Quectel LG77L EVB User Manual
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Quectel LG77L EVB User Manual

Quectel LG77L EVB User Manual

Gnss module series
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LG77L
EVB User Guide
GNSS Module Series
Version: 1.0
Date: 2021-03-23
Status: Released

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Summary of Contents for Quectel LG77L EVB

  • Page 1 LG77L EVB User Guide GNSS Module Series Version: 1.0 Date: 2021-03-23 Status: Released...
  • Page 2 To the maximum extent permitted by law, Quectel excludes all liability for any loss or damage suffered in connection with the use of the functions and features under development, regardless of whether such loss or damage may have been foreseeable.
  • Page 3 LG77L EVB User Guide Copyright The information contained here is proprietary technical information of Quectel. Transmitting, reproducing, disseminating and editing this document as well as using the content without permission is forbidden. Offenders will be held liable for payment of damages. All rights are reserved in the event of a patent grant or registration of a utility model or design.

  • 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 LG77L module. Manufacturers of the terminal should send the following safety information to users and operating personnel, and incorporate these guidelines into all manuals supplied with the product.

  • Page 5: About The Document

    GNSS Module Series LG77L EVB User Guide About the Document Document Information Title LG77L EVB User Guide Subtitle GNSS Module Series Document Type EVB User Guide Document Status Released Revision History Version Date Description 2021-03-23 Creation of the document 2021-03-23...

  • Page 6: Table Of Contents

    GNSS Module Series LG77L EVB User Guide 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 Accessories ........................9 2.2.
  • Page 7 GNSS Module Series LG77L EVB User Guide Table Index Table 1: List of Accessories ........................10 Table 2: Detailed EVB Interfaces ....................... 12 Table 3: J401 Pin Detailed Description ...................... 13 Table 4: PowerGPS Interface Explained ....................16 Table 5: Related Document ........................27 Table 6: Terms and Abbreviations ......................
  • Page 8 GNSS Module Series LG77L EVB User Guide Figure Index Figure 1: EVB Kit Accessories ........................9 Figure 2: EVB and Accessories Assembly ....................10 Figure 3: EVB Top View ..........................11 Figure 4: USB Ports ........................... 14 Figure 5: COM Port Setting Interface of QCOM ..................14 Figure 6: PowerGPS Main Interface (Not Connected) ................

  • Page 9: Introduction

    LG77L EVB User Guide Introduction This document provides information on how to develop and test the Quectel LG77L module using the Evaluation Board (EVB). The EVB is a convenient tool that allows you to become familiar with the LG77L module.

  • Page 10: General Overview

    GNSS Module Series LG77L EVB User Guide General Overview 2.1. EVB Kit Accessories The EVB Kit includes: Evaluation Board (EVB), Active GNSS Antenna, Micro-USB Cable, USB Flash Drive, Bolts and Coupling Nuts. The software tools are placed in the USB flash drive.

  • Page 11: Connecting Cables And Antenna To Evb

    GNSS Module Series LG77L EVB User Guide Table 1: List of Accessories Items Description Quantity Evaluation Board Size: 60 mm × 70 mm USB Cable Micro-USB Cable Active GNSS Antenna GNSS Antenna Request the Antenna Datasheet from your local FAE.

  • Page 12: Board User Interfaces

    GNSS Module Series LG77L EVB User Guide Board User Interfaces 3.1. EVB Top View The EVB includes: LG77L Module (U101), Antenna Connector (J301), Power Switch (S201), Micro-USB Connector (J102), FORCE_ON Button (S402), RESET_N Button (S401), Indication LEDs (D402, D403), Test Points (J401).
  • Page 13 GNSS Module Series LG77L EVB User Guide Table 2: Detailed EVB Interfaces Interfaces Function Description Power supply input: J102  Power Supply DC power supply: 4.5–5.5 V, typ. 5.0 V Micro-USB  Current capability should be >100 mA J102 User Interface...
  • Page 14 GNSS Module Series LG77L EVB User Guide Table 3: J401 Pin Detailed Description Pin Name Description Transmits data Receives data RESET_N Resets the module FORCE_ON Wakes up the module from backup mode ANT_DET Detects active antenna open-circuit Ground JAM_DET Detects jamming signal...

  • Page 15: Using Qcom Tool To Communicate

    Step 4: View the USB port numbers in the Device Manager, as shown in Figure 4 below. Figure 4: USB Ports Step 5: Install the QCOM tool provided by Quectel. The COM Port Setting interface of QCOM is shown in Figure 5 below.

