LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 32 / 94
Switching on the power switch to supply power to USB_VBUS will wake up the module.
Please pay attention to the level match shown in dotted line between the module and the host. Refer to
document [1]
for more details about EC21 power management application.
3.5.2. Airplane Mode
When the module enters into airplane mode, the RF function does not work, and all AT commands
correlative with RF function will be inaccessible. This mode can be set via the following ways.
Hardware:
The W_DISABLE# pin is pulled up by default; driving it to low level will let the module enter into airplane
mode.
Software:
AT+CFUN
command provides the choice of the functionality level.
AT+CFUN=0:
Minimum functionality mode; both USIM and RF functions are disabled.
AT+CFUN=1:
Full functionality mode (by default).
AT+CFUN=4:
Airplane mode. RF function is disabled.
1. The W_DISABLE# control function is disabled in firmware by default. It can be enabled by
AT+QCFG=“airplanecontrol”
command. This command is under development.
2. The execution of
AT+CFUN
command will not affect GNSS function.
3.6. Power Supply
3.6.1. Power Supply Pins
EC21 provides four VBAT pins for connection with the external power supply. There are two separate
voltage domains for VBAT.
Two VBAT_RF pins for module RF part.
Two VBAT_BB pins for module baseband part.
The following table shows the details of VBAT pins and ground pins.
NOTES
NOTE
Quectel
Confidential
