Telit Wireless Solutions LE915A P Series Leitfaden

LE915Ax-P

HW Design Guide

1VV0301680 Rev. 2 –2021-10-04

Telit Technical Documentation

LE915Ax-P Hardware Design Guide

1VV0301680 Rev. 2 Page 2of 51 2021-10-04

Not Subject to NDA

APPLICABILITY TABLE

PRODUCTS

LE915A6-P

LE915A4-P

 
 LE915Ax-P Hardware Design Guide 
 
 
 
1VV0301680 Rev. 2 Page 3of 51 2021-10-04 
Not Subject to NDA 
CONTENTS 
APPLICABILITY TABLE 2 
CONTENTS 3 
1. INTRODUCTION 6 
 Scope 6 
 Audience 6 
 Contact Information, Support 6 
 Symbol Conventions 7 
 Related Documents 7 
2. GENERAL PRODUCT DESCRIPTION 8 
 Overview 8 
 Cellular Frequency Bands and CA Combinations 8 
2.2.1. Frequency Bands 8 
2.2.2. Carrier Aggregation (LE915A6-P only) 8 
 Target Market 8 
 Main Features 9 
 TX Output Power 9 
 RX Sensitivity 9 
 Mechanical Specifications 10 
2.7.1. Dimensions and LCC Pads Layout 10 
2.7.2. Weight 10 
 Temperature Range 10 
3. PINS ALLOCATION 11 
 Pin-out 11 
4. POWER SUPPLY 16 
 Main Power Supply Requirements 16 
 Power Consumption (Typical) 16 
 1.8V Power Output 17 
 General Design Rule 17 
4.4.1. Electrical Design Guidelines 17 

 
 LE915Ax-P Hardware Design Guide 
 
 
 
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4.4.1.1. +5V Source Power Supply Design Guidelines 17 
4.4.2. Thermal Design Guidelines 18 
4.4.3. Power Supply PCB Layout Guidelines 18 
5. INTERFACE DETAILS 21 
 Power On.Off and Reset Control 21 
5.1.1. Power On Sequence 21 
5.1.2. Power Off Sequence 21 
 Communication Ports 22 
5.2.1. USB 2.0 Interface 22 
5.2.2. UART Interfaces 23 
5.2.2.1. RS232 Level Translation 25 
 General Purpose I/O 26 
 LED Indication 27 
 External SIM Holder 27 
 Reserved Pins 28 
6. RF SECTION 29 
 Antenna Requirements 29 
6.1.1. PCB Design Guidelines 29 
6.1.2. PCB Guidelines in Case of FCC Certification 30 
6.1.2.1. Transmission Line Design 31 
6.1.2.2. Transmission Line Measurements 31 
6.1.2.3. Antenna Installation Guidelines 33 
7. MECHANICAL DESIGN 34 
 Drawing 34 
8. APPLICATION PCB DESIGN 35 
 PCB Pad Design 35 
 Solder Reflow 35 
 Inspection 37 
9. PACKAGING 38 
 Reel 38 
 Carrier Tape Detail 38 

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Packaging Detail 39

Moisture Sensitivity 39

10. REGULATORY APPROVAL 41

11. PRODUCT AND SAFETY INFORMATION 45

Copyrights and Other Notices 45

11.1.1. Copyrights 45

11.1.2. Computer Software Copyrights 45

Usage and Disclosure Restrictions 46

11.2.1. License Agreements 46

11.2.2. Copyrighted Materials 46

11.2.3. High Risk Materials 46

11.2.4. Trademarks 47

11.2.5. Third Party Rights 47

11.2.6. Waiver of Liability 47

Safety Recommendations 48

12. GLOSSARY 49

13. DOCUMENT HISTORY 50

LE915Ax-P Hardware Design Guide

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1. INTRODUCTION

Scope

This document introduces the Telit LE915Ax-P family and presents possible and

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

LE915Ax-P modules.

In this document all the basic functions of the module will be considered; for each of them

a suitable hardware solution will be suggested and eventually the wrong solutions and

common errors to be avoided will be evidenced. This document cannot embrace all

hardware solutions and products that may be designed. The information provided should

be used as a guide and starting point to successfully develop your product with the Telit

LE915Ax-P modules.

Information: The Integration of LTE/CBRS LE915Ax-P cellular

modules in single mode within a user application must be performed

according to the design rules described in this manual.

The information presented in this document is believed to be accurate and reliable.

