SIM Tech SIMCom SIM800C User Manual (English)

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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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SIM Tech SIMCom SIM800C Specifications

General

Module Type	GSM/GPRS Module
Frequency Bands	GSM 850/900/1800/1900 MHz
GPRS mobile station	Class B
Compliant to GSM phase	2/2+
USSD	Supported
Operating Temperature	-40°C to +85°C
Product Type	GSM/GPRS Module
GPRS Class	Class 12
Coding scheme	CS-1, CS-2, CS-3 and CS-4
SMS	Text and PDU modes
Interfaces	UART, SPI, I2C, GPIO, ADC
Power Supply	DC
Supply voltage range	3.4V to 4.4V
Transmitting power	Class 4 (2W) @850/900MHz, Class 1 (1W) @1800/1900MHz
Data Rate	GPRS multi-slot class 12: max. 85.6 kbps (uplink & downlink)
TCP/IP	Embedded TCP/IP stack