Telit Communications S p A LM940 User Guide

LM940

HW Design Guide

1VV0301352 Rev. 2 –2017-07-19

[01.2017]

Mod.0818 2017-01 Rev.0

LM940 HW Design Guide

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

NOTICE

While reasonable efforts have been made to assure the accuracy of this document, Telit
assumes no liability resulting from any inaccuracies or omissions in this document, or from
use of the information obtained herein. The information in this document has been carefully
checked and is believed to be reliable. However, no responsibility is assumed for
inaccuracies or omissions. Telit reserves the right to make changes to any products
described herein and reserves the right to revise this document and to make changes from
time to time in content hereof with no obligation to notify any person of revisions or changes.
Telit does not assume any liability arising out of the application or use of any product,
software, or circuit described herein; neither does it convey license under its patent rights
or the rights of others.

It is possible that this publication may contain references to, or information about Telit
products (machines and programs), programming, or services that are not announced in
your country. Such references or information must not be construed to mean that Telit
intends to announce such Telit products, programming, or services in your country.

COPYRIGHTS

This instruction manual and the Telit products described in this instruction manual may be,
include or describe copyrighted Telit material, such as computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for
Telit and its licensors certain exclusive rights for copyrighted material, including the
exclusive right to copy, reproduce in any form, distribute and make derivative works of the
copyrighted material. Accordingly, any copyrighted material of Telit and its licensors
contained herein or in the Telit products described in this instruction manual may not be
copied, reproduced, distributed, merged or modified in any manner without the express
written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed
to grant either directly or by implication, estoppel, or otherwise, any license under the
copyrights, patents or patent applications of Telit, as arises by operation of law in the sale
of a product.

COMPUTER SOFTWARE COPYRIGHTS

The Telit and 3rd Party supplied Software (SW) products described in this instruction
manual may include copyrighted Telit and other 3rd Party supplied computer programs
stored in semiconductor memories or other media. Laws in the Italy and other countries
preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted
computer programs, including the exclusive right to copy or reproduce in any form the
copyrighted computer program. Accordingly, any copyrighted Telit or other 3rd Party
supplied SW computer programs contained in the Telit products described in this instruction
manual may not be copied (reverse engineered) or reproduced in any manner without the
express written permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase
of Telit products shall not be deemed to grant either directly or by implication, estoppel, or
otherwise, any license under the copyrights, patents or patent applications of Telit or other
3rd Party supplied SW, except for the normal non-exclusive, royalty free license to use that
arises by operation of law in the sale of a product.

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USAGE AND DISCLOSURE RESTRICTIONS

I. License Agreements

The software described in this document is the property of Telit and its licensors. It is
furnished by express license agreement only and may be used only in accordance with the
terms of such an agreement.

II. Copyrighted Materials

Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, without prior written permission of Telit

III. High Risk Materials

Components, units, or third-party products used in the product described herein are NOT
fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control
equipment in the following hazardous environments requiring fail-safe controls: the
operation of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air
Traffic Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its
supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High
Risk Activities.

IV. Trademarks

TELIT and the Stylized T Logo are registered in Trademark Office. All other product or
service names are the property of their respective owners.

V. Third Party Rights

The software may include Third Party Right software. In this case you agree to comply with
all terms and conditions imposed on you in respect of such separate software. In addition
to Third Party Terms, the disclaimer of warranty and limitation of liability provisions in this
License shall apply to the Third Party Right software.

TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED
FROM ANY THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY
MATERIALS INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM
WHICH THE SOFTWARE IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE
USE OF ANY OR ALL THE OTHER CODE IN CONNECTION WITH THE SOFTWARE,
INCLUDING (WITHOUT LIMITATION) ANY WARRANTIES OF SATISFACTORY
QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.

NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED
AND WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY,
ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODE
OR THE EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR BOTH THIS
LICENSE AND THE LEGAL TERMS APPLICABLE TO ANY SEPARATE FILES, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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LM940 HW Design Guide

Applicability Table

PRODUCTS

LM940

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Contents

NOTICE 2

COPYRIGHTS .................................................................................................. 2

COMPUTER SOFTWARE COPYRIGHTS ....................................................... 2

USAGE AND DISCLOSURE RESTRICTIONS ................................................ 3

APPLICABILITY TABLE .................................................................................. 4

CONTENTS ...................................................................................................... 5

1. INTRODUCTION ............................................................................ 9

Scope ............................................................................................. 9

Audience ........................................................................................ 9

Contact Information, Support ......................................................... 9

Text Conventions ......................................................................... 11

