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SIM7020_Hardware_Design_V1.02 36 2018-07-25
the module will not work, but the serial port and USB port are still
acces
sible. The power consumption in this mode is lower than normal
mode.
PSM mode
In this mode, the module will be the least current consumption.
Meanwhile
, all the output of the LDO and DCDC in the module will be
closed except the RTC power. And also all of the functions will be
unavailable except the RTC function. In PSM, RTC_GPIO0 will
change state from high to low. RTC_EINT or PWRKEY can wake
Power off mode
Module will go into power off mode by sending the AT command
“AT+ C P OWD ” or pull down the PWRKEY pin, normally. In this
mode the power management unit shuts down the power supply, and
software is not active. The serial port and USB are is not accessible.
5.3.2 Sleep mode
In sleep mode, the current consumption of module will be reduced to the minimal level, and module
can still receive paging message and SMS.
Several hardware and software conditions must be satisfied together in order to let SIM7020 enter
sleep mode:
1. UART condition
2. USB condition
3. Software condition
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 SIM7020 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 SIM7020 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 SIM7020 is in minimum functionality or flight mode, it can return to full functionality by the
AT command “AT+CFUN=1”.
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