Power Saving; Sleep Mode; Uart Application - Quectel EG91 Series Hardware Design

Airplane AT+CFUN command or W_DISABLE# pin can set the module to enter airplane mode. In
Mode this case, RF function will be invalid.
In this mode, the current consumption of the module will be reduced to the minimal level.

Sleep Mode

During this mode, the module can still receive paging message, SMS, voice call and
TCP/UDP data from the network normally.
In this mode, the power management unit shuts down the power supply. Software is goes
Power Down
inactive. The serial interface is not accessible. Operating voltage (connected to
Mode
VBAT_RF and VBAT_BB) remains applied.

3.5. Power Saving

3.5.1. Sleep Mode
EG91 series module is able to reduce its current consumption to a minimum value during the sleep mode.
The following sub-chapters describe the power saving procedures of EG91 series module.
3.5.1.1.

UART Application

If the host communicates with the module via UART interface, the following preconditions can let the
module enter sleep mode.
 Execute AT+QSCLK=1 command to enable sleep mode.
 Drive DTR to high level.
The following figure shows the connection between the module and the host.
Driving the host DTR to low level will wake up the module.
 When EG91 series module has a URC to report, RI signal will wake up the host. Please refer to
Chapter 3.17 for details about RI behavior.
EG91_Series_Hardware_Design
Figure 3: Sleep Mode Application via UART
LTE Standard Module Series
EG91 Series Hardware Design
31 / 106