Related Documents ...................................................................... 12

2. GENERAL PRODUCT DESCRIPTION ........................................ 13

Overview ...................................................................................... 13

Product Variants and Frequency Bands ....................................... 13

2.2.1. RF Bands per Regional Variant .................................................... 13

Target market ............................................................................... 14

Main features ................................................................................ 14

Block Diagram .............................................................................. 16

TX Output Power .......................................................................... 17

RX Sensitivity ............................................................................... 17

Mechanical specifications ............................................................. 18

2.8.1. Dimensions ................................................................................... 18

2.8.2. Weight .......................................................................................... 18

Environmental Requirements ....................................................... 18

2.9.1. Temperature Range ..................................................................... 18

2.9.2. RoHS Compliance ........................................................................ 19

3. PINS ALLOCATION .................................................................... 20

Pin-out .......................................................................................... 20

LM940 Signals That Must Be Connected ..................................... 24

Pin Layout .................................................................................... 25

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4. POWER SUPPLY ........................................................................ 26

Power Supply Requirements ........................................................ 26

Power Consumption ..................................................................... 26

General Design Rules .................................................................. 27

4.3.1. Electrical Design Guidelines ......................................................... 27

4.3.1.1. + 5V Input Source Power Supply – Design Guidelines ................ 27

4.3.2. Thermal Design Guidelines .......................................................... 27

4.3.3. Power Supply PCB layout Guidelines .......................................... 28

RTC .............................................................................................. 29

Reference Voltage ........................................................................ 29

Internal LDO for GNSS bias ......................................................... 30

5. ELECTRICAL SPECIFICATIONS ................................................ 31

Absolute Maximum Ratings – Not Operational ............................. 31

Recommended Operating Conditions .......................................... 31

6. DIGITAL SECTION ...................................................................... 32

Logic Levels ................................................................................. 32

6.1.1. 1.8V Pins – Absolute Maximum Ratings ...................................... 32

6.1.2. 1.8V Standard GPIOs ................................................................... 32

6.1.3. 1.8V SIM Card Pins ...................................................................... 33

6.1.4. 2.85V Pins – Absolute Maximum Ratings .................................... 33

6.1.5. SIM Card Pins @2.85V ................................................................ 33

Power On ..................................................................................... 34

6.2.1. Initialization and Activation State .................................................. 34

Power Off ..................................................................................... 35

Unconditional Hardware Reset ..................................................... 36

Communication ports ................................................................... 37

6.5.1. USB Interface ............................................................................... 37

6.5.2. SIM Interface ................................................................................ 39

6.5.2.1. SIM Schematic Example .............................................................. 40

6.5.3. Control Signals ............................................................................. 41

6.5.3.1. W_DISABLE_N ............................................................................ 41

6.5.3.2. WAKE_N ...................................................................................... 41

6.5.3.3. WAN_LED_N ............................................................................... 42

6.5.4. General Purpose I/O .................................................................... 42

6.5.4.1. Using a GPIO Pin as Input ........................................................... 43

6.5.4.2. Using a GPIO Pin as Output ........................................................ 43

6.5.5. I2C – Inter-integrated circuit ......................................................... 43

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Using the Temperature Monitor Function ..................................... 44

7. RF SECTION ................................................................................ 45

Antenna requirements .................................................................. 45

Main Antenna Requirements ........................................................ 45

Antenna Diversity Requirements .................................................. 45

GNSS Receiver ............................................................................ 46

7.4.1. GNSS RF Front End Design......................................................... 46

Antenna connection ...................................................................... 47

7.5.1. Antenna Connector ...................................................................... 47

7.5.2. Antenna Cable .............................................................................. 48

7.5.3. Antenna Installation Guidelines .................................................... 48

8. AUDIO SECTION ......................................................................... 50

Audio Interface ............................................................................. 50

Digital Audio ................................................................................. 50

9. MECHANICAL DESIGN............................................................... 51

General ......................................................................................... 51

Finishing & Dimensions ................................................................ 51

Drawing ........................................................................................ 51

10. APPLICATION GUIDE ................................................................. 52

Debug of the LM940 Module in Production .................................. 52

Bypass Capacitor on Power Supplies .......................................... 52

EMC Recommendations .............................................................. 53

11. PACKAGING ............................................................................... 56

Tray .............................................................................................. 56

12. CONFORMITY ASSESSMENT ISSUES ..................................... 58

Approvals ..................................................................................... 58

Declaration of Conformity ............................................................. 58

FCC certificates ............................................................................ 58

IC certificates ................................................................................ 58

FCC/IC Regulatory notices ........................................................... 58

13. SAFETY RECOMMENDATIONS ................................................. 62

READ CAREFULLY ..................................................................... 62

14. REFERENCE TABLE OF RF BANDS CHARACTERISTICS ..... 63

15. ACRONYMS ................................................................................ 65

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16. DOCUMENT HISTORY ................................................................ 67

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1. INTRODUCTION

Scope

This document introduces the Telit LM940 module and presents possible and
recommended hardware solutions for developing a product based on the LM940 module.
All the features and solutions detailed in this document are applicable to all LM940 variants,
where “LM940” refers to the variants listed in the Applicability Table.

