LTE Standard Module Series
EC200U_Series_Hardware_Design 27 / 94
Minimum
Functionality
Mode
AT+CFUN=0 can set the module to a minimum functionality mode without removing
the power supply. In this case, RF function will be invalid.
AT+CFUN=4 or W_DISABLE# can set the module to airplane mode. In this case, RF
function will be invalid.
In this mode, the current consumption of the module will be reduced to the minimal
level. In 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 (PMU) shuts down the power supply.
Software is not active, the serial interface is not accessible, while operating voltage
(connected to VBAT_RF and VBAT_BB) remains applied.
3.5. Power Saving
3.5.1. Sleep Mode
The module is able to reduce its current consumption to a minimum value in sleep mode. The following
section describes power saving procedures of the module.
3.5.1.1. UART Application
If the host communicates with module via UART interface, the following preconditions should be met to let
the module enter sleep mode.
⚫ Execute AT+QSCLK=1 to enable sleep mode.
⚫ Drive MAIN_DTR to high level.
The following figure shows the connection between the module and the host.
MAIN_RXD
MAIN_TXD
MAIN_RI
MAIN_DTR
AP_READY
TXD
RXD
EINT
GPIO
GPIO
Module
Host
GND
GND
Figure 3: Sleep Mode Application via UART
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