Service Guide

LTE Standard Module Series

EG91_Series_Hardware_Design

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Table 5: Overview of Operating Modes

For details of the above AT command, see document [3].

3.5. Power Saving

3.5.1. Sleep Mode

EG91 series module is able to reduce its current consumption to a minimum value during the sleep mode.

The following sub-chapters describe the power saving procedures of EG91 series module.

3.5.1.1. UART Application

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

module enter sleep mode.

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

 Drive DTR to high level.

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

Mode Details

Normal

Operation

Idle

Software is active. The module has registered on network, and it is

ready to send and receive data.

Talk/Data

Network is connected. In this mode, the power consumption is decided

by network setting and data transfer rate.

Airplane

Mode

AT+CFUN=4 or W_DISABLE# pin can set the module to enter airplane mode. In this

case, RF function will be invalid.

Minimum

Functionality

Mode

AT+CFUN=0 can set the module to a minimum functionality mode without removing the

power supply. In this case, both RF function and (U)SIM card 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

goes inactive. The serial interface is not accessible. Operating voltage (connected to

VBAT_RF and VBAT_BB) remains applied.