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GNSS Module Series

L76C EVB User Guide

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Appendix A Reference

Table 8: Terms and Abbreviations

Abbreviation

Description

CNR

Carrier-to-Noise Ratio

Digital Input

Digital Output

EVB

Evaluation Board

GNSS

Global Navigation Satellite System

GPS

Global Positioning System

Bidirectional

LED

Light Emitting Diode

LNA

Low Noise Amplifier

Power Input

PPS

Pulse Per Second

PRN

Pseudorandom Noise

Satellite Vehicle

TTFF

Time To First Fix

UTC

Universal Time Coordinated

WGS84

World Geodetic System 1984

Summary of Contents for L76C

Page 1: ...L76C EVB User Guide GNSS Module Series Rev L76C_EVB_User_Guide_V1 0 Date 2018 08 29 Status Released www quectel com ...

Page 2: ...ROVIDED IS BASED UPON CUSTOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR...

Page 3: ...GNSS Module Series L76C EVB User Guide L76C_EVB_User_Guide 2 26 About the document History Revision Date Author Description 1 0 2018 08 29 Brooke WANG Gobber HU Initial ...

Page 4: ...tions 12 3 1 Micro USB Interface 12 3 2 SD Card Interface 13 3 3 Antenna Interface 13 3 4 Switches and Buttons 14 3 5 Operation Status Indication LEDs 15 3 6 Test Points 16 4 EVB and Accessories Assembly 17 5 EVB Operation Procedures 18 5 1 Communication via USB Interface 18 5 2 Firmware Upgrade 19 6 Usage of uSTAR 20 6 1 uSTAR Interface 20 6 1 1 COM Port and Baud Rate Setting 20 6 1 2 Explanation...

Page 5: ...INTERFACES OF L76C EVB 9 TABLE 2 KEY FEATURES OF L76C EVB 10 TABLE 3 LIST OF ACCESSORIES 11 TABLE 4 L76C SWITCHES AND BUTTONS 15 TABLE 5 OPERATION STATUS INDICATION LEDS 15 TABLE 6 PIN DESCRIPTION OF J106 16 TABLE 7 EXPLANATIONS OF USTAR INTERFACE 21 TABLE 8 TERMS AND ABBREVIATIONS 26 ...

Page 6: ... 15 FIGURE 9 L76C EVB TEST POINTS J106 16 FIGURE 10 L76C EVB AND ACCESSORIES ASSEMBLY 17 FIGURE 11 USB PORTS 18 FIGURE 12 COM PORT SETTING INTERFACE OF QCOM 18 FIGURE 13 FIREBIRD UPDATE FW TOOL CONFIGURATIONS FOR FIRMWARE UPGRADE 19 FIGURE 14 USTAR TOOL INTERFACE 20 FIGURE 15 COM PORT AND BAUD RATE SELECTION 21 FIGURE 16 COMMAND SENDING VIA USTAR 23 FIGURE 17 STATIC TTFF TESTING VIA USTAR 24 FIGUR...

Page 7: ...es L76C EVB User Guide L76C_EVB_User_Guide 6 26 1 Introduction This document defines and specifies the usage of L76C EVB Evaluation Board which is an assistant tool for engineers to develop and test Quectel L76C module ...

Page 8: ...lt the airline staff for more restrictions on the use of wireless devices on boarding the aircraft Wireless devices may cause interference on sensitive medical equipment so please be aware of the restrictions on the use of wireless devices when in hospitals clinics or other healthcare facilities Cellular terminals or mobiles operating over radio signals and cellular network cannot be guaranteed to...

Page 9: ...ule Series L76C EVB User Guide L76C_EVB_User_Guide 8 26 2 General Overview 2 1 Top and Bottom Views The following illustrate the top and bottom views of L76C EVB B C D E F G H I J Figure 1 Top View of L76C EVB ...

Page 10: ...le 1 Interfaces of L76C EVB SN Reference Number Description A J303 SD card interface B S301 USB SD serial port alternation switch C S102 RESET button D S103 Reserved E S201 POWER switch F J201 Micro USB interface G D105 D106 Indication LEDs H J101 Antenna interface I U101 L76C module J J106 Test points ...

Page 11: ...e Bolts and Coupling Nuts Figure 3 EVB Kit Accessories Features Implementation Power Supply DC power supply J201 4 5V 5 5V typically 5 0V SD Card Interface SD card for NEMA output data storage Micro USB Interface Power supply and NEMA sentence output Signal Indication 2 LEDs are available for signal indication Switches and Buttons POWER Switch S201 RESET S102 USB SD serial port alternation switch ...

Page 12: ...Items Description Quantity EVB L76C EVB 1 Cable USB cable 1 Antenna Active GNSS antenna 1 USB Flash Drive GNSS_EVB_Micro USB_Driver_CP210x 1 Instruction Sheet A sheet of paper giving instructions for EVB connection details of EVB accessories etc 1 Others Bolts and coupling nuts 4 for each type ...

