Power Saving Mode; Minimum Functionality Mode; Sleep Mode 1 (At+Csclk=1) - SimCom SIM800C Hardware Design

3) Power on the module.
P W R K E Y

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).
 AT+CFUN=4： Flight mode (disable RF function).
Table 7: The current consumption of Function Mode
<fun>
0
1
4
Minimum functionality mode minimizes the current consumption to the lowest level. If SIM800C is set to
minimum functionality by "AT+CFUN=0", the RF function and SIM card function will be disabled. In this
case, the serial port is still accessible, but partial AT commands and correlative to RF function and SIM card
function will not be accessible.
For detailed information about AT command "AT+CFUN=<fun>", please refer to document [1].
4.3.2.

Sleep Mode 1 (AT+CSCLK=1)

Customer can control SIM800C module to enter or exit the sleep mode (AT+CSCLK=1) by DTR signal. When
DTR is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in serial port),
SIM800C will enter sleep mode automatically. In this mode, SIM800C can still receive paging or SMS from
network but the serial port is not accessible.
SIM800C_Hardware_Design_V1.02
1s<T <2s
1
S T A T U S
T ≥ 2s
2
Figure 14: Timing of restart SIM800C
T >800m s
3
Current consumption(mA) (sleep mode)
0.6
0.88
0.65
22
Smart Machine Smart Decision
2015-4-27