Shanghai SIMCom Wireless Solutions Limited SIM7000G ユーザーズマニュアル
Smart Machine Smart Decision
SIM7000 _Hardware Design _V1.00
2017-05-23
Table 8: Power on timing and electronic characteristic
Symbol
Parameter
Min.
Typ.
Max. Unit
T
on
The time of active low level impulse of PWRKEY
pin to power on module
pin to power on module
72
-
-
ms
T
on(status)
The time from power-on issue to STATUS pin
output high level(indicating power up ready )
output high level(indicating power up ready )
4.2
-
-
s
T
on(uart)
The time from power-on issue to UART port ready 3.5
-
-
s
T
on(usb)
The time from power-on issue to USB port ready
3.5
-
-
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 SIM7000.
●
Method 1: Power off SIM7000 by pulling the PWRKEY pin to ground.
●
Method 2: Power off SIM7000 by AT command
“
AT+CPOWD
”.
●
Method 3: over-voltage or under-voltage automatic power off. The voltage range can be set by
AT command “AT+CBATCHK”.
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.
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.
Figure 11: Power off timing sequence