Schematics
UM0882
Doc ID 16881 Rev 2
Figure 14.
Microcontroller, USB, power supply
VDD_
2
36
VSS_2
35
P
A13
34
P
A12
33
P
A11
32
P
A10
31
PA
9
30
PA
8
29
P
B15
28
P
B14
27
P
B13
26
P
B12
25
V
BA
T
1
P
C13
2
P
C14
3
P
C15
4
PD
0_OSC-I
N
5
PD
1_OSC-OUT
6
NRST
7
VSSA
8
VDD
A
9
P
A
0-WK
UP
10
PA
1
11
PA
2
12
VDD_
3
48
VSS_
3
47
PB
9
46
PB
8
45
PB
7
43
PB
6
42
PB
5
41
PB
4
40
PB
3
39
P
A15
38
P
A14
37
BOO
T
0
44
PA
3
13
PA
4
14
P
A5-CLK(SPI1
)
15
P
A6-
MI
SO(SPI1)
16
PB
0
18
PB
1
19
PB
2
20
PB10
21
PB11
22
P
A7-
MO
SI(SPI1)
17
V
SS_
1
23
VDD_
1
24
STM32
U3
STM32F103Cx
(C6T6)
3.3 V
3.3 V
3.3 V
3.3 V
SD
I
SD
O
CL
K
USBDP
USBDN
VIN_
A
1
EN
2
FB
3
SW
7
SYNC
5
A
GND
4
PGND
8
VIN_SW
6
ST1S10
9
U4
ST1S10
ceramic
25 V
(35 V)
(C
,D
,E)
C1
4.7 µF
(10 µF)
MSS7341-332NLB
coil cr
aft
L1
2.2 µF
tantal
16 V
(10 V)
(D)
C4
100 µF
(47 µF)
siz
e D
,
16 V
R18
5.6 k
Ω
R19
1.2 k
Ω
4.5 V
JTMS
JTCK
JT
DI
JT
DO
JTRS
T
JTRS
T
JRST
LE
R25
100 K
Ω
C5
4.7 nF
3.3 V
P
C13
1
3
2
CN
5
GM:
K375A
D1
8
ST
: SM6T18A
C
AD
C
2
3
1
4
D1
7
br
idge LH
D1
1
GND
2
D2
3
D3
4
V
CC
5
D4
6
V
CC
1.5 k
Ω
33
Ω
33
Ω
U6
USB_ESD
P
C14
P
C15
C3
100 nF
C2
470 nF
V
BU
S
1
D–
2
D+
3
GND
4
SHL
D
5
J1
440247-
2
EXTCLK
CLK
OUT
USRX
USTX
USDI
R
PW
CL
K
TIM2ETR
TIM2CH
2
AM00673
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