SimCom SIM5300E Hardware Design page 27

PWRKEY
(Input)
STATUS
(Output)
Serial Port
Figure 13: Timing of power down SIM5300E by PWRKEY
This procedure makes the module to log off from the network and allows the software to enter a secure
state to save data before completely shut down.
Before the completion of the power down procedure, the module will send URC:
NORMAL POWER DOWN
At this moment, AT commands cannot be executed any more, and only the RTC is still active. Power down
mode can also be indicated by STATUS pin, which is at low level at this time.
SIM5300E can be powered down by AT command "AT+CPOWD=1". This procedure makes the module to log
off from the network and allows the software to enter a secure state to save data before completely shut
down.
Before the completion of the power down procedure, the module will send URC:
NORMAL POWER DOWN
At this moment, AT commands cannot be executed any more, and only the RTC is still active. Power down
mode can also be indicated by STATUS pin, which is at low level at this time.
For details about the AT command "AT+CPOWD", please refer to document [1].
The module software monitors the VBAT voltage constantly.
If the voltage ﹤ 3.5V, the following URC will be reported:
UNDER-VOLTAGE WARNNING
SIM5300E_Hardware_Design_V1.02
5S> Pulldown >1S
V < 0.54V
IL
Active
POWER DOWN SIM5300E BY AT COMMAND
OVER-VOLTAGE OR UNDER-VOLTAGE POWER DOWN
V > 1.26V
IH
V
OH
< 0.2V
Undefined
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