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28
USB1 D-
30
USB1 D+
32
GND
34
NC
Table 1.3.1-2 Signal Description for USB in SMD 64-Pin
1.3.2 Schematic Guidelines
Considering EMI and ESD issue, the common mode choke and TVS (Transient Voltage
Suppression) diode with low capacitance, which should be less than 1.0pF, are the
recommendatory solution. For placement concern, EMI and ESD solution should be
close to connector.
CPU
CN
Board
USB_D-
USB_D+
Figure 1.3.2-1 EMI and ESD demonstration for USB Application
I/O USB2
I/O USB2
GND
I/O Board
B52
1
4
2
3
90_100MHZ
+V5_USB
EMI Solution
ESD Protection close to connector
close to connector
GND
+V5_USB
C210
0.1uF
16V
USB_z_D-
USB_z_D+
C211
0.1uF
16V
D6
AZC099
GND_Chasis
12
USB2 Data-
USB2 Data+
GND
CN29
1
+5V
2
DATA-
3
DATA+
4
GND
GND_Chasis
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