However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor any

infringement of patents or other rights of third parties which may result from its use. No

license is granted by implication or otherwise under any patent rights of Telit

Communications S.p.A. other than for circuitry embodied in Telit products. This

document is subject to change without notice.

Audience

This document is intended for system integrators that are using the Telit LE915Ax-P

family in their products.

Contact Information, Support

For technical support and general questions please e-mail:

•

•

•

•

LE915Ax-P Hardware Design Guide

1VV0301680 Rev. 2 Page 7of 51 2021-10-04

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•

TS[email protected]

Alternatively, use:

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

Product information and technical documents are accessible 24/7 on our web site:

https://www.telit.com

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

•LE915Ax-P family AT command reference guide, 80671ST11047A

•LE915Ax-P family Software User Guide, 1VV0301685

LE915Ax-P Hardware Design Guide

1VV0301680 Rev. 2 Page 8of 51 2021-10-04

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2. GENERAL PRODUCT DESCRIPTION

Overview

The LE915Ax-P family consists of an LTE CAT-6 and CAT-4 modules and is specifically

designed to enable cellular data connectivity on CBRS networks operating on TDD LTE

band 48 in US. It can also operate on other networks operating on LTE bands 42 and 43.

This document provides technical information about LE915Ax-P LCC modules.

Cellular Frequency Bands and CA Combinations

2.2.1. Frequency Bands

Following the list of operating frequencies on LTE mode.

E-UTRA Band

Freq. (MHz)

UL/DL Frequency (MHz)

Duplex Mode

3500

3400 –3600

TDD

3700

3600 –3800

TDD

3500

3550 - 3700

TDD

Table 2: Frequency bands supported

2.2.2. Carrier Aggregation (LE915A6-P only)

Following the list of 2CC configurations available on LTE915A6-P.

Applicable model

2CC DL CA Combinations

LE915A6-P

CA_42A-42A; CA_43A-43A; CA_48A-48A; CA_42A-43A; CA_42C; CA_43C; CA_48C

Table 3: Two carrier component carrier aggregation combinations

Target Market

The LE915Ax-P family is specifically designed to enable cellular data connectivity on

CBRS networks operating on LTE band 48 in US. It can also operate on other networks

operating on LTE band 42 and 43.

It also meets the requirements for M2M application such as metering, tracking system,

security solutions, routers, wireless POS, among others.

LE915Ax-P Hardware Design Guide

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Main Features

Main features of the LE915Ax-P are listed below.

Feature

Description

Physical

LCC (32 x 29 x2.4mm),

134 pads carrying useful signals

Power supply

Nominal 3.8V single power supply

Operating voltage

recommended

-30 ~ +60 °C ambient

Serial interface

USB 2.0, 1 High Speed UART with HW flow control and 2 Low Speed UARTs w/o flow

control

Cellular technology

LE915A6-P: LTE CAT.6, TDD, 200Mbps on DL, 3GPP release 10

LE915A4-P: LTE CAT.4, TDD, 100Mbps on DL, 3GPP release 9

Diversity/2nd RX

4G: all operating on all supported frequency bands

SIM interface

Single interface for 1.8V and 3.0V

Antenna ports

1 main and 1 auxiliary antenna ports

Table 4: LE915Ax-P Feature Summary

TX Output Power

LTE/CBRS Band

Conducted power (dBm) @BW 5MHz, Full RB

23 +1/-1.7

22 +1/-1.7

Table 5: Transmission Output Power

RX Sensitivity

LTE/CBRS Band

Typical sensitivity (dBm) @BW 5MHz

<-101

Table 6: Reception Sensitivity

LE915Ax-P Hardware Design Guide

1VV0301680 Rev. 2 Page 10 of 51 2021-10-04

Not Subject to NDA

Mechanical Specifications

2.7.1. Dimensions and LCC Pads Layout

The overall dimensions of LE915Ax-P family are:

•Length: 32 mm

•Width: 29 mm

•Thickness: 2.4 mm

2.7.2. Weight

The nominal weight of the LE915Ax-P family is 5.1 grams.

Temperature Range

Tempeurature Range

Note

Recommended Operating Temperature

Range (3GPP compliant)

–30°C to +60°C

The module is fully functional and compliant

according to regulatory standards.

Storage Temperature Range

–40°C to +85°C

The module is not powered and not connected

to power supply

Table 7: Temperature Range

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