Usb Application - Quectel EG060K Series Hardware Design

3.1.1.2. USB Application

USB application can be applied with USB remote wake-up function or USB suspend/resume and RI
functions.
⚫
If the host supports USB suspend/resume and remote wake-up function, meeting the following three
requirements will bring the module into sleep mode.
-
Keep MAIN_DTR high (pulled up by default).
-
Execute AT+QSCLK=1 command. See document [4] for details about AT+QSCLK=1.
The host's USB bus, connected to the module's USB interface, has entered suspend state.
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The following figure shows the above-mentioned connection between the module and the host.
Figure 5: Sleep Mode Application with USB Remote Wake-up
Sending data to the module through USB will wake up the module. When the module has a URC to
report, the module will send remote wake-up signals via USB bus to awaken the host.
⚫
If the host supports USB suspend/resume but does not support remote wake-up function, meeting
the following three requirements will bring the module into sleep mode.
-
Keep MAIN_DTR high (pulled up by default).
-
Execute AT+QSCLK=1 command. See document [4] for details about AT+QSCLK=1.
The host's USB bus, connected with the module's USB interface, has entered suspend state.
-
The following figure shows the connection between the module and the host.
EG060K &EG120K _Series_Hardware_Design
103
Module
USB_VBUS
USB Interface
GND
LTE-A Module Series
Host
VDD
USB Interface
GND
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