Telit Wireless Solutions LE915A P Series Hw User Manual
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Telit Wireless Solutions LE915A P Series Hw User Manual

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LE915Ax-P
HW User Guide
1VV0301680 Rev.0 – 2020-09-16
Mod. 0805 2017-01 Rev.6

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Summary of Contents for Telit Wireless Solutions LE915A P Series

  • Page 1 LE915Ax-P HW User Guide 1VV0301680 Rev.0 – 2020-09-16 Mod. 0805 2017-01 Rev.6...
  • Page 2 LE915Ax-P HW User 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.
  • Page 3 LE915Ax-P HW User Guide USAGE AND DISCLOSURE RESTRICTIONS 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.
  • Page 4 LE915Ax-P HW User Guide APPLICABILITY TABLE PRODUCTS LE915A6-P LE915A4-P 1VV0301680 Rev. 0 Page 4 of 38 2020-09-16...

  • Page 5: Table Of Contents

    LE915Ax-P HW User Guide CONTENTS INTRODUCTION .................... 7 Scope ......................7 Audience......................7 Contact Information, Support ................7 Text Conventions .................... 8 Related Documents ..................8 GENERAL PRODUCT DESCRIPTION ............9 Main features ....................9 Cellular Frequency bands and CA combinations..........9 2.2.1.
  • Page 6 LE915Ax-P HW User Guide Antenna ports ....................24 Antenna specification recommended ............24 Transmission line design guidelines .............. 24 Antenna installation guidelines ..............25 RF performance .................... 26 5.5.1. RF power output .................... 26 5.5.2. RX Sensitivity ....................26 ENVIRONMENT REQUIREMENT ..............27 Temperature range ..................

  • Page 7: Introduction

    LE915Ax-P HW User Guide INTRODUCTION Scope This document introduces the Telit LE915Ax-P family and presents possible and recommended hardware solutions for developing a product based on the LE915Ax-P modules. In this document all the basic functions of the module will be considered; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced.

  • Page 8: Text Conventions

    LE915Ax-P HW User Guide 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. Text Conventions Danger – This information MUST be followed, or catastrophic equipment failure or bodily injury may occur.

  • Page 9: General Product Description

    LE915Ax-P HW User Guide GENERAL PRODUCT DESCRIPTION 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.

  • Page 10: Carrier Aggregation (Le915A6-P Only)

    LE915Ax-P HW User Guide 2.2.2. Carrier Aggregation (LE915A6-P only) The following tables list the 2CC configurations available on LE915A6-P. Table 2.2.2-1 Two Carrier Component Carrier Aggregation Configurations 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 Target market The LE915Ax-P family is specifically designed to enable cellular data connectivity on CBRS networks operating on LTE band 48 in US.

  • Page 11: Pin Assignment

    LE915Ax-P HW User Guide Pin Assignment The main function and basic description of the LCC pads are swacribed in the table below. Table 2.5-1 Host Interface Summary Pad# Pad Name Comments ANT_DIV Auxiliary antenna ANT_MAIN Main antenna HWID2 1.8V, reserved HWID1 1.8V, reserved VBAT2...
  • Page 12 LE915Ax-P HW User Guide FFF_FFH 1.8V, reserved UART1_SIN 1.8V, UART1 TRST_N JTAG for debugging JTAG for debugging JTAG for debugging UART1_SOUT 1.8V, UART1 JTAG for debugging JTAG for debugging Table 2.5-2 Ground Pads Pad # Pad Name Comment 1, 3, 5, 10, 13, 29, 61 81 to 110 Table 2.5-3 Reserved Pads Pad #...

  • Page 13: Power Supply

    LE915Ax-P HW User Guide 3. POWER SUPPLY The power supply circuitry and board layout are very important factors of the entire customer device design and could affect on the overall functionality and radio performance of the end device. Please refer to the following requirements and guidelines carefully to ensure device quality. Power Supply Requirement The LE915Ax-P power requirements of VBAT1 and VBAT2 are as follows: Table 3.1-1 Power Supply Requirement...

