Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 44 / 130
USB_DP
USB_DM
USB_VUSB
1
2
3
4
5
USB_DP
USB_DM
VUSB
USB_ID
GND
GND GND
GND GND
6 7 8
9
100nF
Module
C1
D1
D2 D3
ESD ESD ESD
Figure 13: USB Interface Reference Design (OTG is not Supported)
10uF
EN
VIN
SW
NC
VOUT
VOUT
4
5
1
7
8
6
2 9 3
AGND PGND PGND
10K
22uF/
10V
1.0uH
AW3605DNR
USB_DP
USB_DM
USB_VUSB
USB_ID
1
2
3
4
5
USB_DP
USB_DM
VUSB
USB_ID
GND
GND GND
GND GND
6 7 8
9
100nF
Module
VBAT
GPIO
VBAT
C1
C2
L1
U1
R1
C3
D1 D2
D3
D4
ESDESDESD
ESD
Figure 14: USB Interface Reference Design (OTG is Supported)
SC20 supports OTG protocol. If OTG function is needed, please refer to the above figure for the reference
design. AW3605DNR is a high efficiency DC-DC chip manufactured by AWINIC, and customers can
choose according to their own demands.
In order to ensure USB performance, please comply with the following principles while designing USB
interface.
⚫ It is important to route the USB signal traces as differential pairs with total grounding. The impedance