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Summary of Contents for Quectel LG77L EVB
- Page 1 LG77L EVB User Guide GNSS Module Series Version: 1.0.0 Date: 2020-12-03 Status: Preliminary www.quectel.com...
- 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 Wireless Solutions Co., Ltd. Transmitting, reproducing, disseminating and editing this document as well as using the content without permission are 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.
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Page 4: About The Document
GNSS Module Series LG77L EVB User Guide About the document Revision History Version Date Author Description 2020-12-03 Wind ZHAO Creation of the document 1.0.0 2020-12-03 Wind ZHAO Preliminary LG77L_EVB_User_Guide 3 / 27... -
Page 5: Table Of Contents
GNSS Module Series LG77L EVB User Guide Contents About the document ........................... 3 Contents ............................... 4 Table Index ..............................5 Figure Index ..............................6 Introduction ............................7 1.1. Safety Information ........................7 General Overview ..........................8 2.1. Top and Bottom Views ........................ 8 2.2. - Page 6 LG77L EVB User Guide Table Index Table 1: Interfaces of LG77L EVB ........................ 8 Table 2: Key Features of LG77L EVB ......................9 Table 3: List of Accessories ........................10 Table 4: LG77L Switches and Buttons ....................... 13 Table 5: Operation Status Indication LEDs ....................13 Table 6: Pin Description of J106 ........................
- Page 7 Figure 5: LG77L EVB Switches and Buttons ..................... 12 Figure 6: Operation Status Indication LEDs ....................13 Figure 7: LG77L EVB Test Points - J106 ....................14 Figure 8: LG77L EVB and Accessories Assembly ..................15 Figure 9: USB Ports ........................... 16 Figure 10: COM Port Setting Interface of QCOM ..................
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Page 8: Introduction
GNSS Module Series LG77L EVB User Guide Introduction This document defines and specifies the usage of LG77L EVB (Evaluation Board) which is an assistant tool for engineers to develop and test Quectel LG77L module. 1.1. Safety Information The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any cellular terminal or mobile incorporating LG77L. -
Page 9: General Overview
GNSS Module Series LG77L EVB User Guide General Overview 2.1. Top and Bottom Views The following figure shows the top view of LG77L EVB. Figure 1 : Top View of LG77L EVB Table 1: Interfaces of LG77L EVB Reference Number... -
Page 10: Key Features
Indication LEDs J301 Antenna interface U101 LG77L module 2.2. Key Features The following table describes the detailed features of LG77L EVB. Table 2: Key Features of LG77L EVB Features Implementation Power Supply DC power supply (J201): 4.5–5.5 V, typically: 5.0 V... -
Page 11: Evb Kit Accessories
GNSS Module Series LG77L EVB User Guide 2.3. EVB Kit Accessories USB Flash Drive USB Cable GNSS Antenna Bolts and Coupling Nuts Figure 2: EVB Kit Accessories Table 3: List of Accessories Items Description Quantity LG77L EVB USB Cable USB cable... -
Page 12: Application Interfaces
GNSS Module Series LG77L EVB User Guide Application Interfaces 3.1. Micro-USB Interface The main power is supplied via a Micro-USB interface. Micro-USB interfaces can be used for data communication. So, it is strongly recommended to use the Micro-USB interface for both power supply and NEMA sentence output, during which only a USB cable is needed. -
Page 13: Switches And Buttons
LG77L EVB User Guide Antenna Interface Figure 4: LG77L EVB Antenna Interface 3.3. Switches and Buttons The following illustrates the switches and buttons of the EVB. S402 J102 S401 Figure 5: LG77L EVB Switches and Buttons LG77L_EVB_User_Guide 12 / 27... -
Page 14: Operation Status Indication Leds
GNSS Module Series LG77L EVB User Guide Table 4: LG77L Switches and Buttons Part No. Name Description S201 POWER Switch Control power supply connect and disconnect Press and then release the button, the module S401 RESET button will be reset. -
