Quectel LC76F User manual

LC76F EVB User Guide
GNSS Module Series
Version: 1.0
Date: 2022-06-23
Status: Released

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Copyright © Quectel Wireless Solutions Co., Ltd. 2022. All rights reserved.

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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 LC76F 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. Otherwise, Quectel assumes no liability for customers’ failure to comply
with these precautions.
Ensure that the product may be used in the country and the required environment,
as well as that it conforms to the local safety and environmental regulations.
Keep away from explosive and flammable materials. The use of electronic products
in extreme power supply conditions and locations with potentially explosive
atmospheres may cause fire and explosion accidents.
The product must be powered by a stable voltage source, while the wiring must
conform to security precautions and fire prevention regulations.
Proper ESD handling procedures must be followed throughout the mounting,
handling and operation of any devices and equipment that incorporate the module
to avoid ESD damages.

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About the Document
Revision History
Document Information
Title
LC76F EVB User Guide
Subtitle
GNSS Module Series
Document Type
EVB User Guide
Document Status
Released
Version
Date
Description
-
2021-07-21
Creation of the document
1.0
2022-06-23
First official release

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Contents
Safety Information...................................................................................................................................... 3
About the Document.................................................................................................................................. 4
Contents...................................................................................................................................................... 5
Table Index.................................................................................................................................................. 6
Figure Index................................................................................................................................................ 7
1Introduction......................................................................................................................................... 8
1.1. Special Marks............................................................................................................................. 8
2General Overview................................................................................................................................ 9
2.1. EVB Kit....................................................................................................................................... 9
2.2. Connecting Cables and Antenna to EVB................................................................................. 10
3EVB Interfaces................................................................................................................................... 12
3.1. EVB Top View........................................................................................................................... 12
3.2. EVB Interfaces ......................................................................................................................... 13
4Communication via QCOM Tool...................................................................................................... 15
4.1. Communication via the Micro-USB Interface........................................................................... 15
5Test via QGNSS Tool........................................................................................................................ 17
5.1. QGNSS Setting........................................................................................................................ 17
5.1.1. QGNSS Interface Explanation ...................................................................................... 19
6Firmware Upgrade via QGPSFlashTool.......................................................................................... 21
6.1. Firmware Upgrade ................................................................................................................... 21
7Appendix References....................................................................................................................... 25

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Table Index
Table 1: Special Marks ................................................................................................................................. 8
Table 2: List of Kit Components ................................................................................................................. 10
Table 3: Detailed EVB Interfaces ...............................................................................................................13
Table 4: J106 Pin Assignment....................................................................................................................13
Table 5: J106 Pin Detailed Description ...................................................................................................... 14
Table 6: QGNSS Interface Explanation......................................................................................................19
Table 7: Related Documents......................................................................................................................25
Table 8: Terms and Abbreviations ..............................................................................................................25

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Figure Index
Figure 1: EVB and Components .................................................................................................................. 9
Figure 2: EVB and Components Assembly................................................................................................10
Figure 3: EVB Top View ............................................................................................................................. 12
Figure 4: USB Port ..................................................................................................................................... 15
Figure 5: COM Port Setting Interface of QCOM ........................................................................................15
Figure 6: NMEA Messages Output – Displayed on QCOM Tool Interface ................................................ 16
Figure 7: QCOM Port and Baud Rate Setting............................................................................................ 18
Figure 8: QGNSS Interface (Connected)...................................................................................................18
Figure 9: Firmware Upgrade –Step 1........................................................................................................22
Figure 10: Firmware Upgrade – Step 2......................................................................................................22
Figure 11: Firmware Upgrade – Step 3......................................................................................................23
Figure 12: Firmware Upgrade – Step 4......................................................................................................23
Figure 13: Successful Firmware Upgrade ................................................................................................. 24

