Quectel LC79H (AL) User Manual
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Quectel LC79H (AL) User Manual

Quectel LC79H (AL) User Manual

Gnss module
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LC79H (AL)
EVB User Guide
GNSS Module Series
Version: 1.1
Date: 2023-05-10
Status: Released

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Summary of Contents for Quectel LC79H (AL)

  • Page 1 LC79H (AL) EVB User Guide GNSS Module Series Version: 1.1 Date: 2023-05-10 Status: Released...

  • Page 2: Legal Notices

    GNSS Module Series At Quectel, our aim is to provide timely and comprehensive services to our customers. If you require any assistance, please contact our headquarters: Quectel Wireless Solutions Co., Ltd. Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai...

  • Page 3: Third-Party Rights

    Except as otherwise set forth herein, nothing in this document shall be construed as conferring any rights to use any trademark, trade name or name, abbreviation, or counterfeit product thereof owned by Quectel or any third party in advertising, publicity, or other aspects.

  • Page 4: Safety Information

    The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any terminal incorporating Quectel LC79H (AL) module. Manufacturers of the terminal should distribute the following safety precautions to users and operating personnel, and incorporate them into all manuals supplied with the product.

  • Page 5: About The Document

    GNSS Module Series About the Document Document Information Title LC79H (AL) EVB User Guide Subtitle GNSS Module Series Document Type EVB User Guide Document Status Released Revision History Version Date Description 2022-03-14 Creation of the document 2022-07-20 First official release 1.

  • Page 6: Table Of Contents

    GNSS Module Series Contents Safety Information ............................3 About the Document ..........................4 Contents ..............................5 Table Index ..............................6 Figure Index ..............................7 Introduction ............................8 General Overview ..........................9 2.1. EVB Kit ............................9 2.2. Connect Cable and Antenna to EVB ..................11 EVB Interfaces ...........................
  • Page 7 GNSS Module Series Table Index Table 1: List of Kit Components ......................... 10 Table 2: Detailed EVB Interfaces ....................... 13 Table 3: U409 Pin Description ........................14 Table 4: U410 Pin Description ........................15 Table 5: QGNSS Interface Explanation...................... 17 Table 6: Related Documents ........................
  • Page 8 GNSS Module Series Figure Index Figure 1: EVB and Components ........................9 Figure 2: EVB and Components Assembly ....................11 Figure 3: EVB Top View ..........................12 Figure 4: COM Port and Rate Setting ......................16 Figure 5: QGNSS Interface (Connected) ....................17 Figure 6: Tool Startup ..........................

  • Page 9: Introduction

    GNSS Module Series Introduction This document provides information on the steps needed to evaluate the Quectel LC79H (AL) module using the Evaluation Board (EVB). The EVB is a convenient tool that allows you to become familiar with the LC79H (AL) module.

  • Page 10: General Overview

    GNSS Module Series General Overview 2.1. EVB Kit The EVB kit includes: Evaluation Board (EVB), active GNSS antenna, Type-B USB cables, bolts and coupling nuts. The EVB kit components are shown in the figure below. Check for details. Table 1: List of Kit Components Active GNSS Antenna Type-B USB Cables Bolts and Coupling Nuts...
  • Page 11  BDS B1I and B2a  QZSS L1 C/A and L5  SBAS L1  Others Bolts and Coupling Nuts 4 pairs  NOTE Request Quectel Technical Support (support@quectel.com) for details about Quectel Active GNSS Antenna. LC79H(AL)_EVB_User_Guide 10 / 32...

  • Page 12: Connect Cable And Antenna To Evb

    GNSS Module Series 2.2. Connect Cable and Antenna to EVB The connection between the EVB and its components is shown in the figure below. Figure 2: EVB and Components Assembly  NOTE 1. It is optional to connect PC and the “POWER” (J204) on the EVB via a Type-B USB cable. For more information, see Chapter 3.2 EVB Interfaces.

  • Page 13: Evb Interfaces

    GNSS Module Series EVB Interfaces 3.1. EVB Top View EVB top view is shown in the figure below. S201 (Power switch) D514 (POWER and VCC indication LEDs) J509 (USB connector) D520 (TXD and 1PPS indication LEDs) J204 (POWER connector) U409 (Test points) U103 U410 (Test points) LC79H (AL) GNSS module...

  • Page 14: Evb Interfaces

    GNSS Module Series 3.2. EVB Interfaces The EVB interfaces are detailed in the table below. Table 2: Detailed EVB Interfaces Function Interfaces Description J204 J204: Only used to supply power to avoid the POWER insufficient supply of J509. J509: Used to communicate and supply Power Supply power.
  • Page 15 GNSS Module Series The U409 and U410 test points of LC79H (AL) are shown below: Table 3: U409 Pin Description Test Point No. Test Point Label Test Point Function Description PIN1 U103: Pin 1 Ground PIN2 U103: Pin 2 TXD: Transmits data No label U103: Pin 3 RXD: Receives data...
  • Page 16 GNSS Module Series Table 4: U410 Pin Description Test Point No. Test Point Label Test Point Function Description PIN17 U103: Pin 17 I2C_SCL: I2C serial clock WAKEUP: Wake up the module PIN18 U103: Pin 18 from the Backup mode. No label Reserved No label Reserved...

  • Page 17: Testing And Firmware Upgrading Via Qgnss Tool

    GNSS Module Series Testing and Firmware Upgrading via QGNSS Tool This chapter explains how to use the QGNSS software tool for verifying the status of GNSS module and for firmware upgrade. For more information about QGNSS use, see document [2] QGNSS user guide.