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

Information – LM940 refers to all modules listed in the Applicability
Table.

This document takes into account all the basic functions of a wireless module; a valid
hardware solution is suggested for each function, and incorrect solutions and common
errors to be avoided are pointed out.

Obviously, this document cannot embrace every hardware solution or every product that
can be designed. Where the suggested hardware configurations need not be considered
mandatory, the information given should be used as a guide and a starting point for properly
developing your product with the Telit LM940 module.

Information – The integration of the WCDMA/HSPA+/LTE LM940
cellular module within a user application must be done according to
the design rules described in this manual.

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
documentation errors contact Telit Technical Support at:

 [e-mail]
 [e-mail]
 [e-mail]
 [e-mail]

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Alternatively, use:

http://www.telit.com/en/products/technical-support-center/contact.php

For detailed information about where you can buy the Telit modules or for recommendations
on accessories and components visit:

http://www.telit.com

To register for product news and announcements or for product questions contact Telit’s
Technical Support Center (TTSC).

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

Telit appreciates feedback from the users of our information.

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Text Conventions

Danger – This information MUST be followed or catastrophic
equipment failure or bodily injury may occur.

Caution or Warning – Alerts the user to important points about
integrating the module, if these points are not followed, the module and
end user equipment may fail or malfunction.

Tip or Information – Provides advice and suggestions that may be
useful when integrating the module.

All dates are in ISO 8601 format, i.e. YYYY-MM-DD.

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Related Documents

 LM940 SW User Guide, 1VV0301343
 LM940 AT Commands Reference Guide, 80545ST10791A
 Generic EVB HW User Guide, 1VV0301249
 LM940 Interface Board HW User Guide, 1VV0301384
 SIM Integration Design Guide Application Note Rev10, 80000NT10001A
 Antenna Detection Application Note, 80000NT10002A

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2. GENERAL PRODUCT DESCRIPTION

Overview

The aim of this document is to present possible and recommended hardware solutions
useful for developing a product with the Telit LM940 Mini PCIe module.

LM940 is Telit’s platform for Mini PCIe module for applications, such as M2M applications,
industrial mobile router and table PC, based on the following technologies:

 LTE / WCDMA networks for data communication

 Designed for industrial grade quality

In its most basic use case, LM940 can be applied as a wireless communication front-end
for mobile router products, offering mobile communication features to an external host
CPU through its rich interfaces.

LM940 can further support customer software applications and security features. LM940
provides a software application development environment with sufficient system resources
for creating rich on-board applications. Thanks to a dedicated application processor and
embedded security resources, product developers and manufacturers can create products
that guarantee fraud prevention and tamper evidence without extra effort for additional
security precautions.

LM940 is available in hardware variants as listed in Applicability Table
The designated RF band sets per each variant are detailed in Section 2.2, Product

Variants and Frequency Bands.

Product Variants and Frequency Bands

The operating frequencies in LTE & WCDMA modes conform to the 3GPP specifications.

2.2.1. RF Bands per Regional Variant

This table summarizes the LM940, showing the supported band sets and the supported
band pairs and triple for carrier aggregation.

RF Bands and Carrier Aggregation

LTE FDD LTE TDD HSPA+

Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 25, 26, 28, 29,

30, 66

GNSS GPS, GLONASS, BeiDou, Galileo

LTE 2DL carrier aggregation combinations

North
America

B2+B2, B2+B4, B2+B5, B2+B12, B2+B13, B2+B17, B2+B29, B2+B30,
B4+B4, B4+B5, B4+B7, B4+B12, B4+B13, B4+B17, B4+B29, B4+B30,
B5+B30, B12+B12, B12+B30, B25+B25, B25+B26, B25+B41, B26+B41,
B29+B30, B41+B41

38, 40, 41 1, 2, 4, 5, 8

Europe B1+B20, B3+B3, B3+B7, B3+B20, B3+B38, B7+B7, B7+B8, B7+B20,

B38+B38

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Australia B1+B3, B1+B7, B1+B28, B3+B8, B3+B28, B5+B7, B5+B40, B7+B8,

