Power Off - SimCom SIM7000G User Manual

Table 8: Power on timing and electronic characteristic
Symbol Parameter
The time of active low level impulse of PWRKEY
T
on
pin to power on module
The time from power-on issue to STATUS pin
T
on(status)
output high level(indicating power up ready )
T The time from power-on issue to UART port ready
on(uart)
T The time from power-on issue to USB port ready
on(usb)
V Input high level voltage on PWRKEY pin
IH
V Input low level voltage on PWRKEY pin
IL
3.2.2

Power off

The following methods can be used to power off SIM7000.
Method 1: Power off SIM7000 by pulling the PWRKEY pin to ground.
●
Method 2: Power off SIM7000 by AT command
●
Method 3: over-voltage or under-voltage automatic power off. The voltage range can be set by
●
AT command "AT+CBATCHK".
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 ℃ , SIM7000 will be powered off
automatically.
For details about "AT+CPOWD" and "AT+CBATCHK", please refer to Document [1].
These procedures will make modules 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.
SIM7000 _Hardware Design _V1.00
"
Figure 11: Power off timing sequence
Smart Machine Smart Decision
Min.
72
4.2
3.5
3.5
0.6
-0.3
AT+CPOWD
".
Typ. Max. Unit
- - ms
- - s
- - s
- - s
0.8 1.8 V
0 0.5 V
2017-05-23