Smart Machine Smart Decision
SIM7600NA_user manual _V1.00 27
2020-1-7
Table 8: Power on timing and electronic characteristic
Symbol
Parameter
Min.
Ty
p.
Max. Unit
T
on
The time of active low level impulse of PWRKEY
pin to power on MODULE
100
500 -
ms
T
on(status)
The time from power-on issue to STATUS pin output
high level(indicating power up ready )
15
16
-
s
T
on(uart)
The time from power-on issue to UART port ready
13
14
-
s
T
on(vdd_aux)
The time from power-on issue to VDD_AUX ready
2.5 -
s
T
on(usb)
The time from power-on issue to USB port ready
11
12
-
s
V
IH
Input high level voltage on PWRKEY pin
0.6
0.8 1.8
V
V
IL
Input low level voltage on PWRKEY pin
-0.3
0
0.5
V
3.2.2
Power off
The following methods can be used to power off MODULE.
●
Method 1: Power off MODULE by pulling the PWRKEY pin down to ground.
●
Method 2: Power off MODULE by AT command
“
AT+CPOF
”.
●
Method 3: over-voltage or under-voltage automatic power off. The voltage range can be set by
AT command
“
AT+CPMVT
”.
●
Method 4: over-temperature or under-temperature automatic power off.
Note: If the temperature is outside the range of -30~+80
℃
, some warning will be reported via AT
port. If the temperature is outside the range of -40~+85
℃
, MODULE will be powered off
automatically.
For details about “AT+CPOF” and “AT+CPMVT”, please refer to Document [1].
These procedures will make MODULE disconnect from the network and allow the software to
enter a safe state, and save data before MODULE be powered off completely.
The power off scenario by pulling down the PWRKEY pin is illustrated in the following figure.