User's Manual

LTE Module

EC20 Hardware Design

EC20_Hardware_Design Confidential / Released 23 / 83

Functionality

Mode

without removing the power supply. In this case, both RF function and USIM card will be

invalid.

Airplane

Mode

AT+CFUN command and W_DISABLE# pin can set the module entering into airplane

mode. In this case, RF function will be invalid.

Sleep Mode

In this mode, the current consumption of the module will be reduced to the minimal level.

During this mode, the module can still receive paging message, SMS, voice call and

TCP/UDP data from the network normally.

Power Down

Mode

In this mode, the power management unit shuts down the power supply. Software is not

active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF

and VBAT_BB) remains applied.

3.5. Power Saving

3.5.1. Sleep Mode

EC20 is able to reduce its current consumption to a minimum value during the sleep mode. The following

section describes EC20’s power saving procedure.

3.5.1.1. UART Application

If host communicates with module via UART interface, the following preconditions can let the module

enter into the sleep mode.

 Execute AT command AT+QSCLK=1 to enable the sleep mode.

 Drive DTR to high level.

The following figure shows the connection between the module and host.

RXD

TXD

DTR

AP_READY

TXD

RXD

EINT

GPIO

Module

Host

GND

Figure 3: UART Sleep Application