Page 15: Test Points
GNSS Module Series LG77L EVB User Guide 3.5. Test Points The following illustrates the test points of the EVB. Figure 7: LG77L EVB Test Points - J106 Table 6: Pin Description of J106 Pin No. Signal Description Transmit data Receive data... -
Page 16: Evb And Accessories Assembly
GNSS Module Series LG77L EVB User Guide EVB and Accessories Assembly The following figure shows the assembly of LG77L EVB and its accessories. Figure 8: LG77L EVB and Accessories Assembly LG77L_EVB_User_Guide 15 / 27... -
Page 17: Evb Operation Procedures
PC Device Manager, shown as below. Figure 9: USB Ports Step 3: Install and then use the QCOM tool provided by Quectel to realize the communication between the LG77L module and the PC. The following figure shows the COM Port Setting interface of QCOM: select the correct “COM Port”... -
Page 18: Firmware Upgrade
LG77L EVB User Guide 5.2. Firmware Upgrade Quectel LG77L module upgrades firmware via USB interface by default. Please follow the procedures below to upgrade the firmware. Step 1: Install and open the firmware upgrade tool (Firebird Update FW Tool) on PC. -
Page 19: Usage Of Powergps
GNSS Module Series LG77L EVB User Guide Usage of PowerGPS 6.1. PowerGPS Interface 6.1.1. COM Port and Baud Rate Setting The PowerGPS tool can help you view the status of GNSS receiver conveniently. After EVB accessories are assembled, turn on the module and start up the PowerGPS. After the tool is... -
Page 20: Explanations Of Powergps Interface
GNSS Module Series LG77L EVB User Guide Figure 13: COM Port and Baud Rate Selection PowerGPS main Interface (connect) 6.1.2. Explanations of PowerGPS Interface From the PowerGPS interface, users can view CNR message, time, position, speed, precision, and so on. -
Page 21: Command Sending
GNSS Module Series LG77L EVB User Guide ⚫ The CNR of SV with PRN is 42 dB/Hz. ⚫ White column means the navigation data of this satellite is not in use. ⚫ UTC time ⚫ Latitude degree ⚫ Longitude degree ⚫... -
Page 22: Ttff Testing
GNSS Module Series LG77L EVB User Guide Figure 14: Command Sending via PowerGPS 6.3. TTFF Testing The uSTAR tool allows customers to measure the TTFF (Time To First Fix) under different testing conditions. The TTFF can be tested under cold start, warm start or hot start conditions. And the number of tests can be 1, 10, 20, 100, 1000, and 10000. - Page 23 GNSS Module Series LG77L EVB User Guide 启动类型 测试次数 Figure 15：Testing static TTFF Via uSTAR Step 2：Click “Set Reference Point” option interface will be shown as bellow, and then click “Reference Location”. LG77L_EVB_User_Guide 22 / 27...
- Page 24 GNSS Module Series LG77L EVB User Guide Figure 16：Reference Location Button Then interface shown as bellow, click “Use Mean Position” and “OK”. Figure 17：Use Mean Position Button LG77L_EVB_User_Guide 23 / 27...
- Page 25 GNSS Module Series LG77L EVB User Guide Step 3：Return to interface as bellow, click “Config” enter TTFF configuration interface.Configurating “TTFF Time-out (sec)” and click “OK”. Figure 18：Config Button LG77L_EVB_User_Guide 24 / 27...
- Page 26 GNSS Module Series LG77L EVB User Guide Figure 19：Configurating TTFF Time-out (Sec) If testing hot start, it is generally recommended to set "TTFF time-out (SEC)" to 10s; If testing warm start, it can be set to 50S; If the cold start is selected, it is recommended to set it to 100S. The value of the "TTFF time-out (SEC)"...
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Page 27: Appendix A References
GNSS Module Series LG77L EVB User Guide Appendix A References Table 8: Related Documents Document Name Remark [ 1 ] Quectel_QCOM_User_Guide QCOM User Guide Table 9: Terms and Abbreviations Abbreviation Description Carrier-to-Noise Ratio Digital Input Digital Output Evaluation Board GNSS... - Page 28 GNSS Module Series LG77L EVB User Guide Universal Time Coordinated WGS84 World Geodetic System 1984 LG77L_EVB_User_Guide 27 / 27...
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