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Figure 7-2: USB module connection schematic
VCC-USB
US
B-
D_
P
US
B-
D_
N
VCC-3.3V
VCC-3.3V
USB-D_P
USB-D_N
GPIO135
GPIO225
D_N
D_P
GPIO171
GPIO170
R32
4.7k
R31
2.2k
LD5
LD6
R33
10k
C35
0.1µF
R25
1M
R35
27
R34
27
1
2
3
4
5
ID
D+
D-
VBUS
GND
CN2
USB MICRO
VCCIO
RXD
GND
CTS
CB
2
RST
VCC
CB1
CB0
GN
D
RT
S
TX
D
CB
3
DP DM 3V
3
GND PAD
U4
FT230x
FP2
C26
10000pF
R24 8.2k
R36
4.7k
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