Running the USB low speed evaluation board
UM0068
Figure 6.
Board schematics
PA5
PB7
PB6
PA7
PC
0
PB1
US
B
V
C
C
U
SB
DM
VS
S
A
V
PP
P
C
2
PB5
PB4
PB3
PB2
PA2
PA1
VD
DA
US
B
VC
C
US
B
D
P
US
B
D
M
VS
S
A
R
E
S
ET
PA
0
PA
1
PA
2
PA
3
PA
4
PA
5
PA
6
PA
7
PB
0
PB
1
PB
2
PB
3
PB
4
PB
5
PB
6
PB
7
PC
0
PC
1
VD
D
VS
S
O
S
C
IN
VP
P
VD
D
VSS
PC
1
PC
2
O
S
C
OU
T
PB0
PA4
PA4
RE
S
E
T
PA0
VDDA
PA1
PA6
OS
C
I
N
PA3
OS
C
OU
T
VSSA
PB2
VSS
PD4
PD2
PC3
PC6
PC7
PD3
PC
3
PC
4
PC
5
PC
6
PC
7
PD
0
PD
2
PD
3
PD
4
P
D
5
PD
6
PD
1
U
SB
DP
VD
D
A
USBVCC
PA2
PA5
PA6
PB0
PB3
PB7
OSCOUT
PC2
PC4
PD0
PD6
USBDP
USBDM
RESET
PA0
PA3
PA7
PB1
PB4
PB5
PB6
PC0
PC1
VDD
OSCIN
PC5
PD1
VPP
PD5
V
CC_
ARROW
R4
1
K
5
R6
2K
2
C
3
33
P
F
1
2
3
4
5
6
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
PD6
PD5
PD4
PD3
PD2
VPP
PD1
PD0
PC7
PC6
PC5
PC4
PC3
PC2
OSCIN
OSCOUT
VSS
VDD
PC1
PC0
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
RESET
VSSA
USBDM
USBDP
USBVCC
VDDA
W1B1
C4
33
P
F
C5
22
0N
F
LD
4
L
ED
re
d
LD
3
LE
D
re
d
LD
2
LE
D
re
d
W1
1
2
LD
1
LE
D
re
d
R8
47
0
R7
47
0
R6
47
0
S
T
7
2
6
3
U
2
1
1
5
3
2
4
1
6
7
9
1
0
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
6
2
7
8
2
8
3
0
2
9
3
1
32
V
PP
PC
2
O
SC
I
N
O
SC
O
U
T
VS
S
VD
D
P
C1
P
C0
PB
7
PB
6
P
B5
PB
4
P
B3
P
B
2
PB
1
PB
0
PA
7
PA
6
P
A5
PA
4
P
A
3
PA
2
PA
1
P
A0
R
ES
E
T
V
SS
A
U
SB
D
M
U
SB
D
P
U
SB
VC
C
V
DD
A
R5
47
0
C
2
10
N
F
4
7
K
S
T
72
62
ST
7
2
6
2
U
1
1
2
3
4
5
6
0
7
0
8
0
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
3
3
3
4
3
5
3
6
3
7
3
8
3
9
4
0
4
1
4
2
P
D6
P
D
5
P
D
4
PD
3
P
D2
VP
P
P
D
1
PD
0
P
C
7
P
C6
PC
5
P
C
4
P
C
3
P
C
2
O
SC
I
N
OS
C
O
U
T
VS
S
VD
D
PC
1
P
C
0
PB
7
PB
6
PB
5
PB
4
PB
3
PB
2
PB
1
PB
0
PA
7
PA
6
PA
5
PA
4
PA
3
PA
2
PA
1
PA
0
R
ES
ET
VS
S
A
US
B
DM
U
SB
D
P
US
BV
C
C
VD
D
A
X
T1
12
M
H
z
RES
E
T
SW
4
+
C
1
5
0
V
4
.7
U
F
1
2
+
C9
5
0
V
4
.7
U
F
1
2
+
C
6
5
0
V
4
.
7
UF
1
2
SW3
SW
3
SW
2
SW
2
CW
RV
1
10
K
C8
22
0N
F
W6
1
2
3
SW1
SW
1
47
K
2.
5
V
U3
S
T
6
6
2
A
2
3
4
1
5
6
7
8
C1
+
C2
-
C
2
+
C1
-
VC
C
VO
UT
GN
D
SH
D
N
US
B
J
1
1
2
3
4
C
7
10
0
N
F
BC
5
57
B
T
1
R1
47
K
W7
1
2
W2
1
2
W3
1
2
W4
1
2
W5
1
2
VCC_
ARROW
V
C
C_
A
R
RO
W
V
CC_
A
RROW
VCC
_
AR
RO
W
V
CC_
A
RROW
R2
R3
Summary of Contents for ST7MDTULS-EVAL
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