  • Page 18: Qgnss Interface Explanation

     NOTE Ensure the CP210x driver has been installed when you use the QGNSS tool for the first time. For more information about the driver, please contact the Quectel Technical Support (support@quectel.com). 4.2. QGNSS Interface Explanation You can view GNSS information, such as C/N message, time, position, speed, and precision in the QGNSS interface.
  • Page 19 GNSS Module Series Icon Explanation  NavIC: 0  SBAS: 0 The sky view on the right shows the position of the satellites in use. GPS satellite BDS satellite GLONASS satellite Galileo satellite QZSS satellite NavIC satellite PRN 30 C/N is 39 dB-Hz.

  • Page 20: Firmware Upgrading

    GNSS Module Series 4.3. Firmware Upgrading Power on the EVB before upgrading the firmware, see for details. Chapter 4.1 Testing via QGNSS Firmware upgrading steps: Step 1: Open QGNSS tool, and click “Tools” and select “Firmware Download” in the drop-down box. ①...
  • Page 21 GNSS Module Series ③ Figure 8: Firmware Selecting Step 4: Click the “Run” button and the short press the RESET button after the progress bar prompts you to reset the module. ④ Figure 9: Firmware Upgrading – 1 LC79H(AL)_EVB_User_Guide 20 / 32...
  • Page 22 GNSS Module Series ⑤ Figure 10: Firmware Upgrading – 2 Step 5: Upon successful firmware upgrading, the QGNSS tool’s progress bar on the screen will indicate “100 %”. Figure 11: Successful Firmware Upgrading LC79H(AL)_EVB_User_Guide 21 / 32...

  • Page 23: Evb And Antenna Installation

    GNSS Module Series EVB and Antenna Installation 5.1. GNSS Antenna Installation The installation environment affects antenna reception performance and satellite visibility, which in turn affect the position quality of a GNSS receiver. In addition, antenna’s orientation can also impact its reception performance.

  • Page 24: Measuring Power Consumption

    GNSS Module Series Measuring Power Consumption 6.1. Power Consumption at Different Stages Module power consumption is measured in three stages: acquisition and tracking (including almanac update), tracking (almanac update is over) and upon entering Backup mode. Acquisition and Tracking (including almanac update): 0 s to 12.5 min ...
  • Page 25 GNSS Module Series Ammeter Figure 13: VCC Power Consumption Measured with Ammeter Detailed steps for measuring VCC power consumption with a power consumption meter: Step 1: Switch off the power supply (S201) and pull out the VCC_MODULE jumper cap (J102). Make sure the positive pole of the power consumption meter is to be connected to pin 2 (without arrow silkscreen) of J102, and the negative pole is connected to GND.

  • Page 26: V_Bckp Power Consumption Measurement

    GNSS Module Series 6.3. V_BCKP Power Consumption Measurement Before measuring the V_BCKP power consumption, you must connect the components to EVB to ensure that the module can communicate and fix normally. See for details. Chapter 4.1 Testing via QGNSS Detailed steps for measuring V_BCKP power consumption with an ammeter: Step 1: Switch off the power supply (S201).
  • Page 27 GNSS Module Series Power Consumption V_BCKP Meter Figure 16: V_BCKP Power Consumption Measured with Power Consumption Meter NOTE 1. Adjust the current resolution when using the power consumption meter. 2. The power value can be calculated according to the following formula: P = V ×...

  • Page 28: Evb Framework

    GNSS Module Series EVB Framework The power is supplied to EVB via Type-B, and then to GNSS module via a low dropout regulator (LDO). GNSS module outputs the signals from communication interface on EVB via USB to UART Bridge Chip (CP2102N).

  • Page 29: Common Problems And Troubleshooting

    Verify whether the module is in normal operating mode.  Check that the downloaded firmware is correct.  Confirm that the correct COM port has been selected.   NOTE For the problem(s) that cannot be solved, please contact Quectel Technical Support (support@quectel.com). LC79H(AL)_EVB_User_Guide 28 / 32...

  • Page 30: Cautions

    Ensure that the measurement method is correct. If there are significant differences between  parameters tested via EVB and those provided by Quectel, please contact Quectel Technical Support. Note that momentary data obtained from measurement cannot always be regarded as reference data, ...

  • Page 31: Appendix References

    GNSS Module Series Appendix References Table 6: Related Documents Document Name Quectel_LC79H(AL)_Hardware_Design [2] Quectel_QGNSS_User_Guide Table 7: Terms and Abbreviations Abbreviation Description 1PPS One Pulse Per Second 2 Dimension 3 Dimension BeiDou Navigation Satellite System Carrier-to-Noise Ratio Circular Error Probable COM Port Communication Port Direct Current Digital Input...
  • Page 32 GNSS Module Series Abbreviation Description GLONASS Global Navigation Satellite System (Russia) Ground GNSS Global Navigation Satellite System Global Positioning System HDOP Horizontal Dilution of Precision Inter-Integrated Circuit Input/Output Light Emitting Diode Longitude, Latitude, and Altitude Mean Sea Level NavIC Indian Regional Navigation Satellite System NMEA NMEA (National Marine Electronics Association) 0183 Interface Standard Personal Computer...
  • Page 33 GNSS Module Series Abbreviation Description Standard Positioning Service TTFF Time to First Fix Transmit Data (Pin) UART Universal Asynchronous Receiver/Transmitter Universal Serial Bus Coordinated Universal Time WGS84 World Geodetic System 1984 LC79H(AL)_EVB_User_Guide 32 / 32...

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