Data Sheet

Smart Machine Smart Decision
SIM800F_Hardware Design_V1.00 24 2015-07-31
Note:
1. If the PWRKEY pull down time exceeds 33s, SIM800F module will power up again.
2. VDD_EXT will be turned off after PWRKEY was released for at least 55ms and STATUS was changed to low.
If 1s<T1<2s, then T2≥2s
If 2s≤T1<33s, then T2>T1+55ms
This procedure makes the module log off from the network and allows the software to enter into a secure state to
save data before completely shut down.
Before the completion of the power off procedure, the module will send URC:
NORMAL POWER OFF
At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode
can also be indicated by STATUS pin, which is at low level at this time.
4.2.2.2 Power off SIM800F by AT Command
SIM800F can be powered down by AT command “AT+CPOWD=1”. This procedure makes the module log off
from the network and allows the software to enter into a secure state to save data before completely shut down.
Before completing the power off procedure, the module will send URC:
NORMAL POWER OFF
At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off 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]
.
4.2.2.3 Over-voltage or Under-voltage Power off
The module software monitors the VBAT voltage constantly.
If the voltage  3.5V, the following URC will be reported:
UNDER-VOLTAGE WARNNING
If the voltage  4.3V, the following URC will be reported:
OVER-VOLTAGE WARNNING
If the voltage < 3.4V, the following URC will be reported, and the module will be automatically powered off.
UNDER-VOLTAGE POWER OFF
If the voltage > 4.4V, the following URC will be reported, and the module will be automatically powered off.
OVER-VOLTAGE POWER OFF
At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode
can also be indicated by STATUS pin, which is at low level at this time.
4.2.2.4 Over-temperature or Under-temperature Power off
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