Sunsea AIoT SimCom SIM7090G User Manual page 27

Table 8: Power off timing and electronic characteristic
Symbol Parameter
The active low level time pulse on PWRKEY
T
off
pin to power off module
The time from power-off issue to VDD_EXT pin
T
off(vdd)
output low level
The time from power-off issue to STATUS pin
T
off(status)
output low 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)
The buffer time from power-off issue to
T
off-on
power-on issue
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 the Module
RESET_N is used to reset the module. The module can be reset by driving RESET_N to a low level voltage
for a period of time.
The RESET pin has been pulled up to 1.8V with a resistor internally. So it does not need to be pulled up
externally. It is strongly recommended to put an ESD protection diode close to the RESET pin. Please refer
to the following figure for the recommended reference circuit.
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SIM7090G User Manual V1.01
Time value
Min. Typ. Max.
1.2 -
1.8 -
1.8 -
1.8 -
1.8 -
2 -
Unit
- s
- s
- s
- s
- s
- s
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