User's Manual

Smart Machine Smart Decision
SIM7020G_User Manual_V1.00 25 2019-01-15
Table 11: Power off timing and electronic characteristic
Symbol
Parameter
Time value
Unit
Min.
Typ.
Max.
T
off
The active low level time pulse on PWRKEY pin to power
off module
0.8
1
-
s
T
off(status)
The time from power-off issue to STATUS pin output low
level(indicating power off )*
-
-
0.55
s
T
off(uart)
The time from power-off issue to UART port off
-
-
1
s
T
off(usb)
The time from power-off issue to USB port off
-
-
1
s
T
off-on
The buffer time from power-off issue to power-on issue
5
-
-
s
*Note: The STATUS pin can be used to detect whether module is powered on or not. When module
has been powered on and firmware goes ready, STATUS will be high level, or else STATUS will
still low level.
3.4.3 Reset Function
SIM7020G can be reset by pulling the RESET pin to ground.
Note: This function is only used as an emergency reset. The RESET pin will be ineffectiveness in
the power off mode.
The RESET pin has been pulled up to VBAT with a 40KΩ resistor internally. So it does not need to
be pulled up externally. It is strongly recommended to put a100nF capacitor and an ESD protection
diode close to the RESET pin. Please refer to the following figure for the recommended reference
circuit.
4.7K
47K
RESET
Reset
Logic
40K
VBAT
Module
1KΩ
100nF
T
reset
Figure 11: Reference reset circuit