LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 32 / 97
3.5. Power Saving
3.5.1. Sleep Mode
DRX of EG12 is able to reduce the current consumption to a minimum value during the sleep mode, and
DRX cycle index values are broadcasted by the wireless network. The figure below shows the relationship
between the DRX run time and the current consumption in sleep mode. The longer the DRX cycle is, the
lower the current consumption will be.
C
u
rr
e
n
t
C
o
n
s
u
m
p
ti
o
n
Run Time
DRX OFF ON OFF
ON OFF ON OFF ON OFF
Figure 3: DRX Run Time and Current Consumption in Sleep Mode
The following section describes power saving procedure of EG12.
3.5.1.1. UART Application
If the host communicates with the module via UART interfaces, the following preconditions can let the
module enter sleep mode.
Keep DTR at high level (pulled up by default).
Execute
AT+QSCLK=1
command to enable sleep mode.
Airplane Mode
AT+CFUN=4
command or driving W_DISABLE# low 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 interfaces are not accessible. Operating voltage (connected to
VBAT_RF and VBAT_BB) remains applied.
