SIM5218E Hardware Design
Figure 5: Timing of turn on system
Note1: Ton >= 64ms.
Note2: Commonly, the AT command can be set after 2-3S after the SIM5218E is powered on.
Note3: Module could be automatically power on by connecting Power ON pin to Low level
directly. Before designing, please refer to Document [24] for more detail.
3.4.2 Turn off SIM5218E
Following procedures can be used to turn off the SIM5218E:
z
Normal power down procedure: Turn off SIM5218E using the POWER_ON pin
z
Normal power down procedure: Turn off SIM5218E using AT command
3.4.2.1 Turn off SIM5218E using the POWER_ON pin (Power down)
User 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 be logged off from the network and allow the software to
enter into a secure state and save data before completely disconnecting the power supply.
3.4.2.2 Turn off SIM5218E using AT command
User
can use an AT command
“AT+CPOF”
to turn off the module. This command will let the
module to be logged off from the network and allow the software to enter into a secure state and
save data before completely disconnecting 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 AT command manual for details of the AT command “AT+CPOF”.
SIM5218E_ Hardware Design_V1.06
2012.09.21
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