Power Saving; Sleep Mode - Quectel EG91 Series Hardware Design

Table 5: Overview of Operating Modes
Mode Details
Idle
Normal
Operation
Talk/Data
Airplane AT+CFUN=4 or W_DISABLE# pin can set the module to enter airplane mode. In this
Mode case, RF function will be invalid.
Minimum
AT+CFUN=0 can set the module to a minimum functionality mode without removing the
Functionality
power supply. In this case, both RF function and (U)SIM card will be invalid.
Mode
In this mode, the current consumption of the module will be reduced to the minimal

Sleep Mode

level. 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
Power Down
goes inactive. The serial interface is not accessible. Operating voltage (connected to
Mode
VBAT_RF and VBAT_BB) remains applied.
For details of the above AT command, see document [3].

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 to enable sleep mode.
 Drive DTR to high level.
The following figure shows the connection between the module and the host.
EG91_Series_Hardware_Design
Software is active. The module has registered on network, and it is
ready to send and receive data.
Network is connected. In this mode, the power consumption is decided
by network setting and data transfer rate.
LTE Standard Module Series
32 / 105