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1Introduction
This document provides information on the steps needed to evaluate the Quectel LC76F module using the
Evaluation Board (EVB). The EVB is a convenient tool that allows you to become familiar with the LC76F
module.
Specifically, the document is divided into several sections:
⚫Chapter 2 provides the general overview of EVB Kit.
⚫Chapter 3 describes the EVB user interfaces.
⚫Chapter 4 describes how to communicate with a module via QCOM tool.
⚫Chapter 5 describes how to test the module via QGNSS tool.
⚫Chapter 6 describes how to upgrade the module firmware via QGPSFlashTool.
⚫Chapter 7 is an appendix, which summarizes the relevant documents, terms and abbreviations
appearing herein.
1.1. Special Marks
Table 1: Special Marks
⚫
For EVB schematic and PCB layout design files, contact Quectel Technical Support
([e-mail]).
Mark
Definition
*
Unless otherwise specified, when an asterisk (*) is used after a function, feature, interface,
pin name, or argument, it indicates that the function, feature, interface, pin, or argument is
under development and currently not supported; and the asterisk (*) after a model indicates
that the sample of the model is currently unavailable.
NOTE

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2General Overview
2.1. EVB Kit
The EVB Kit includes: Evaluation Board (EVB), Active GNSS Antenna, Micro-USB Cable, USB flash drive,
Bolts and Coupling Nuts. Download the software tools (QCOM, QGNSS, QGPSFlashTool) from our
website Download Zone or request them from Quectel Technical Support.
The EVB Kit components are shown in the figure below, and check Table 1 for details.
Bolts and coupling nuts
Micro-USB cable
USB Flash Drive
Active GNSS antenna
EVB
Figure 1: EVB and Components

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Table 2: List of Kit Components
2.2. Connecting Cables and Antenna to EVB
The connection between the EVB and its accessories is shown in the figure below. For detailed information
on how to connect the EVB and its accessories, refer to the instruction sheet inside the EVB Kit.
Figure 2: EVB and Components Assembly
Items
Description
Quantity
EVB
Evaluation Board
Size: 60 mm ×70 mm
1
USB Cable
Micro-USB Cable
1
USB Flash Drive
8 GB USB Flash Drive (including the module-related
documents, tools and drivers)
1
GNSS Antenna
Active GNSS Antenna
Request the Antenna Datasheet from Quectel Technical
Support.
1
Instruction Sheet
Sheet providing instructions on how to connect the EVB
and its components, detailed information on EVB
contents, etc.
1
Other
Bolts and Coupling Nuts
4 pairs

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⚫
Make sure that the Active GNSS Antenna is placed with a clear line of sight to the sky.
NOTE

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3EVB Interfaces
3.1. EVB Top View
EVB top view is shown in the figure below.
D101
1PPS and TXD
Indication LEDs
U101
LC76F module J106
Test points
J101
Antenna connector
J201
Micro-USB connector
S201
Power switch
Z101
RESET_N button
S301
UART↔USB switch
Figure 3: EVB Top View

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3.2. EVB Interfaces
The EVB interfaces are detailed in the table below.
Table 3: Detailed EVB Interfaces
Test point distribution is shown below:
Table 4: J106 Pin Assignment
32K/DRIN
AADET_N
1PPS
STANDBY
GND
TIMER
RESET_N
TXD1
RXD1
GND
Function
Interfaces
Description
Power Supply
J201
Micro-USB
Power supply input:
⚫DC power supply: 4.5–5.5 V, typ. 5.0 V
⚫Current capability should be > 100 mA
Communication
Interface
J201
Micro-USB
Standard NMEA messages output, PGKC
commands input/output, and firmware
upgrade.
RF Input
J101
Antenna Connector
The antenna in the Kit supports:
⚫GPS L1 C/A
⚫GLONASS L1
⚫Galileo*E1
⚫QZSS L1 C/A
⚫SBAS L1
Signal Indication
D101
Indication LEDS
TXD
(Blue LED)
Flashing: Data output from UART TXD pin.
Extinct or Bright: No data output from UART
TXD.
1PPS
(Red LED)
Flashing: Successful position fix.
The frequency is 1 Hz.
Extinct: No position fix.
Switches and Buttons
S201
Power Switch
Power the EVB on/off.
S301
UART↔USB Switch
Switch between USB data transfer and
UART data transfer features.
Z101
RESET_N Button
Short press on the button to reset the
module.
Test Points
J106
Test Points
Pins are detailed in Table 4 and Table 5
below.

