LTE Standard Module Series
EC200T Series Hardware Design
EC200T_Series_Hardware_Design 37 / 90
The timing of turning on the module is illustrated in the following figure.
V
IL
≤
0.5 V
VBAT
PWRKEY
≥
500 ms
RESET_N
STATUS
(OD)
Inactive
ActiveUART
NOTE 1
Inactive ActiveUSB
≥ 10 s
VDD_EXT
FORCE_USB_BOOT
≥ 100 ms. After this time, the pin can be set
high level by an external circuit.
About 22 ms
About 5 ms
≥ 10 s
≥ 10 s
Figure 11: Timing of Turning on Module
1. Please make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
no less than 30 ms.
2. PWRKEY can be pulled down directly to GND with a recommended 4.7 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:
Using the PWRKEY pin.
Using AT+QPOWD command.
NOTES
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