SIM802 Hardware Design
Please refer to
document [1]
for detail about the AT command of “AT+CPOWD”.
3.4.2.3 Over-voltage or under-voltage automatic shutdown
The module will constantly monitor the voltage applied on the VBAT. If the voltage
≤
3.5V, the
following URC will be presented:
UNDER-VOLTAGE WARNNING
If the voltage
≥
4.5V, the following URC will be presented:
OVER-VOLTAGE WARNNING
The uncritical voltage range is 3.4V to 4.6V. If the voltage
≥
4.6V
or
≤
3.4V, the module will
be automatic shutdown soon.
If the voltage
≤
3.4V, the following URC will be presented:
UNDER-VOLTAGE POWER DOWN
If the voltage
≥
4.6V, the following URC will be presented:
OVER-VOLTAGE POWER DOWN
After this moment, no further more AT commands can be executed. The module logs off from
network and enters POWER DOWN mode, and only the RTC is still active. POWER DOWN can
also be indicated by STATUS Pin, which is a low level voltage in this mode.
3.4.2.4 Over-temperature or under-temperature automatic shutdown
The module will constantly monitor the temperature of the module, if the temperature
≥
85
℃
,
the following URC will be presented:
+CMTE:1
If the temperature
≤
-40
℃
, the following URC will be presented:
+CMTE:-1
The uncritical temperature range is -45
℃
to 90
℃
. If the temperature
≥
90
℃ or
≤
-45
℃
, the
module will be automatic shutdown soon.
If the temperature
≥
90
℃
, the following URC will be presented:
+CMTE:2
If the temperature
≤
-45
℃
, the following URC will be presented:
+CMTE:-2
SIM802_HD_V2.01
12.01.2010
31
