Quectel LTE Standard Module Series User Manual

LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 29 / 100
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module
Host
GND
GND
Figure 4: Sleep Mode Application with USB Remote Wakeup
 Sending data to EG21-G through USB will wake up the module.
 When EG21-G has a URC to report, the module will send remote wake-up signals via USB bus so as
to wake up the host.
3.5.1.3. USB Application with USB Suspension/Resume and RI Function
If the host supports USB suspension and resume, but does not support remote wake-up function, the RI
signal is needed to wake up the host.
There are three preconditions to let the module enter into the sleep mode.
 Execute AT+QSCLK=1 command to enable the sleep mode.
 Ensure the DTR is held at high level or keep it open.
 The host’s USB bus, which is connected with the module’s USB interface, enters into suspension
state.
The following figure shows the connection between the module and the host.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module Host
GND
GND
RI
EINT

Quectel LTE Standard Module Series Specifications

General

Brand	Quectel
Model	LTE Standard Module Series
Category	Wireless modules
Language	English