User's Manual

Smart Machine Smart Decision
SIM7500A_User Manual_V1.022016-09-29
20
STATUS
(Output)
T
on
VBAT
PWRKEY
(Input)
T
on(status)
UART Port
Undefined
Active
T
on(uart)
Undefined
Active
USB Port T
on(usb)
Figure 9: Power on timing sequence
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
100
500
-
ms
T
on(status)
The time from power-on issue to STATUS pin
output high level(indicating power up ready )
22
-
-
s
T
on(uart)
The time from power-on issue to UART port ready
20
s
T
on(usb)
The time from power-on issue to USB port ready
20
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.