Telit Wireless Solutions LN920 Guida

LN920

HW Design Guide

1VV0301730 Rev. 1 –2021-08-11

Telit Technical Documentation

LN920 HW Design Guide

1VV0301730 Rev. 1 Page 2of 81 2021-08-11

Not Subject to NDA

APPLICABILITY TABLE

PRODUCTS

PART NUMBER

LN920A12-WW

LN920A12xxx

LN920A6-WW

LN920A6xxx

 
 LN920 HW Design Guide 
 
 
 
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CONTENTS 
APPLICABILITY TABLE 2 
CONTENTS 3 
1. INTRODUCTION 8 
 Scope 8 
 Audience 8 
 Contact Information, Support 8 
 Symbol Conventions 10 
 Related Documents 10 
2. GENERAL PRODUCT DESCRIPTION 11 
 Overview 11 
 Product Variants and Frequency Bands 11 
 Main Features 11 
2.3.1. Configuration Pins 12 
 Block Diagram 14 
 Transmit Output Power 14 
 RX Sensitivity 14 
 Supported Carrier Aggregation combinations 18 
2.7.1. Two Carrier Aggregation combinations (LN920A6-WW + 
LN920A12-WW) 18 
2.7.2. Three Carrier Aggregation combinations (LN920A12-WW) 18 
 Mechanical Specifications 20 
2.8.1. Dimensions 20 
2.8.2. Weight 20 
 Environmental Requirements 20 
2.9.1. Temperature Range 20 
2.9.2. RoHS Compliance 21 
3. PINS ALLOCATION 22 
 Pin-out 22 
 LN920 Signals for debugging purposes 26 
 Pin Layout 27 

 
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4. POWER SUPPLY 28 
 Power Supply Requirements 28 
 Power Consumption 28 
4.2.1. Idle Mode 29 
4.2.2. LN920 Connected Mode Current Consumption 29 
 General Design Rules 30 
4.3.1. Electrical Design Guidelines 30 
4.3.1.1. +5V Source Power Supply Design Guidelines 30 
4.3.2. Thermal Design Guidelines 31 
4.3.3. Power Supply PCB Layout Guidelines 32 
 RTC (Real Time Clock) 33 
5. ELECTRICAL SPECIFICATIONS 34 
 Absolute Maximum Ratings –Not Optional 34 
 Recommended Operating Conditions 34 
6. DIGITAL SECTION 35 
 Logic Levels 36 
 Power On 37 
6.2.1. Initialization and Activation State 37 
 Power Off 38 
6.3.1. Graceful Shutdown 39 
6.3.2. Fast Shutdown 39 
 RESET 41 
6.4.1. Unconditional Hardware Reset 41 
 Communication Ports 42 
6.5.1. USB Interface 42 
6.5.2. SIM Interface 44 
6.5.2.1. SIM Schematic Example 45 
6.5.3. Control Signals 45 
6.5.4. General Purpose I/O 46 
6.5.4.1. Using a GPIO as INPUT 47 
6.5.4.2. Using a GPIO as OUTPUT 47 
 I2C –Inter-integrated circuit 48 

 
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7. RF SECTION 49 
 Bands Variants 49 
 TX Output Power 49 
 RX Sensitivity 49 
 Antenna Requirements 50 
7.4.1. Antenna Configration 51 
7.4.2. Antenna Connector 53 
7.4.2.1. Antenna Cable 54 
7.4.2.2. Antenna Installation Guidelines 54 
8. GNSS SECTION 56 
 GNSS Signals Pin-out 56 
 RF Front End Design 56 
8.2.1. Guidelines of PCB Line for GNSS Antenna 56 
8.2.2. Hardware-Based Solution for GNSS and LTE Coexistence 57 
 GNSS Antenna Requirements 58 
8.3.1. GNSS Antenna Specifications 58 
8.3.2. GNSS Antenna –Installation Guidelines 58 
 GNSS Characteristics 58 
9. MECHANICAL DESIGN 60 
 General 60 
 Drawing 60 
10. APPLICATION GUIDE 61 
 Debug of the LN920 Module in Production 61 
 Bypass Capacitor on Power Supplies 61 
 EMC Recommendations 62 
11. PACKAGING 63 
 Tray 63 
12. CONFORMITY ASSESTMENT 65 
 Approvals Summary 65 
 RED Approval 65 
12.2.1. RED Declaration of Conformity 65 

