Product Info

LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 35 / 100
Figure 11: Turn on the Module by Using Keystroke
The power-on scenario is illustrated in the following figure.
V
IL
≤0.5V
V
IH
≥1.3V
VBAT
PWRKEY
≥500ms
RESET_N
STATUS
(OD)
Inactive
Active
UART
NOTE
Inactive
Active
USB
≥2.5s
≥12s
≥13s
VDD_EXT
About 100ms
BOOT_CONFIG &
USB_BOOT
≥100ms. Ater this time, the BOOT_CONFIG
pin can be set high level by external circuit.
Figure 12: Power-on Scenario of Module
Please make sure that VBAT is stable before pulling down PWRKEY pin. The time between them should
be 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 AT+QPOWD command.
NOTE