Test
point TP13 and jumper JP2 are used to perform testing.
point TP13 and jumper JP2 are used to perform testing.
Figure 4-9.
Backup Battery
Note:
Test points (TPn) are provided for easy access to each of the regulated power lines.
PWR_EN
TP7
VDDNF
L5
220ohm at 100MHz
1
2
C9
10uF
10uF
C8
4. 7uF
4. 7uF
+5V
+1V8
MN2
LP38692MP-1.8
LP38692MP-1.8
VIN
4
VOUT
3
VEN
1
NC
2
GN
D
5
VDDIOM
TP6
L4
220ohm at 100MHz
1
2
TP8
TP10
+1V
C 144
100nF
100nF
C 11
10uF
10uF
AD P1715
MN 3
AD P1715AR MZ
GN
D
6
GN
D
5
OU T
3
EN
1
AD J
4
GN
D
7
IN
2
GN
D
8
R 10
12K 1%
12K 1%
C 10
10uF
10uF
C 143
10nf
10nf
C 147
22pF
22pF
R 13
47K 1%
+3V3
J P2
+3V3
BT1
D 1
BAT54C
BAT54C
3
2
1
TP13
C 18
2.2uF
2.2uF
VD D BU
C 16
100nF