SIM800H datasheet(24/73 Pages) SIMCOM

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SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

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 can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

4.2.2.2. Power down SIM800H&SIM800L by AT Command

SIM800H&SIM800L 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 the completion of the power down procedure, the module will send URC:

NORMAL POWER DOWN

At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

For detail about AT command “AT+CPOWD”, please refer to document [1].

4.2.2.3. Over-Voltage or Under-Voltage Power Down

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 down.

UNDER-VOLTAGE POWER DOWN

If the voltage > 4.4V, the following URC will be reported, and the module will be automatically powered down.

OVER-VOLTAGE POWER DOWN

At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

4.2.2.4. Over-Temperature or Under-Temperature Power Down

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, and only the RTC is still active. Power down

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