  • Page 14: General Design Rules

    LE915Ax-P HW User Guide General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: • Electrical design • Thermal design • PCB layout 3.4.1. Electrical Design Guidelines The electrical design of the power supply strongly depends on the power source from which power is drained.

  • Page 15: Pcb Pad Design

    LE915Ax-P HW User Guide power supply performances. If the power supply used is a switching type - it can be placed close to an inductor to reduce a noise and ripple. • A protection diode must be placed close to the power input port of the module to prevent from any electrical shock and/or polarity inversion.

  • Page 16: Interface Details

    LE915Ax-P HW User Guide 4. INTERFACE DETAILS Power and Ground All the power supply pads, and ground should be connected. Pin# Pin Name Comment 59, 60 VBAT1 All VBAT pads shall be connected. 11, 12 VBAT2 1, 3, 5, 10, 13, 29, 61 All GND pads shall be connected to the same copper.

  • Page 17: Power Off Sequence

    LE915Ax-P HW User Guide Step 4: Wait until communicating on AT command is possible or until the +SYSSTART URC is out. Which is typically in the range of 30 ~ 60 seconds in normal operating mode. If there is no response over than 60 Sec, turn off the VBAT1 and VBAT2 to make it zero voltage, then try again from the step 1.

  • Page 18: Uart Interface

    LE915Ax-P HW User Guide Figure 4.3-1 example of USB interface NOTE: On the application board. It is highly recommended to insert an optional connector or test points that can be switched for direct connection of the external PC for later SW upgrade or debugging. UART interface The LE915Ax-P supports one UART with HW flow control and two UARTs without flow control.
  • Page 19 LE915Ax-P HW User Guide NOTE: When the UART signals are used as the communication port between the host and modem and flow control is not used, UART2_CTS line must set to logical LOW. If the UART port is not used, all UART signals can be left unconnected.
  • Page 20 LE915Ax-P HW User Guide Figure 4.4-2 Typical UART interface without HW flow control Depending on the serial port type on the application side, a level translator circuit may be required. The nominal voltage level of the UART interface is 1.8V. Figure 4.4-3 shows a typical level translator circuit for interfacing the external device with UART ports.

  • Page 21: Led Indication

    LE915Ax-P HW User Guide Figure 4.4-3 Typical level translator circuit WARNING: The digital input lines, operating at 1.8V CMOS levels, have absolute maximum input voltage of 3.6V. The level translator IC outputs on the module side (i.e. LE915Ax-P inputs) will cause damage to the module inputs if the level translator is powered even with nominal 3.8V power.

  • Page 22: Sim Interface

    LE915Ax-P HW User Guide Figure 4.5-1 Typical LED indicator circuit SIM interface LE915Ax-P modules support single SIM interface. On the application side, a pull-up resistor needs to be connected to the SIM_DETECT port: Logic HIGH indicates a SIM is plugged in. Thus, it is required to apply a SIM holder providing a closed circuit to GND when a SIM is not inserted.

  • Page 23: Reserved Pads

    LE915Ax-P HW User Guide NOTE: If the application requires SIM card insertion or removal support, then the SIM card handler must include a removal/insertion pad detector in order to allow the module firmware to process the event immediately. Default SW configuration is to support SIM_DETECT. If the SIM holder doesn’t have a SIM detect switch, it is required to keep HIGH the SIM_DETECT port to avoid floating and to ensure the SIM is always detected as present.

  • Page 24: Antenna Interface And Radio Performance

    LE915Ax-P HW User Guide 5. ANTENNA INTERFACE AND RADIO PERFORMANCE Antenna ports Antenna connection is one of the most important aspect in the entire application design as it strongly affects the overall radio performance. • It is recommended to have a phi type antenna matching circuit to transform RF path impedance to 50ohms if needed.

