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

Mode
AT+CFUN command or W_DISABLE# pin can set the module to enter into airplane mode.
Airplane
In this case, RF function will be invalid.
Mode
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 not
Power Down
active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF
Mode
and VBAT_BB) remains applied.

3.5. Power Saving

3.5.1. Sleep Mode
EG91 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 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 into 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.
EG91_Hardware_Design
Module
RXD
TXD
RI
DTR
AP_READY
GND
Figure 3: Sleep Mode Application via UART
LTE Standard Module Series
EG91 Hardware Design
Host
TXD
RXD
EINT
GPIO
GPIO
GND
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