Telit Wireless Solutions LE915A P Series Guide

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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

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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

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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

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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:
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]

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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

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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
42
3500
3400 –3600
TDD
43
3700
3600 –3800
TDD
48
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.

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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
42
23 +1/-1.7
43
23 +1/-1.7
48
22 +1/-1.7
Table 5: Transmission Output Power
RX Sensitivity
LTE/CBRS Band
Typical sensitivity (dBm) @BW 5MHz
42
<-101
43
<-101
48
<-101
Table 6: Reception Sensitivity

LE915Ax-P Hardware Design Guide
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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