  • Page 16: Using Powergps Tool To Test

    GNSS Module Series LG77L EVB User Guide Using PowerGPS Tool to Test This chapter explains how to use the PowerGPS tool for checking the status of GNSS receivers, when you are working with the EVB. Find the PowerGPS tool on the USB flash drive in the EVB Kit, or request it from your local FAE.

  • Page 17: Interface Explained

    GNSS Module Series LG77L EVB User Guide “Create Connection” button. The interface shown in the figure below appears Step 4: Click the when the module is connected. Figure 7: PowerGPS Interface (Connected) 5.1.1. Interface Explained You can view GNSS information, such as CNR message, time, position, speed and precision in the PowerGPS interface.

  • Page 18: Pmtk Command Sending

    GNSS Module Series LG77L EVB User Guide  PRN G28 carrier-to-noise ratio (CNR) is 49 dB/Hz.  G stands for a GPS satellite, B for a BeiDou satellite, and S for an SBAS satellite.  Light blue column means that the navigation data of the satellite is in use.

  • Page 19: Automatic Ttff Testing

    GNSS Module Series LG77L EVB User Guide Figure 8: PMTK Command Sending via PowerGPS 5.3. Automatic TTFF Testing The PowerGPS tool allows users to measure TTFF (Time to First Fix) under the following testing conditions:  Full cold start, ...
  • Page 20 GNSS Module Series LG77L EVB User Guide Figure 9: Disable These Options Step 2: Click “MTK” menu and click “Static TTFF Testing” to enter “Automatic TTFF Testing” as shown in the figure below. Figure 10: Static TTFF Testing via PowerGPS...
  • Page 21 GNSS Module Series LG77L EVB User Guide Step 3: Click “Set Reference Point” to open the “Options” window as shown in the figure below and select “Reference Location” tab. Figure 11: Select Reference Location Step 4: Click on the “Use Mean Position” button as shown in the figure below, and click “OK”.
  • Page 22 GNSS Module Series LG77L EVB User Guide Figure 13: Click Configuration Step 6: Set the “TTFF Time- out (sec)” as shown in the figure below and click “OK”. If you select hot start, it is recommended to set the “TTFF Time-out (sec)” to 10 s. If you select warm start, you can set the “TTFF Time-out (sec)”...
  • Page 23 GNSS Module Series LG77L EVB User Guide Step 7: Click on the “Run” button to start the test. OR Click on the “Stop” button to stop the test. Figure 15: Click Run/Stop Button Step 8: View the test results displayed visually in charts. The test results are stored in the directory where the tool is installed.

  • Page 24: Firmware Upgrade

    Second: Flip the power switch (S201) to ON position to power on the EVB. Firmware upgrade steps: Step 1: Select the “Settings”, click “COM port”, and select the port of LG77L EVB USB as shown in the figure below. Figure 16: Firmware Upgrade – Step 1...
  • Page 25 GNSS Module Series LG77L EVB User Guide Step 2: Select the “Settings”, click “Baud rate” and select “460800” as shown in the figure below. Figure 17: Firmware Upgrade – Step 2 Step 3: Left double-click “ROM” and select firmware, e.g. “LG77LNR01A02SV02.bin” as shown in the figure below.
  • Page 26 GNSS Module Series LG77L EVB User Guide Step 5: Click the “Download” button to upgrade the firmware. Figure 19: Firmware Upgrade – Step 4 and 5 Step 6: Click the “Go!” button to confirm as shown in the figure below.
  • Page 27 GNSS Module Series LG77L EVB User Guide Figure 21: Successful Firmware Upgrade LG77L_EVB_User_Guide 26 / 28...

  • Page 28: Appendix A Reference

    GNSS Module Series LG77L EVB User Guide Appendix A Reference Table 5: Related Document Document Name Description [ 1 ] Quectel_QCOM_User_Guide QCOM User Guide Table 6: Terms and Abbreviations Abbreviation Description 2 Dimension 3 Dimension BeiDou BeiDou Navigation Satellite System...
  • Page 29 GNSS Module Series LG77L EVB User Guide Low-Noise Amplifier Micro-USB Micro Universal Serial Bus NMEA NMEA (National Marine Electronics Association) 0183 Interface Standard Personal Computer Power Input PMTK MTK Proprietary Protocol Power Output Pulse Per Second Pseudorandom Noise Receive Data (Pin)

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