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The typical value of RESET pin at High level is 1.8V, so for the 1.8V, customer could use MCU’s GPIO to drive
this pin directly, cascading some resistors could enhance the ESD performance but the value should not be too
big; otherwise the level of RESET could be lower than the threshold value; for RESET hardware parameters user
can refer to the table below:
Table 5: Electronic characteristic of the RESET pin
Pin name
Symbol
Min
Typ
Max
Unit
V
IH
1.5
V
V
IL
0.6
V
RESET
T
VL
105
ms
The reset scenarios are illustrated in the following figure.
Figure 13: Reset timing sequence
4.3.
Power Saving Mode
SIM2000S has two power saving modes: Minimum functionality mode and sleep mode. AT command
“AT+CSCLK=1”can be used to set SIM2000S into sleep mode. AT command “AT+CFUN=<fun>“can be used to
set SIM2000S into minimum functionality. When SIM2000S is in sleep mode and minimum functionality mode,
the current of the 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.
z
AT+CFUN=0
：
Minimum functionality.
z
AT+CFUN=1
：
Full functionality (default).
z
AT+CFUN=4
：
Flight mode (disable RF function).
Table 6: The current consumption of Minimum Functionality Mode
SIM2000S_Hardware_Design_V1.00
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2014-02-27
