Quectel EC25-AUX

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 45 / 130
1. Please 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 no less than 30ms.
2. PWRKEY can be pulled down directly to GND with a recommended 10KΩ resistor if module needs to
be powered on automatically and shutdown is not needed.
3.7.2. Turn off Module
The following procedures can be used to turn off the module:
 Normal power-off procedure: Turn off the module using the PWRKEY pin.
 Normal power-off procedure: Turn off the module using AT+QPOWD command.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY pin to a low level voltage for at least 650ms, the module will execute power-off
procedure after the PWRKEY is released. The power-off scenario is illustrated in the following figure.
VBAT
PWRKEY
≥29.5s ≥ 65 0m s
RUNNING
Po wer-down pro cedu re
OFF
Module
Status
STATUS
(OD)
Figure 13: Timing of Turning off Module
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT+QPOWD command to turn off the module, which is similar to turning off the
module via PWRKEY pin.
Please refer to document [2] for details about AT+QPOWD command.
NOTES