User manual
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.
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
supp
ly. Its output is used for VDDCORE and VDDPLL. Test point TP10 is used to perform testing.
Figure 4-8. 1V Su
pply
4.3.6 Battery Backup
VDDBU pin is powered from the 3.3V rail and a backup bat
tery BT1 via a dual Schottky diode D1. Test
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
TP 7
VDDNF
L5
220ohm at 100MHz
1 2
C9
10uF
C8
4.7uF
+5V +1V8
MN2
LP38692MP-1.8
VIN
4
VOUT
3
VEN
1
NC
2
GND
5
VDDIOM
TP 6
L4
220ohm at 100MHz
1 2
TP 8
TP10
+1V
C144
100nF
C11
10uF
ADP1715
MN3
ADP1715ARMZ
GND
6
GND
5
OUT
3
EN
1
ADJ
4
GND
7
IN
2
GND
8
R10
12K 1%
C10
10uF
C143
10nf
C147
22pF
R13
47K 1%
+3V3
JP2
+3V3
BT1
D1
BAT54C
3
2
1
TP13
C18
2.2uF
VDDBU
C16
100nF