Reset Function - Sunsea AIoT SIMCom SIM7600NA User Manual

PWRKEY
( Input )
STATUS
( Output )
UART Port
USB Port
Table 9: Power off timing and electronic characteristic
Symbol Parameter
The active low level time pulse on PWRKEY pin to
T
off
power off MODULE
The time from power-off issue to STATUS pin output low
T
off(status)
level(indicating power off )*
T The time from power-off issue to UART port off
off(uart)
T The time from power-off issue to USB port off
off(usb)
T The buffer time from power-off issue to power-on issue
off-on
*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

MODULE 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.
SIM7600NA_user manual _V1.00
T
off
T
off(status)
T
off(uart)
Active
T
off(usb)
Active
Figure 11: Power off timing sequence
28
Smart Machine Smart Decision
T
off-on
T
on
Undefined
Undefined
Time value
Min. Typ.
-- 2.5
25 26
14 15
27 28
0 -
2020-1-7
Unit
Max.
-- s
- s
- s
- s
- s