Product Info

LTE Standard Module Series

EC21 Hardware Design

EC21_Hardware_Design 38 / 120

PCM interface pins are multiplexing pins used for audio design on EC25 module and BT function on

FC20 module.

1. SD card, wireless connectivity and SGMII interfaces pins are not supported on ThreadX module.

2. BT function is under development.

3.4. Operating Modes

The table below briefly summarizes the various operating modes referred in the following chapters.

Table 5: Overview of Operating Modes

Mode Details

Normal

Operation

Idle

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

ready to send and receive data.

Talk/Data

Network connection is ongoing. In this mode, the power consumption is

decided by network setting and data transfer rate.

Minimum

Functionality

Mode

AT+CFUN command 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.

Airplane

Mode

AT+CFUN command or W_DISABLE# pin can set the module to 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

EC21 is able to reduce its current consumption to a minimum value during the sleep mode. The following

section describes power saving procedures of EC21 module.

NOTES