Turn Off Sim5218E - SimCom SIM5218E Hardware Design

SIM5218E Hardware Design

3.4.2 Turn off SIM5218E

Following procedure can be used to turn off the SIM5218E:
Normal power down procedure: Turn off SIM5218E using the POWER_ON pin
Normal power down procedure: Turn off SIM5218E using AT command
3.4.2.1 Turn off SIM5218E using the POWER_ON pin (Power down)
You can turn off the SIM5218E by driving the POWER_ON to a low level voltage for period
time. The low level period of the POWER_ON is about 64mS.
This procedure will let the module to log off from the network and allow the software to enter into
a secure state and save data before completely disconnect the power supply.
3.4.2.2 Turn off SIM5218E using AT command
You can use an AT command "AT+CPOF" to turn off the module. This command will let the
module to log off from the network and allow the software to enter into a secure state and save
data before completely disconnect the power supply.
After this moment, the AT commands can't be executed. The module enters the POWER DOWN
mode, only the RTC is still active.
Please refer to for detail about the AT command of " AT+CPOF " .
3.4.2.3 Under-voltage automatic shutdown
Software will constantly monitor the voltage applied on the VBAT, if the measured battery voltage
is no more than 3.5V, the following URC will be presented:
POWER LOW WARNNING
SIM5218E_HD_V1.03
Figure 6: Automatic power on
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11.06.2009