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Figure 2-2: Power supply schematic
VCC-5V
FP1
FERRITE
C5
100nF
1
2
3
4
5
GND
ID
D+
D-
VBUS
CN1
USB
MINIB
3.3V VOLTAGE REGULATOR
R10
470
PWR
VCC-3.3
VCC-3.3
C1
2
2.
2u
F
R5
39K
R3
287K
1
2
3
IN
GND
OUT
5
4
EN ADJ
U2
AP7331-ADJ
C13
10uF
VCC-5V
1
2
3
4
5
6
7
8
9
10
HD2
VCC-3.3