Smart Machine Smart Decision
SIM800C_Hardware_Design_V1.00 22 2014-10-30
The module will constantly monitor the temperature of the module,
If the temperature ≥ +80℃, the following URC will be reported:
+CMTE: 1
If the temperature ≤ -30℃, the following URC will be reported:
+CMTE:-1
If the temperature > +85℃, the following URC will be reported, and the module will be automatically powered
down.
+CMTE: 2
If the temperature < -40℃, the following URC will be reported, and the module will be automatically powered
down.
+CMTE:-2
At this moment, AT commands can not be executed any more. Power down mode can also be indicated by
STATUS pin, which is at low level at this time.
Note
：
The default temperature detect is disable, AT command “AT+CMTE” could be used to read the
temperature when the module is running.For details please refer to document [1].
4.2.2.5. Restart SIM800C by PWRKEY Pin:
When the module works normally, if the customer wants to restart the module, follow the procedure below:
1) Power down the module.
2) Wait for at least 800ms after STATUS pin changed to low level.
3) Power on the module.
PWRKEY
Power down
STATUS
Delay>800ms
Restart
Figure 14: Timing of restart SIM800C
4.3. Power Saving Mode
SIM800C has two power saving modes: Minimum functionality mode and sleep mode. AT command
“AT+CSCLK=1”can be used to set SIM800C into sleep mode. AT command “AT+CFUN=<fun>“can be used to
set SIM800C into minimum functionality. When SIM800C is in sleep mode and minimum functionality mode,
the current of module is lowest.
4.3.1. Minimum Functionality Mode
There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command
provides the choice of the functionality levels <fun>=0, 1, 4.
AT+CFUN=0： Minimum functionality.
AT+CFUN=1： Full functionality (default).
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