Telit Wireless Solutions LM940 1.0 Mode d’emploi

LM940

Translation Board HW Design Guide

1VV0301384 Rev. 1 –2021-06-16

Telit Technical Documentation

LM940 TLB Hardware Design Guide

1VV0301384 Rev. 1 Page 2of 28 2021-06-16

Not Subject to NDA

APPLICABILITY TABLE

PRODUCTS

LM940, 1.0

LM940, 2.0

 
 LM940 TLB Hardware Design Guide 
 
 
 
1VV0301384 Rev. 1 Page 3of 28 2021-06-16 
Not Subject to NDA 
 
CONTENTS 
APPLICABILITY TABLE 2 
CONTENTS 3 
1. INTRODUCTION 5 
 Scope 5 
 Audience 5 
 Contact Information, Support 5 
 Symbol Conventions 6 
 Related Documents 6 
2. GENERAL PRODUCT DESCRIPTION 7 
 Overview 7 
 TLB View 8 
 Low Power Mode (LPM) 10 
 Antenna Ports 11 
 Evaluation Board Connections 13 
3. COMPONENT ASSEMBLY DIAGRAM 15 
 Searchable Layout 15 
4. SCHEMATICS 19 
5. PRODUCT AND SAFETY INFORMATION 22 
 Copyrights and Other Notices 22 
5.1.1. Copyrights 22 
5.1.2. Computer Software Copyrights 22 
 Usage and Disclosure Restrictions 23 
5.2.1. License Agreements 23 
5.2.2. Copyrighted Materials 23 
5.2.3. High Risk Materials 23 
5.2.4. Trademarks 23 
5.2.5. Third Party Rights 24 
5.2.6. Waiwer of Liability 24 
 Safety Recommendations 24 

LM940 TLB Hardware Design Guide

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6. GLOSSARY 26

7. DOCUMENT HISTORY 27

LM940 TLB Hardware Design Guide

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1. INTRODUCTION

Scope

This document describes the LM940 TLB which is part of complete LM940 Development Kit

(Dev-Kit).

Audience

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

implement their applications using the Telit LM940 module.

Contact Information, Support

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

documentation errors contact Telit Technical Support at:

•

•

•

•

•

Alternatively, use:

https://www.telit.com/contact-us/

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

recommendations on accessories and components visit:

https://www.telit.com

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.

LM940 TLB Hardware Design Guide

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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

•LM940 Hardware User Guide, 1VV301352

•Generic Evaluation Board Hardware User Guide, 1VV0301249

•LM940 SW User Guide, 1VV0301343

LM940 TLB Hardware Design Guide

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Not Subject to NDA

2. GENERAL PRODUCT DESCRIPTION

Overview

The Translation Board (TLB) is custom-designed to interface the Telit LM940 module with

the Telit Generic Evaluation Board (EVB), thus forming the complete LM940 Development

Kit.

The TLB maps Telit the signals and functions of the Telit module into generic EVB signals

and functions.

The LM940 TLB design includes the following items:

•LM940 socket

•RF SMA connectors

•Board to Board connectors for interfacing to EVB main board

•Module specific circuitry which is not part of the generic EVB circuitry

Power supply and control interface for the module is provided by the EVB through the

board-to-board (B2B) connectors.

To monitor the temperature, a thermistor is placed close to the module on the upper

ground plane: this in order to properly measure the temperature of the rear of the module.

Under the module, the bottom plane PCB solder-mask is cutout to optimally mount/attach

a heatsink aiming to cool the module.

The board is designed to accommodate modules according to the LM940 MINI PCIE (50.95

x 30.00 x 2.70mm, +/- 0.15 mm tolerance and 52 pins) updated pin mapping.

PCB reference numbers:

Board

PCB Code

EVB

CS1742E

TLB

CS1824A, CS1914B

Module

LM940 1.0, LM940 2.0 (CS1822x)

Table 2: PCB reference numbers

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TLB View

The below pictures show the TLB top and bottom view.

LM940 1.0 TLB Top View

Figure 1: LM940 1.0 TLB Top View

LM940 1.0 TLB Bottom View

Figure 2: LM940 1.0 TLB Bottom View

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LM940 2.0 TLB Top View

Figure 3: LM940 2.0 TLB Top View

LM940 2.0 TLB Bottom View

Figure 4: LM940 2.0 TLB Bottom View

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Low Power Mode (LPM)

Figure 5: Low Power Mode

This section contains how to switch to LPM mode by means of a header jumper.

Jumper Header

Description

2 –3: Low

LPM mode

W_DISABLE_N

The W_DISABLE_N signal is provided to trigger

the LM940 to switch to Low Power Mode (also

known as “Airplane Mode”).

Table 3: how to switch to LPM mode by means of a header jumper

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