Quectel EG21-G Guide

EG21-G

Reference Design

LTE Standard Module Series

Rev. EG21-G_Reference_Design_V1.0

Date: 2019-12-05

Status: Released

www.quectel.com

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 1 / 8

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LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 2 / 8

About the Document

Revision History

Revision

Date

Author

Description

1.0

2019-12-05

Lim PENG/

Woody WU

Initial

 LTE Standard Module Series 
 EG21-G Reference Design 
 
EG21-G_Reference_Design  3 / 8
 
 
 
Contents 
About the Document...................................................................................................................................2 
Contents.......................................................................................................................................................3 
Figure Index.................................................................................................................................................4 
1Reference Design.................................................................................................................................5 
1.1. Introduction ................................................................................................................................5
1.2. Power-on/off and Resetting Scenarios......................................................................................6
1.2.1. Power-on Scenario...........................................................................................................6
1.2.2. Power-off Scenario...........................................................................................................7
1.2.3. Resetting Scenario...........................................................................................................8
1.3. Schematics ................................................................................................................................8

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 4 / 8

Figure Index

FIGURE 1: TIMING OF TURNING ON MODULE ............................................................................................... 6

FIGURE 2: TIMING OF TURNING OFF MODULE ............................................................................................. 7

FIGURE 3: TIMING OF RESETTING MODULE ................................................................................................. 8

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 5 / 8

1Reference Design

1.1. Introduction

This document provides the reference design for Quectel EG21-G module. And the reference design

includes power-on/off/resetting scenarios, block diagrams of power supply and module design, UART

interfaces, (U)SIM interface, audio interfaces, etc.

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 6 / 8

1.2. Power-on/off and Resetting Scenarios

1.2.1. Power-on Scenario

VIL≤0.5V

VH=0.8V

VBAT

PWRKEY

≥500ms

RESET_N

STATUS

(OD)

Inactive Active

UART

NOTE 1

Inactive Active

USB

≥2.5s

≥12s

≥13s

VDD_EXT

About 100ms

BOOT_CONFIG &

USB_BOOT Pins

≥100ms. After this time, the BOOT_CONFIG

pins can be set to high level by external circuit.

Figure 1: Timing of Turning on Module

1. Please make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is

no less than 30ms.

2. When using MCU to control module to enter the emergency download mode, please follow the above

timing sequence. It is not recommended to pull up USB_BOOT to 1.8V before powering up VBAT.

Short the test points as shown in Figure 28 can manually force the module to enter download mode.

NOTES

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 7 / 8

1.2.2. Power-off Scenario

VBAT

PWRKEY

≥29.5s

≥650ms

RUNNING Power-down procedure OFF

Module

Status

STATUS

(OD)

Figure 2: Timing of Turning off Module

1. In order to avoid damaging internal flash, please do not switch off the power supply when the module

works normally. Only after the module is shut down by PWRKEY or AT command, the power supply

can be cut off.

2. When turning off module with the AT command, please keep PWRKEY at a high level after the

execution of the command. Otherwise, the module will turn itself back on after being shut down.

NOTES

LTE Standard Module Series

EG21-G Reference Design

EG21-G_Reference_Design 8 / 8

1.2.3. Resetting Scenario

VIL≤0.5V VIH≥1.3V

VBAT

≥150ms

Resetting

Module

Status Running

RESET_N

Restart

≤460ms

Figure 3: Timing of Resetting Module

1. Please ensure that there is no large capacitance with the max value exceeding 10nF on PWRKEY

and RESET_N pins.

2. RESET_N only resets the internal baseband chip of the module and does not reset the power

management chip.

3. It is recommended to use RESET_N only when failing to turn off the module by AT+QPOWD

command or PWRKEY pin.

1.3. Schematics

The schematics illustrated in the following pages are provided for your reference only.

NOTES

EG21-G Reference Design

2019/12/5

DATE

1.0

114

VER

TITLE

SIZE

PROJECT

Quectel Wireless Solutions

6543 21

SHEET

DRAWN BY

CHECKED BY

Woody WU

Lorry XU

Power Supply Block Diagram

DC-DC

DC 5V OUT

e.g. DC 12V IN DC 3.8V @2.0A

EG21-G

MIC29302WU

MOS ON/OFF USB_VBUS

VBAT_EN

SGM2019-ADJYN5G/TR DC 3.3V

SGM2019-ADJYN5G/TR DC 1.8V

CODEC_

VDD_EXT

MIC29302WU

ALC5616

TLV320AIC3104

Codec

VBUS_CTRL EN

POWER_EN

SD card

MOS ON/OFF

DC 3.3V @0.8A

SD_PWR_EN

SGMII

DC 3.3V @0.8A

51K

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