Power Saving; Minimum Functionality Mode; Flight Mode - SimCom SIM5218E Hardware Design

SIM5218E Hardware Design
If the measured battery voltage is no more than 3.4V, the following URC will be presented:
POWER LOW DOWN
After this moment, no further more AT commands can be executed. The module will log off from
network and enters POWER DOWN mode, only the RTC is still active (if backup battery is
connected to VRTC pin).
Notes: This feature is disable default, Use AT command to enable this feature, please refer to AT
command manual.

3.5 Power saving

There are two methods to achieve SIM5218E module extreme low power. "AT+CFUN" is used to
set module into minimum functionality mode and GPIO4 hardware interface signal can be used to
set system to be Flight mode (Close RF).

3.5.1 Minimum functionality mode

Minimum functionality mode reduces the functionality of the module to a minimum and, thus,
minimizes the current consumption to the lowest level. This mode is set with the "AT+CFUN"
command which provides the choice of the functionality levels <fun>=0，1，4
0: minimum functionality;
1: full functionality (Default);
4: disable phone both transmit and receive RF circuits;
If SIM5218E has been set to minimum functionality by "AT+CFUN", then the RF function and
SIM card function will be closed, in this case, the serial port is still accessible, but all AT
commands need RF function or SIM card function will not be accessible.
If SIM5218E has disabled all RF function by "AT+CFUN", then RF function will be closed, the
serial port is still active in this case but all AT commands need RF function will not be accessible.
When SIM5218E is in minimum functionality or has disabled all RF functionality by
"AT+CFUN", it can return to full functionality by "AT+CFUN".

3.5.2 Flight mode

Through GPIO4 signal control SIM5218E module to enter or exit the Flight mode in customer
applications. In Flight mode, SIM5218E close RF function. If left GPIO4 open, SIM5218E enter
normal mode.
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11.06.2009