Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 47 / 134
V
IL
0.5 V
V
H
=0.8 V
VBAT
PWRKEY
500 ms
RESET_N
STATUS
(OD)
Inactive
Active
UART
NOTE 1
Inactive
Active
USB
3 s
12 s
13 s
VDD_EXT
About 100 ms
BOOT_CONFIG &
USB_BOOT Pins
100 ms. Over this time, BOOT_CONFIG
pins can be pulled up externally.
Figure 12: Timing of Turning on Module
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 30 ms.
2. PWRKEY can be pulled down directly to GND with a recommended 10 kΩ 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 normally:
⚫ Use the PWRKEY pin.
⚫ Use AT+QPOWD command.
NOTES