LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 27 / 100
Table 5: Overview of Operating Modes
Mode
Details
Normal
Operation
Idle
Software is active. The module has registered on the network, and it is
ready to send and receive data.
Talk/Data
Network connection is ongoing.
In this mode, the power consumption is
decided by network setting and data transfer rate.
Minimum
Functionality
Mode
AT+CFUN
command can set the module to a minimum functionality mode without
removing the power supply. In this case, both RF function and (U)SIM card will be
invalid.
Airplane Mode
AT+CFUN
command or W_DISABLE# pin can set the module to airplane mode. In
this case, RF function will be invalid.
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal
level. During this mode, the module can still receive paging message, SMS, voice call
and TCP/UDP data from the network normally.
Power Down
Mode
In this mode, the power management unit shuts down the power supply. Software is
not active. The serial interface is not accessible. Operating voltage (connected to
VBAT_RF and VBAT_BB) remains applied.
3.5.
Power Saving
3.5.1.
Sleep Mode
EG21-G is able to reduce its current consumption to a minimum value during the sleep mode. The
following section describes power saving procedures of EG21-G module.
3.5.1.1. UART Application
If the host communicates with 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.
