LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 34 / 97
Sending data to EG12 through USB will wake up the module.
When EG12 has a URC to report, the module will send remote wake-up signals via USB bus to wake
up the host.
3.5.1.3. USB Application with USB Suspend/Resume and RI Function
If the host supports USB suspend/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 the sleep mode.
Keep DTR at high level (pulled up by default).
Execute
AT+QSCLK=1
command to enable the sleep mode.
The host’s USB bus, which is connected with the module’s USB interface, has entered suspend
state.
The following figure shows the connection between the module and the host.
USB_VBUS
USB Interface
VDD
USB Interface
Module
Host
GND
GND
RI
EINT
Figure 6: Sleep Mode Application with RI
Sending data to EG12 through USB will wake up the module.
When EG12 has a URC to report, RI signal will wake up the host.
3.5.1.4. USB Application without USB Suspend Function
If the host does not support USB suspend function, USB_VBUS should be disconnected with an external
control circuit to let the module enter sleep mode.
Keep DTR at high level (pulled up by default).
Execute
AT+QSCLK=1
command to enable the sleep mode.
Disconnect USB_VBUS.