 
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12.2.2. Antennas 65 
 FCC and ISED Approval/
FCC et ISDE Approbation
 66 
12.3.1. FCC Certificate 66 
12.3.2. ISED Approval/
ISDE Approbation
 66 
12.3.3. Applicable FCC and ISED Rules /
Liste des Règles FCC et 
ISDE Applicables
 66 
12.3.4. FCC and ISED Regulatory Notices/
Avis Réglementaires de 
FCC et ISDE
 66 
12.3.5. Antennas 
/ 
Antennes 68 
12.3.6. FCC Label and Compliance Information 70 
12.3.7. ISED Label and Compliance Information/
ISED
 
Étiquette et 
Informations de Conformité
 70 
12.3.8. Information on Test Modes and Additional Testing 
Requirements / 
Informations sur les Modes de Test et les 
Exigences de Test Supplémentaires
 71 
12.3.9. Fcc Additional Testing, Part 15 Subpart B Disclaimer 72 
 ANATEL Regulatory Notices 72 
 RoHS and REACH Info 72 
12.5.1. RoHS Info 72 
12.5.2. REACH Info 72 
13. REFERENCE TABLE OF RF BANDS CHARACTERISTICS 73 
14. PRODUCT AND SAFETY INFORMATION 75 
 Copyrights and Other Notices 75 
14.1.1. Copyrights 75 
14.1.2. Computer Software Copyrights 75 
 Usage and Disclosure Restrictions 76 
14.2.1. License Agreements 76 
14.2.2. Copyrighted Materials 76 
14.2.3. High Risk Materials 76 
14.2.4. Trademarks 77 
14.2.5. 3rd Party Rights 77 
14.2.6. Waiwer of Liability 77 
 Safety Recommendations 78 

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15. GLOSSARY 79

16. DOCUMENT HISTORY 80

LN920 HW Design Guide

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1. INTRODUCTION

Scope

This document introduces the Telit LN920 module and presents possible and

recommended hardware solutions for the development of a product based on this

module. Features and solutions described in this document are applicable to all LN920

variants listed in the applicability table.

Where the suggested hardware configurations are not to be considered mandatory, the

information provided should be used as a guide and starting point for development of a

product based on a Telit LN920 module.

If a specific feature is applicable to a specific product only, it will be clearly marked.

Note: LN920 refers to all modules listed in the Applicability Table.

Audience

This document is intended for Telit customers, especially system integrators, about to

implement their applications using the Telit LN920 module.

Contact Information, Support

For general contact, technical support services, technical questions and report of

documentation errors contact Telit Technical Support at:

•

•

•

•

•

TS-ONEEDGE@telit.com

Alternatively, use:

https://www.telit.com/support

For detailed information about where you can buy the Telit modules or for

recommendations on accessories and components visit:

https://www.telit.com

LN920 HW Design Guide

1VV0301730 Rev. 1 Page 9of 81 2021-08-11

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Our aim is to make this guide as helpful as possible. Keep us informed of your comments

and suggestions for improvements.

Telit appreciates the user feedback on our information.

LN920 HW Design Guide

1VV0301730 Rev. 1 Page 10 of 81 2021-08-11

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Symbol Conventions

Danger: This information MUST be followed or catastrophic

equipment failure or personal injury may occur.

Warning: Alerts the user on important steps about the module

integration.

Note/Tip: Provides advice and suggestions that may be useful when

integrating the module.

Electro-static Discharge: Notifies the user to take proper grounding

precautions before handling the product.

Table 1: Symbol Conventions

All dates are in ISO 8601 format, that is YYYY-MM-DD.

Related Documents

•LN920 SW User Guide, TBD

•LN920 AT Commands Reference Guide, TBD

•LN920 Interface Board HW User Guide, TBD

•Generic EVB HW User Guide, 1VV0301249

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