B7+B20

LTE 3DL carrier aggregation combinations

North
America

B2+B2+B12/17, B2+B2+B13, B2+B2+B4, B2+B4+B5, B2+B4+B12,
B2+B4+B13, B2+B4+B29, B2+B5+B30, B2+B12+B12, B2+B12+B30,
B2+B29+B30, B4+B4+B5, B4+B4+B7, B4+B4+B12, B4+B4+B13,
B4+B5+B30, B4+B12+B12, B4+B12+B30, B4+B29+B30, B25+B26+B41,
B25+B41+B41, B26+B41+B41, B41+B41+B41

Europe B1+B3+B20, B1+B7+B20, B3+B3+B7, B3+B3+B20, B3+B7+B20,

B3+B7+B7, B3+B20+B38, B3+B38+B38

Australia B3+B3+B5, B3+B3+B8, B3+B7+B7, B3+B7+B28, B7+B7+B28,

B28+B40+B40, B40+B40+B40

Refer to Chapter 13 for details information about frequencies and bands.

Target market

LM940 can be used for telematics applications where tamper-resistance, confidentiality,
integrity, and authenticity of end-user information are required, for example:

 Mobile router
 Industrial equipment
 Home network
 Internet connectivity

Main features

The LM940 family of industrial grade cellular modules features LTE and multi-RAT module
together with an on-chip powerful application processor and a rich set of interfaces.

The major functions and features are listed below.

Main Features

Function Features

Module

Audio
subsystem

 Multi-RAT cellular module for data communication

o LTE FDD/TDD Cat11(600/75 Mbps DL/UL)
o WCDMA up to DC HSPA+, Rel.9

 Support for GPS, GLONASS, BeiDou, Galileo

 Support digital audio interface (optional)

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LM940 HW Design Guide

Function Features

Two USIM
ports – dual
voltage

 Support for dual SIM

 Class B and Class C support

 Clock rates up to 4 MHz

Application
processor

Application processor to run customer application code

 32 bit ARM Cortex-A7 up to 1.19 GHz running the Linux

operating system

 4Gbit NAND Flash + 2Gbit LPDDR2 MCP is supported to allow

for customer’s own software applications

Interfaces Rich set of interfaces, including:

 USB2.0 / USB3.0 – USB port is typically used for:

o Flashing of firmware and module configuration
o Production testing
o Accessing the Application Processor’s file system
o AT command access
o High-speed WWAN access to external host
o Diagnostic monitoring and debugging
o Communication between Java application environment and

an external host CPU

o NMEA data to an external host CPU

 Peripheral Ports – GPIOs

Major software
features

 Advanced security features

o Boot integrity of firmware up to customer applications
o Disable/secure re-enable of debug
o Embedded security

 FOTA (optional)

 Telit Unified AT command set

Form factor Mini PCIe Form factor (50.95x30x2.7mm), accommodating the

multiple RF bands

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Function Features

Environment
and quality

The entire module is designed and qualified by Telit for satisfying the
environment and quality requirements for use in applications

1

requirements

Single supply

The module generates all its internal supply voltages.

module

RTC The real-time clock is supported.

Operating
temperature

Range -40 °C to +85 °C
(conditions as defined in Section 2.9.1, Temperature Range)

Block Diagram

Below figure shows an overview of the internal architecture of the LM940 module.

LM940 Block Diagram

.

It includes the following sub-functions:

 Application processor, Module subsystem and Location processing with their

external interfaces. These three functions are contained in a single SOC.

 RF front end

1

InaccordancewithTelit’sRobustnessValidation,usingAEC‐Q100‐definedqualificationtests

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 Rich IO interfaces. Depending on which LM940 software features are enabled,

some of its interfaces that are exported through multiplexing may be used
internally and thus may not be usable by the application.

