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SIM7000 _Hardware Design _V1.04 2018-1-31
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 SIM7000 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 SIM7000 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 SIM7000 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.
When SIM7000 is in minimum functionality or flight mode, it can return to full functionality by the
AT command “AT+CFUN=1”.
5.3.4 Power Saving Mode (PSM)
SIM7000 module can enter into PSM for reducing its power consumption. The mode is similar to
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