EC21 SeriesHardware DesignLTE Standard Module SeriesVersion: 1.9Date: 2021-08-17Status: Released

Quectel EC21 Series Hardware Design

About the Document

Introduction

Supported Character Sets

Turn off Procedure

General Commands

AT+GMI Request Manufacturer Identification

AT+GMR Request TA Revision Identification of Software Release

AT+CGMM Request Model Identification

AT+GSN Request International Mobile Equipment Identity (IMEI)

AT+CGSN Request Product Serial Number Identification

AT&V Display Current Configuration

AT&W Store Current Parameters to User Defined Profile

ATQ Set Result Code Presentation Mode

TABLE 3: ATV0&ATV1 RESULT CODES NUMERIC EQUIVALENTS AND BRIEF DESCRIPTION

ATE Set Command Echo Mode

ATS3 Set Command Line Termination Character

ATS4 Set Response Formatting Character

ATX Set CONNECT Result Code Format and Monitor Call Progress

AT+CFUN Set Phone Functionality

AT+CMEE Error Message Format

AT+CSCS Select TE Character Set

AT+QURCCFG Configure URC Indication Option

Serial Interface Control Commands

AT+IFC Set TE-TA Local Data Flow Control

AT+ICF Set TE-TA Control Character Framing

AT+IPR Set TE-TA Fixed Local Rate

AT+QRIR Restore RI Behavior to Inactive

Status Control Commands

AT+CEER Extended Error Report

AT+QCFG Extended Configuration Settings

AT+QCFG="gprsattach" GPRS Attach Mode Configuration

AT+QCFG="nwscanmode" Network Search Mode Configuration

AT+QCFG="nwscanseq" Network Searching Sequence Configuration

AT+QCFG="roamservice" Roam Service Configuration

AT+QCFG="band" Band Configuration

AT+QCFG="hsdpacat" HSDPA Category Configuration

AT+QCFG="rrc" RRC Release Version Configuration

AT+QCFG="sgsn" UE SGSN Release Version Configuration

AT+QCFG="PDP/duplicatechk" Establish Multi PDNs with the Same APN

AT+QCFG="urc/ri/ring" RI Behavior When RING URC is Presented

AT+QCFG="urc/ri/smsincoming" RI Behavior When Incoming SMS URCs are Presented

AT+QCFG="urc/ri/other" RI Behavior When Other URCs are Presented

AT+QCFG="urc/delay" Delay URC Indication

AT+QCFG="urc/cache" URC Cache Function

AT+QCFG="tone/incoming" Ring tone Function

AT+QINDCFG URC Indication Configuration

U)SIM Related Commands

AT+CLCK Facility Lock

AT+CPIN Enter PIN

AT+CPWD Change Password

AT+CSIM Generic (U)SIM Access

AT+CRSM Restricted (U)SIM Access

AT+QCCID Show ICCID

AT+QPINC Display PIN Remainder Counter

AT+QINISTAT Query Initialization Status of (U)SIM Card

AT+QSIMSTAT (U)SIM Card Insertion Status Report

Network Service Commands

AT+CREG Network Registration

AT+CSQ Signal Quality Report

AT+CPOL Preferred Operator List

AT+COPN Read Operator Names

AT+CTZR Time Zone Reporting

AT+QLTS Obtain the Latest Time Synchronized Through Network

AT+QNWINFO Query Network Information

AT+QSPN Display the Name of Registered Network

Call Related Commands

ATD Mobile Originated Call to Dial a Number

ATH Disconnect Existing Connection

AT+CHUP Hang up Call

ATO Switch from Command Mode to Data Mode

ATS0 Set Number of Rings before Automatically Answering Call

ATS6 Set Pause before Blind Dialing

ATS8 Set the Time to Wait for Comma Dial Modifier

ATS10 Set Disconnection Delay after Indicating the Absence of Data Carrier

TABLE 4: PARAMETER CONFIGURATIONS SUPPORTED BY AT+CBST

