User's Manual

Smart Machine Smart Decision
SIM7600E-H_User Manual_V1.00 2017-10-11
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 )
12 13 -
s
T
on(uart)
The time from power-on issue to UART port ready 11 12 - 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 SIM7600E-H.
● Method 1: Power off SIM7600E-H by pulling the PWRKEY pin down to ground.
● Method 2: Power off SIM7600E-H 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 ℃ , SIM7600E-H will be powered off
automatically.
For details about “AT+CPOF” and “AT+CPMVT”, 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.
(
Output
)
T
off
( Input
)
T
off(status)
UART Port
UndefinedActive
T
off(uart)
T
on
T
off-on
USB Port
Undefined
Active
T
off(usb)
PWRKEY
STATUS
Figure 11: Power off timing sequence