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Table 5: J106 Pin Detailed Description
Pin Name
I/O
Description
32K/DRIN
-
NC
AADET_N
-
NC
1PPS
DO
1 pulse per second
STANDBY
-
NC
GND
-
Ground
TIMER
-
NC
RESET_N
DI
Resets the module
TXD
DO
Transmits data
RXD
DI
Receives the data
GND
-
Ground

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4Communication via QCOM Tool
This chapter expliains how to use the QCOM tool to communicate with the module via the Micro-USB
interface. For more information, see document [1].
Download the QCOM tool from our website Download Zone or request it from Quectel Technical Support.
4.1. Communication via the Micro-USB Interface
Step 1: Connect the EVB and the PC with a Micro-USB cable via the Micro-USB interface.
Step 2: Flip the power switch (S201) to ON position to power on the EVB and flip the UART↔USB switch
(S301) to USB position.
Step 3: Run the provided driver installer to install the USB driver.
Step 4: View the USB port numbers in the Device Manager, as shown in Figure 4 below.
Figure 4: USB Port
Step 5: Install the QCOM tool provided by Quectel. The COM Port Setting interface of QCOM is shown
in Figure 5 below. (Default baud rate: 9600 bps
1
).
Figure 5: COM Port Setting Interface of QCOM
1
UART interface default settings may vary depending on software versions.

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Step 6: Select the correct “COM Port” (USB Port shown in Figure 4 above).
Step 7: Set the correct “Baudrate”.
Step 8: Click “Open Port” to establish communication with the EVB. The NMEA messages output by the
module will be displayed in the receiving bar of the QCOM tool, as shown in the figure below.
Figure 6: NMEA Messages Output –Displayed on QCOM Tool Interface

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5Test via QGNSS Tool
This chapter explains how to use the QGNSS tool for verifying the status of GNSS module. For more
information about QGNSS usage, see document [2].
Download the QGNSS tool from our website Download Zone or request it from Quectel Technical Support.
5.1. QGNSS Setting
Step 1: Assemble the EVB components.
Step 2: Flip the power switch (S201) to ON position to power on the EVB and flip the UART↔USB switch
(S301) to USB position.
Step 3: Start the QGNSS and click “Setting” and “Serial Port Configuration” (default baud rate
9600 bps
2
), as shown in the figure below.
2
UART interface default settings may vary depending on software versions.

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Figure 7: QCOM Port and Baud Rate Setting
Step 4: Click the “Connect or disconnect”button. The interface shown in the figure below
appears once the module is connected.
Figure 8: QGNSS Interface (Connected)

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5.1.1. QGNSS Interface Explanation
You can view GNSS information, such as C/N0 message, time, position, speed, and precision in the
QGNSS interface. See the following table to find out more about these parameters.
Table 6: QGNSS Interface Explanation
Icon
Explanation
The sky view interface shows the position of the satellites in use.
1) The left column icons show the satellites in use and their
number.
⚫BDS: 0
⚫GLO (GLONASS): 7
⚫GPS: 8
⚫GAL (Galileo): 0
⚫QZSS: 0
⚫NavIC (IRNSS): 0
⚫SBAS: 0
2) The grid map on the right shows the position of the satellites
in use.
GPS satellite
BDS satellite
GLONASS satellite
Galileo satellite
QZSS satellite
NavIC (IRNSS) satellite
⚫PRN 8 C/N0 is 22 dB-Hz.
⚫Column in bright red means that the navigation data of the
satellites are in use.
⚫PRN 6 C/N0 is 21 dB-Hz.
⚫Column in light red means that the navigation data of the
satellites are not in use.