AT+CSTA Select Type of Address

AT+CR Service Reporting Control

AT+CRC Set Cellular Result Codes for Incoming Call Indication

AT+CRLP Select Radio Link Protocol Parameter

AT+QECCNUM Configure Emergency Call Numbers

AT+QHUP Hang up Call with a Specific Release Cause

Phonebook Commands

AT+CPBF Find Phonebook Entries

AT+CPBR Read Phonebook Entries

AT+CPBS Select Phonebook Memory Storage

AT+CPBW Write Phonebook Entry

Short Message Service Commands

AT+CMGF Message Format

AT+CSCA Service Center Address

AT+CPMS Preferred Message Storage

AT+CMGD Delete Message

AT+CMGL List Messages

AT+CMGR Read Message

AT+CMGS Send Message

EC21 Series

Updated function diagram in Figure

4. Added BT interface in Chapter 3.18.2

Safety Information

Product Concept

Key Features

Functional Diagram

Application Interfaces

Pin Assignment

Pin Description

Operating Modes

USB Application with USB Remote Wakeup Function

USB Application with USB Suspend/Resume and RI Function

USB Application without USB Suspend Function

Airplane Mode

Decrease Voltage Drop

Reference Design for Power Supply

Monitor the Power Supply

FIGURE 11: TURN ON THE MODULE USING KEYSTROKE

Turn off Module

Reset the Module

USIM Card Interface

FIGURE 17: REFERENCE CIRCUIT OF USIM CARD INTERFACE WITH AN 8-PIN USIM CARD CONNECTOR

USB Interface

FIGURE 19: REFERENCE CIRCUIT OF USB APPLICATION

UART Interfaces

TABLE 13: LOGIC LEVELS OF DIGITAL I/O

PCM and I2C Interfaces

TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACES

FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC

ADC Function

Network Status Indication

STATUS

Behavior of the RI

TABLE 21: PIN DEFINITION OF THE SGMII INTERFACE

FIGURE 28: REFERENCE CIRCUIT OF SGMII INTERFACE WITH PHY AR8033 APPLICATION

Wireless Connectivity Interfaces

FIGURE 29: REFERENCE CIRCUIT OF WIRELESS CONNECTIVITY INTERFACES WITH FC20 MODULE

WLAN Interface

USB_BOOT Interface

GNSS Receiver

Layout Guidelines

Antenna Interfaces

Reference Design of RF Antenna Interface

Reference Design of RF Layout

FIGURE 34: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND)

GNSS Antenna Interface

Antenna Installation

Recommended RF Connector for Antenna Installation

FIGURE 39: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM)

Electrical, Reliability and Radio Characteristics

Operating Temperature

Current Consumption

TABLE 34: EC21-AUT CURRENT CONSUMPTION

TABLE 35: EC21-E CURRENT CONSUMPTION

TABLE 36: EC21-KL CURRENT CONSUMPTION

TABLE 37: EC21-V CURRENT CONSUMPTION

TABLE 39: GNSS CURRENT CONSUMPTION OF EC21 SERIES MODULE

RF Output Power

TABLE 42: EC21-A CONDUCTED RF RECEIVING SENSITIVITY

TABLE 45: EC21-AUTL CONDUCTED RF RECEIVING SENSITIVITY

TABLE 48: EC21-J CONDUCTED RF RECEIVING SENSITIVITY

Electrostatic Discharge

Mechanical Dimensions

FIGURE 41: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW)

Recommended Footprint

Design Effect Drawings of the Module

Storage, Manufacturing and Packaging

Manufacturing and Soldering

Packaging

Appendix A References

Appendix B GPRS Coding Schemes

Appendix C GPRS Multi-slot Classes

Appendix D EDGE Modulation and Coding Schemes

EC21-A

EC21-AU

EC21-AUT

EC21-AUX Mini PCIe Series

EC21-E

EC21-EU Mini PCIe Series

EC21-EUX

EC21-J

EC21-KL

EC21-V