Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 33 / 100
The following section describes power saving procedure of EG12.
3.5.1.1. UART Application
If the host communicates with the module via UART interfaces, the following preconditions can let the
module enter into sleep mode.
 Keep DTR at high level (pulled up by default).
 Execute AT+QSCLK=1 command to enable sleep mode.
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 EG12 has a URC to report, RI signal will wake up the host. Please refer to Chapter 3.17 for
details about RI behavior.
3.5.1.2. 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 into 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 into suspend
state.
The following figure shows the connection between the module and the host.