LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 33 / 104
The following figure shows the connection between the module and the host.
RXD
TXD
RI
DTR
TXD
RXD
EINT
GPIO
Module
Host
GND
GND
Figure 4: Sleep Mode Application via UART Interfaces
Driving the host DTR to low level will wake up the module.
When EG18 has a URC to report, RI signal will wake up the host. Please refer to
Chapter 3.16
for
details about RI behaviors.
3.4.1.2. USB Application with USB Remote Wakeup Function
If the host supports USB suspend/resume and remote wakeup function, the following three preconditions
must be met 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.
The host
’s USB bus, which is connected with the module’s USB interface, has entered into 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
Figure 5: Sleep Mode Application with USB Remote Wakeup
