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The USB2 interface of the module only supports USB host mode. If you need this function, follow the
design below to add an external 5 V power supply, which can provide 500 mA current.
VBAT
C1
10 μF
GPIO_156
To ensure USB performance, please comply with the following principles while designing the USB
interface.
⚫
It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential traces is 90 Ω.
⚫
Keep the ESD protection devices as close as possible to the USB connector. Pay attention to the
influence of junction capacitance of ESD protection devices on USB data traces. Typically, the
capacitance value should be less than 2 pF.
⚫
Do not route signal traces under crystals, oscillators, magnetic devices or RF signal traces. Route the
USB differential traces in inner-layer with ground shielding on not only the upper and lower layers but
also the right and left sides.
⚫
Make sure the trace length difference of USB 2.0 differential data traces is less than 0.7 mm.
Table 12: USB Trace Length Inside the Module
Pin
Signal
13
USB_DM
14
USB_DP
173
HUB_USB_DP
174
HUB_USB_DM
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
1.0 μH
L1
R2
10K
NM
R3
R1
NM
Figure 14: Reference Design for USB2 Power Supply
Length (mm)
14.94
15.42
17.66
17.78
AW3605DNR
4
SW
7
VOUT
8
5
VOUT
VIN
1
6
EN
NC
Length Difference (DP - DM)
0.48
-0.12
Smart Module Series
USB_VBUS2
C2
22 μF
42 / 111
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