 PMIC with the RTC function inside

TX Output Power

Band Power class

3G WCDMA Class 3 (0.2W)

LTE All Bands Class 3 (0.2W)

RX Sensitivity

Below the 3GPP measurement conditions used to define the RX sensitivity:

Technology 3GPP Compliance

4G LTE Throughput >95% 10MHz Dual Receiver

3G WCDMA BER <0.1% 12.2 Kbps Dual Receiver

Product Band Typical Rx Sensitivity (dBm) * / **

(LTE BW = 10 MHz)

LM940

LTE FDD B1

LTE FDD B2

LTE FDD B3

LTE FDD B4

LTE FDD B5

LTE FDD B7

-101.5

-101.0

-101.5

-101.0

-102.5

-99.5

LTE FDD B8

LTE FDD B12

LTE FDD B13

LTE FDD B17

LTE FDD B20

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-102.5

-102.0

-102.0

-102.0

-102.0

LM940 HW Design Guide

LTE FDD B25

LTE FDD B26

LTE FDD B28

LTE FDD B30

LTE FDD B66

LTE TDD B38

LTE TDD B40

LTE TDD B41

LM940 WCDMA FDD B1

WCDMA FDD B2

WCDMA FDD B4

WCDMA FDD B5

WCDMA FDD B8

* LTE Rx Sensitivity shall be verified by using both (all) antenna ports simultaneously.

** 3.3 Voltage / Room temperature

-101.0

-102.0

-102.0

-100.5

-101.0

-100.0

-100.0

-99.5

-108.5

-108.5

-108.5

-109.5

-109.5

Mechanical specifications

2.8.1. Dimensions

The LM940 module’s overall dimensions are:

 Length: 50.95 mm, +/- 0.15 mm tolerance

 Width: 30.00 mm, +/- 0.15 mm tolerance

 Thickness: 2.70 mm, +/- 0.15 mm tolerance

2.8.2. Weight

The nominal weight of the LM940 module is 9.6 gram.

Environmental Requirements

2.9.1. Temperature Range

Operating

Temperature Range

–20°C ~ +55°C This range is defined by 3GPP (the global

standard for wireless mobile communication).
Telit guarantees its modules to comply with all
the 3GPP requirements and to have full
functionality of the module with in this range.

Note

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Storage and non-

operating

Temperature Range

Note

–40°C ~ +85°C Telit guarantees full functionality within this

range as well. However, there may possibly
be some performance deviations in this
extended range relative to 3GPP
requirements, which means that some RF
parameters may deviate from the 3GPP
specification in the order of a few dB. For
example: receiver sensitivity or maximum
output power may be slightly degraded.

Even so, all the functionalities, such as call
connection, SMS, USB communication,
UART activation etc., will be maintained, and
the effect of such degradations will not lead to
malfunction.

–40°C ~ +85°C

2.9.2. RoHS Compliance

As a part of the Telit corporate policy of environmental protection, the LM940 complies
with the RoHS (Restriction of Hazardous Substances) directive of the European Union
(EU directive 2011/65/EU).

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3. PINS ALLOCATION

Pin-out

LM940 Pin-out

Pin Signal I/O Function Type Comment

USB HS 2.0 Communication Port

38 USB_D+ I/O USB 2.0 Data Plus Analog

36 USB_D- I/O USB 2.0 Data Minus Analog

USB SS 3.0 Communication Port

25 USB_SS_TX_P O USB 3.0 super-

speed transmit –

plus

23 USB_SS_TX_M O USB 3.0 super-

speed transmit –

minus

33 USB_SS_RX_P I USB 3.0 super-

speed receive – plus

31 USB_SS_RX_M I USB 3.0 super-

speed receive –

minus

SIM Card Interface 1

8 SIMVCC1 O Supply output for an

external UIM1 card

10 SIMIO1 I/O Data connection with

an external UIM1

card

Analog

Analog

Analog

Analog

1.8V /

2.85V

1.8V /

2.85V

Power

12 SIMCLK1 O Clock output to an

external UIM1 card

14 SIMRST1 O Reset output to an

external UIM1 card

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1.8V /

2.85V

1.8V /

2.85V

LM940 HW Design Guide

SIM Card Interface 2

13 SIMVCC2 O Supply output for an

external UIM2 card

19 SIMIO2 I/O Data connection with

an external UIM2

card

17 SIMCLK2 O Clock output to an

external UIM2 card

7 SIMRST2 O Reset output to an

external UIM2 card

Digital I/O (GPIOs)

3 GPIO_01 I/O General purpose

I/O, SIMIN1

depending on

product

5 GPIO_02 I/O General purpose

I/O, SIMIN2

depending on

product

1.8 / 2.85V Power

1.8 / 2.85V

1.8 / 2.85V

1.8 / 2.85V

1.8V

1.8V

44 GPIO_03 I/O General purpose I/O 1.8V

46 GPIO_04 I/O General purpose I/O 1.8V

Control Signal

1 WAKE_N O Host wake-up 1.8V

20 W_DISABLE_N I RF disable 1.8V

42 WAN_LED_N O LED control 1.8V

Miscellaneous Functions

11 VREG_L6_1P8 O Reference Voltage 1.8V Power

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