User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 28 / 90
3.4. Operating Modes
The table below briefly summarizes the various operating modes referred in the following chapters.
Table 5: Overview of Operating Modes
Mode Details
Normal
Operation
Idle
Software is active. The module hasregistered onthe 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 settingand 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 USIM 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
EC25 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes power saving procedure of EC25 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=1command to enable sleep mode.
 Drive DTR to high level.