Smart Machine Smart Decision
SIM800_Hardware Design_V1.10
26
2018-08-13
Table 6: Electronic characteristic of the RESET Pin
Pin name
Symbol
Min
Typ
Max
Unit
RESET
V
IH
2.7
-
-
V
V
IL
-
-
0.6
V
T
pull down
0.3
105
-
mS
The reset scenarios are illustrated in the following figures.
RESET
V
IL
<0.6V
VDD_EXT
STATUS
t>105ms
2.7s
t<400us
V
IH
>2.4V
Figure 15: Reset timing sequence
4.3.
Power Saving Mode
SIM800 has two power saving modes: Minimum function mode and sleep mode. The AT command
“AT+CSCLK=1”can be used to set SIM800 into sleep mode. The AT command “AT+CFUN=<fun>” can be used
to set SIM800 into minimum function. When SIM800 is in sleep mode and minimum function mode, the current
of module is the lowest.
4.3.1.
Function Mode
There are three function modes, which could be set by the AT command “AT+CFUN=<fun>”. The command
provides the choice of the function levels <fun>=0, 1, 4.
AT+CFUN=0: Minimum function.
AT+CFUN=1: Full function (default).
AT+CFUN=4: Flight mode (disable RF function).
Table 7: The current consumption of function modes (BS-PA-MFRMS=5)
<Fun>
Current consumption(mA) (CSCLK=1)
0
0.8
1
1.3
4
0.8
Minimum function mode minimizes the current consumption to the lowest level. If SIM800 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 all AT commands correlative with RF function and SIM card function will not
