LTE Standard Module Series
EG25-GL_Hardware_Design 37 / 96
1. Make sure that VBAT is stable before pulling down PWRKEY pin. It is recommended that the time
between powering up VBAT and pulling down PWRKEY pin is not less than 30 ms.
2. PWRKEY can be pulled down directly to GND with a recommended 10 k
Ω resistor if the module
needs to be turned on automatically and shutdown is not needed.
3. BOOT_CONFIG pins (WAKEUP_IN, NET_MODE, WLAN_EN, COEX_RXD, COEX_TXD,
USB_BOOT and BT_CTS
*
) cannot be pulled up before startup.
4. Ensure that there is no large capacitance on PWRKEY pin.
3.5 Turn Off
The following procedures can be used to turn off the module normally:
⚫
Use the PWRKEY pin.
⚫
Use
AT+QPOWD
command. For details of the command, see
document [2]
3.5.1 Turn Off with PWRKEY
Driving PWRKEY low for at least 650 ms, the module will execute power-off procedure after the PWRKEY
is released. The power-down timing is illustrated in the following figure.
VBAT
PWRKEY
29.5 s
650 ms
Running
Power-down procedure
OFF
Module
Status
STATUS
(OD)
Figure 13: Power-down Timing
3.5.2 Turn Off with AT Command
It is also a safe way to use
AT+QPOWD
to turn off the module, which is similar to turning off the module
via the PWRKEY pin.
NOTE