User's Manual

SIM7600SA-H_User Manual_V1.00
2017-10-11
Smart Machine Smart Decision
Table 9: Power off timing and electronic characteristic
Symbol
Parameter
Time valu
e
Unit
Min.
Typ.
Max.
T
off
The active low level time pulse on PWRKEY pin to
power off module
2.5
--
--
s
T
off(status)
The time from power-off issue to STATUS pin output low
level(indicating power off )*
25
26
-
s
T
off(uart)
The time from power-off issue to UART port off
14
15
-
s
T
off(usb)
The time from power-off issue to USB port off
27
28
-
s
T
off-on
The buffer time from power-off issue to power-on issue
0
-
-
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.
3.2.3 Reset Function
SIM7600SA-H can be reset by pulling the RESET pin down to ground.
Note: This function is only used as an emergency reset, when AT command “AT+CPOF” and
the PWRKEY pin all have lost efficacy.
The RESET pin has been pulled up with a 40KΩ resistor to 1.8V 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.
Reset
Logic
1.8V
T
reset
40K
Reset Impulse
RESET
100 Ω
4.7K
100nF
47K
MODULE
Figure 12: Reference reset circuit