User's Manual

LTE Module
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 32 / 83
VBAT
PWRKEY
Log off network about 1s to 60s
≥ 0.6s
RUNNING
Power-down procedure
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 command AT+QPOWD to turn off the module, which is similar to turning off
the module via PWRKEY Pin.
Please refer to document [2] for details about the AT command of AT+QPOWD.
3.8. Reset the Module
The RESET_N can be used to reset the module. You can reset the module by driving the RESET_N to a
low level voltage for more than 150ms and then releasing it.
Table 8: RESET_N Pin Description
Pin Name
Pin No.
Description
DC Characteristics
Comment
RESET_N
20
Reset the module.
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
Pull-up to 1.8V internally.
Active low.
The recommended circuit is similar to the PWRKEY control circuit. You can use open drain/collector
driver or button to control the RESET_N.