  • Page 25: Antenna Installation Guidelines

    LE915Ax-P HW User Guide • If a Ground plane is required in line geometry, it shall be continuous and sufficiently extended, so the geometry can be as similar as possible to the related canonical model; • Keep, if possible, at least one layer of the PCB used only for the Ground plane; If possible, use this layer as reference Ground plane for the transmission line;...

  • Page 26: Rf Performance

    LE915Ax-P HW User Guide RF performance 5.5.1. RF power output LTE / CBRS Band Conducted Power (dBm) @ BW 5MHz, Full RB Band 42 23 +1/-1.7 Band 43 23 +1/-1.7 Band 48 22 +1/-1.7 5.5.2. RX Sensitivity LTE Band / CBRS Band Typical sensitivity (dBm) @ BW 5MHz Band 42 <...

  • Page 27: Environment Requirement

    LE915Ax-P HW User Guide 6. ENVIRONMENT REQUIREMENT Temperature range Table 6.1-1 Temperature range Items Type Units Storage temperature °C Recommended operating temperature °C (3GPP compliant) Extendable (with limited performance, TBD) °C 1VV0301680 Rev. 0 Page 27 of 38 2020-09-16...

  • Page 28: Mechanical Specifications

    LE915Ax-P HW User Guide 7. MECHANICAL SPECIFICATIONS Weight The typical weight of the LE915Ax-P is about 5.1 grams. Dimension and pad numbering The following figure shows the overall mechanical dimension and pad numbering of LE915Ax-P. Figure 7.2-1 Overall mechanical dimension (Bottom view) 1VV0301680 Rev.

  • Page 29: Reflow Information

    LE915Ax-P HW User Guide 8. REFLOW INFORMATION Figure 8-1 Reflow profile for assembly Table 8-1 Reflow parameters Parameter Setting Preheat Time Temp: 150 °C ~ 200°C Time: 105+/-15 seconds Dwell Time (Liquidous Time) Temp: over 220 °C Time: 70+5/-10 seconds Peak Temperature 240+10/-5 °C...

  • Page 30: Packaging

    LE915Ax-P HW User Guide 9. PACKAGING The LE915Ax-P is delivered in Tape-and-Reel. One reel can hold up to 500 pieces. Each reel is included in a box, and a carton can contain five boxes, hence up to 2500 pieces. Figure 9-1 Tape Dimensions Details Figure 9-2 Packing description 1VV0301680 Rev.
  • Page 31 LE915Ax-P HW User Guide 1VV0301680 Rev. 0 Page 31 of 38 2020-09-16...

  • Page 32: Regulatory Approval

    LE915Ax-P HW User Guide REGULATORY APPROVAL This following statement applies to all products based on Telit LE915Ax-P supporting Band 48 that would be deployed in CBRS network in USA. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
  • Page 33 LE915Ax-P HW User Guide 2.3 Summarize the specific operational use conditions The module is tested for standalone mobile RF exposure use condition. Any other usage conditions such as co-location with other transmitter(s) or being used in a portable condition will need a separate reassessment through a class II permissive change application or new certification.
  • Page 34 LE915Ax-P HW User Guide circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user's manual of the end product which integrates this module.

  • Page 35: Safety Recommendations

    LE915Ax-P HW User Guide SAFETY RECOMMENDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas: •...

  • Page 36: Acronyms

    LE915Ax-P HW User Guide ACRONYMS Carrier Aggregation Citizens Band Radio Service CBRS Down Link Effective Isotopically Radiated Power EIRP Electrical Over Shock Electrostatic Discharge Equivalent Series Resistance Evolved Universal Terrestrial Radio Access E-UTRA Leadless Chip Carrier Long Term Evolution Machine to machine Point of Sales Printed Circuit Board Specific Absorption Rate...

  • Page 37: Document History

    LE915Ax-P HW User Guide DOCUMENT HISTORY Revision Date Changes 2020-09-16 Draft version 1VV0301680 Rev. 0 Page 37 of 38 2020-09-16...
  • Page 38 Mod. 0805 2017-01 Rev.6...

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