Quectel SG368Z Series User Manual

Smart Module Series
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USB0_VBUS.
USB0 can be configured in the following three modes:
⚫ OTG mode (default): USB0 can switch automatically between Device mode and Host mode
according to the state of USB0_ID. If USB0_ID is at high level, USB0 is in Device mode, and if
USB0_ID is at low level, USB0 is in Host mode. In Device mode, the module can judge whether the
USB0_VBUS pin is at high level. If it is, USB0_DP will be pulled up to start enumeration.
⚫ Device mode: When USB0 is configured to this mode, there is no need to pay attention to the state of
USB0_ID. The module only needs to judge whether the USB0_VBUS pin is at high level. If it is,
USB0_DP will be pulled up to start enumeration.
⚫ Host mode: When USB0 is configured to this mode, there is no need to pay attention to the states of
USB0_ID and USB0_VBUS. (If you only need Host mode, but you also need to use
USB0_DP/USB0_DM for system firmware burning during debugging and production, then you need
to configure USB0 to Device mode during burning and ABD debugging. Under this condition,
USB0_VBUS signal must be connected.)
⚫ Before Uboot starts, USB0 is in Device mode by default; after Uboot starts, USB0 can be configured
to the above three modes according to demand.
The reference design of Micro USB interface realized by USB0 is shown below:
EN
VIN
5V_OUT
GND
10K
USB0_DP
USB0_DM
USB0_VBUS
USB0_ID
1
2
3
4
5
USB_DP
USB_DM
VBUS
USB_ID
GND
GND GND
GND GND
6 7
8 9
15K
Module
GPIO
VIN
C1
C2
POWER IC
R1
Schottky
10K
R2
R3 ESD ESD ESD ESD
100 nF
C3
R2
100 Ω
Figure 8: Reference Design of Micro USB Interface
.
1. To suppress electromagnetic radiation, common-mode chokes (common-mode choke coil) can be
added on the USB0_DP/USB0_DM signals, and other USB 2.0 interfaces can also refer to this
NOTE

Quectel SG368Z Series Specifications

General

Brand	Quectel
Model	SG368Z Series
Category	Control Unit
Language	English