Quectel SG368Z-AP User Manual

Smart Module Series
SG368Z_Series_Hardware_Design 44 / 113
4.1.3. USB Interface Design Considerations
Table 12: USB Interface Trace Length Inside the Module (Unit: mm)
To ensure performance, you should follow the following principles when designing USB interfaces:
⚫ Route USB signal traces as differential pairs with surrounded ground. The impedance of USB
differential trace is 90 Ω.
⚫ Route USB differential traces at the inner-layer of the PCB, and surround the traces with ground on
that layer and ground planes above and below. For signal traces, provide clearance from power
supply traces, crystal-oscillators, magnetic devices, sensitive signals like RF signals, analog signals,
and noise signals generated by clock, DC-DC, etc.
⚫ The reference ground plane under the USB signal traces must be continuous without any cuts or vias
Pin Name
Pin No.
Length
Length Matching (P-M)
USB0_DP
112
31.89
0.09
USB0_DM
113
31.80
USB0_SS_TX_P
107
34.35
-0.03
USB0_SS_TX_M
108
34.38
USB0_SS_RX_P
109
31.63
0.08
USB0_SS_RX_M
110
31.55
USB1_DP
79
21.90
0.09
USB1_DM
83
21.81
USB1_SS_TX_P
84
22.27
-0.18
USB1_SS_TX_M
88
22.45
USB1_SS_RX_P
89
26.00
-0.12
USB1_SS_RX_M
92
26.12
USB2_DP
289
43.18
0.18
USB2_DM
292
43.00
USB3_DP
295
42.56
0.25
USB3_DM
297
42.31

Quectel SG368Z-AP Specifications

General

Brand	Quectel
Model	SG368Z-AP
Category	Control Unit
Language	English