Power Saving Mode - SimCom SIM800L Hardware Design

only when AT command "AT+CPOWD=1" and the PWRKEY pin has no effect. Customer can pull the RESET
pin to ground, then the module will reset.
This pin is already isolated in the module, so the external isolation is not necessary. Following figure is internal
circuit of the RESET pin.
The typical value of RESET pin at High level is 1.8V, RESET hardware parameters can refer to the table below:
Table 7: Electronic characteristic of the RESET pin
Pin name
RESET
The reset scenarios are illustrated in the following figures.
RESET
VDD_EXT
STATUS

4.3. Power Saving Mode

SIM800L has two power saving modes: Minimum functionality mode and sleep mode. AT command
"AT+CSCLK=1"can be used to set SIM800L into sleep mode. AT command "AT+CFUN=<fun>" can be used to
set SIM800L into minimum functionality. When SIM800L is in sleep mode and minimum functionality mode,
the current of module is lowest.
SIM800L(MT6261)_Hardware Design_V1.01
Figure 15: Reset circuit
Symbol Min
V 1.5
IH
V -
IL
Low power time 105
T>105ms
V <0.6V
IL
t=400us
Figure 16: Reset timing sequence
RESET
Circuit
4.7K
47K
RESET
Module
Typ
1.8
-
VDD_EXT=2.8V
t=2.7S
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1.8 V
Max Unit
2.0 V
0.6 V
- ms
2016-07-07