User's Manual

LTE Module
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 31 / 83
The turn on scenarios is illustrated as the following figure.
V
IL
≤ 0.5V
V
IH
≥ 1.3V
VBAT
PWRKEY
≥ 100ms
RESET_N
STATUS
(OD)
≤ 0.5s
≥ 7.5s
Inactive
Active
UART
NOTE
Inactive
Active
USB
≥ 9s
Figure 12: Timing of Turning on Module
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is no less than
30ms.
3.7.2. Turn off Module
The following procedures can be used to turn off the module:
 Normal power down procedure: Turn off the module using the PWRKEY pin.
 Normal power down procedure: Turn off the module using command AT+QPOWD.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY to a low level voltage for at least 0.6s, the module will execute power-down
procedure after PWRKEY is released. The power-down scenario is illustrated as the following figure.
NOTE