Page 13: ...communication and they can be switched to each other by the alternation switch S301 If SD card interface is used for data communication NMEA sentence output then both SD card and Micro USB cables are necessary for operating the EVB 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 Micro USB Interface ...

Page 14: ...output data The memory storage capacity of supported SD card should be no more than 32GB Figure 5 SD Card Interface 3 3 Antenna Interface The L76C module can be connected to a dedicated passive or active GNSS antenna and it has a built in LNA to improve sensitivity The antenna interface is used for connection with an external antenna ...

Page 15: ...B User Guide L76C_EVB_User_Guide 14 26 Antenna Figure 6 L76C EVB Antenna Interface 3 4 Switches and Buttons The following illustrates the switches and buttons of the EVB S301 S201 S102 S103 Figure 7 L76C EVB Switches and Buttons ...

Page 16: ...l be reset S103 Reserved S201 POWER PI Control power supply via Micro USB interface S301 USB SD serial port alternation switch IO L76C EVB supports data communication via both Micro USB and SD card interfaces which are controlled and switched by the S301 switch Part Name I O Description D105 TXD DO Flash the module is turned on successfully and either Micro USB or SD card interface can be used to ...

Page 17: ...the test points of the EVB 1 2 3 4 5 6 7 8 9 10 Figure 9 L76C EVB Test Points J106 Table 6 Pin Description of J106 Pin No Signal I O Description 1 10 GND Ground 2 NC Reserved 3 1PPS DO 1 pulse per second 4 NC Reserved 5 NC Reserved 6 NC Reserved 7 RESET DI System reset 8 TXD1 DO Transmit data 9 RXD1 DI Receive data ...

Page 18: ...Module Series L76C EVB User Guide L76C_EVB_User_Guide 17 26 4 EVB and Accessories Assembly The following figure shows the assembly of L76C EVB and its accessories Figure 10 L76C EVB and Accessories Assembly ...

Page 19: ...n PC to install the USB driver The USB port numbers can be viewed through the PC Device Manager shown as below Figure 11 USB Ports Step 3 Install and then use the QCOM tool provided by Quectel to realize the communication between the L76C module and the PC The following figure shows the COM Port Setting interface of QCOM select the correct COM Port USB Port shown in the above figure and set the co...

Page 20: ... open the firmware upgrade tool Firebird Update FW Tool on PC Step 2 Power on the EVB according to the procedures mentioned in step 1 of Chapter 5 1 Step 3 Follow the steps below to start firmware upgrade a Select the COM port b Choose the firmware package c Click the Baud rate dropdown list and select 9600 d Click the START button to upgrade the firmware a b c d Figure 13 Firebird Update FW Tool ...

Page 21: ...terface 6 1 1 COM Port and Baud Rate Setting The uSTAR tool can help users to view the status of GNSS receiver conveniently After EVB accessories are assembled turn on the module and start up the uSTAR After the tool is opened the following interface will be shown Figure 14 uSTAR Tool Interface ...

Page 22: ...n speed precision and so on Explanations are listed in the table below Table 7 Explanations of uSTAR Interface Icon Explanation SV with PRN 17 and 165 If the position of SV is near to the centre of the Sky View the elevation angle of SV is close to 90 Green or dark green means this satellite is in tracking Fuchsia means this satellite is not in tracking The CNR of PRN 30 is 52dB Hz Green column me...

Page 23: ...nt by uSTAR The command input box is shown as below means under development The CNR of PRN 9 is 19dB Hz White column means the navigation data of this satellite is not in use Longitude degree Latitude degree Altitude based on WGS84 datum UTC time The number of satellites being used Speed of receiver CPU Trajectory NOTE ...

Page 24: ...me To First Fix under different testing conditions The TTFF can be tested under cold start warm start or hot start conditions Click the Start button to start the test and it can be stopped by clicking the Cancel button The following are the detailed configuration steps during TTFF testing Step 1 Start Tool menu and then click TTFF to enter the interface shown as below ...

Page 25: ...User_Guide 24 26 Figure 17 Static TTFF Testing via uSTAR Step 2 For cold start TTFF testing Please click the dropdown list after Reset Mode field to choose Cold Start and then click Start as shown below Figure 18 Cold Start TTFF Testing Configuration ...

Page 26: ...eld to choose Hot Start and then click Start as shown below Figure 19 Hot Start TTFF Testing Configuration Options For warm start TTFF testing Please click the dropdown list after Reset Mode field to choose Self Define then input command RESET 0 h01 and finally click Start as shown below Figure 20 Warm Start TTFF Testing Configuration Options ...

Page 27: ...e Ratio DI Digital Input DO Digital Output EVB Evaluation Board GNSS Global Navigation Satellite System GPS Global Positioning System IO Bidirectional LED Light Emitting Diode LNA Low Noise Amplifier PI Power Input PPS Pulse Per Second PRN Pseudorandom Noise SV Satellite Vehicle TTFF Time To First Fix UTC Universal Time Coordinated WGS84 World Geodetic System 1984 ...

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