Sunsea AIoT SIMCom SIM7075G User Manual page 51

Extended Mode DRX (e-DRX)
5.3.2 Sleep mode
Module can enter into sleep mode for reducing its power consumption in idle module. In sleep mode, the
current consumption of module will be reduced to very small level, and module can still receive paging
message and SMS.
Several hardware and software conditions must be satisfied together in order to let SIM7075G enter sleep
mode:
USB condition: Connected USB can't enter into sleep mode. So if module wants to enter into sleep

mode, it must disconnect the power supply for USB_VBUS first.
Software condition: If module wants to enter into sleep mode, AT comment "AT+CSCLK=1" must be set

to close some clock in the module. If the value "AT+CSCLK" is "0", module will never enter into sleep
mode.
UART condition: If module wants to enter into sleep mode, AT comment "AT+CSCLK=1" must be set to

close some clock in the module. If the value "AT+CSCLK" is "0", module will never enter into sleep
mode.
If it meets all the conditions at the same time, module will enter into sleep mode. In sleep mode, the UART
is unavailable. If the host need to communicate with module, it need to pull down DTR can wake up module.
5.3.3 Minimum functionality mode and Flight mode
Minimum functionality mode ceases a majority function of the module, thus minimizing the power
consumption. This mode is set by the AT command which provides a choice of the functionality levels.
AT+CFUN=0: Minimum functionality

AT+CFUN=1: Full functionality (Default)

AT+CFUN=4: Flight mode

If SIM7075G has been set to minimum functionality mode, the RF function and SIM card function will be
closed. In this case, the serial port and USB are still accessible, but RF function and SIM card will be
unavailable.
If SIM7075G has been set to flight mode, the RF function will be closed. In this case, the serial port and
USB are still accessible, but RF function will be unavailable.
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In this mode, The mode is similar to power-off. But the module
remains registered on the network and there is no need to re-attach or
re-establish the network connections. And all of the functions will be
unavailable except the RTC function. PWRKEY and timer expires can
wake up the module.
In idle or sleep mode, module and the network may negotiate over
non-access stratum signaling the use of extended mode DRX for
reducing power consumption.
SIM7075G User Manual V1.00
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