Quectel L76 User Manual
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Quectel L76 User Manual

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L76
EVB User Guide
GNSS Module Series
Rev. L76_EVB_User_Guide_V1.1
Date: 2013-04-02
www.quectel.com

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Summary of Contents for Quectel L76

  • Page 1 EVB User Guide GNSS Module Series Rev. L76_EVB_User_Guide_V1.1 Date: 2013-04-02 www.quectel.com...
  • Page 2 QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED 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.

  • Page 3: About The Document

    GNSS Module L76 EVB User Guide About the document History Revision Date Author Description 2013-02-25 Dishon ZHOU Initial 2013-03-26 Dishon ZHOU Optimized the contents of Chapter 3. L76_EVB_User Guide Confidential / Released 2 / 25...

  • Page 4: Table Of Contents

    GNSS Module L76 EVB User Guide Contents About the document ........................... 2 Contents ............................... 3 Table Index ..............................4 Figure Index ..............................5 Introduction ............................6 Introduction to EVB Kit ........................7 2.1. EVB Top and Bottom View ......................7 2.2.
  • Page 5 GNSS Module L76 EVB User Guide Table Index TABLE 1: PINS OF UART PORT ........................11 TABLE 2: SWITCHES AND BUTTONS ......................13 TABLE 3: OPERATING STATUS LEDS ......................14 TABLE 4: PINS OF J106 ........................... 15 TABLE 5: EXPLANATIONS OF POWERGPS WINDOW .................. 20 TABLE 6: REFERENCE ............................
  • Page 6 GNSS Module L76 EVB User Guide Figure Index FIGURE 1: EVB TOP VIEW ..........................7 FIGURE 2: EVB BOTTOM VIEW ........................8 FIGURE 3: EVB ACCESSORIES ........................9 FIGURE 4: MICRO-USB INTERFACE ......................10 FIGURE 5: UART INTERFACE .......................... 11 FIGURE 6: ANTENNA INTERFACE ........................

  • Page 7: Introduction

    GNSS Module L76 EVB User Guide Introduction This document defines and specifies the usage of L76 EVB (Evaluation Board). You can get useful information about L76 EVB and GNSS demo tool from this document. L76_EVB_User Guide Confidential / Released 6 / 25...

  • Page 8: Introduction To Evb Kit

    GNSS Module L76 EVB User Guide Introduction to EVB Kit 2.1. EVB Top and Bottom View Figure 1 : EVB Top View L76_EVB_User Guide Confidential / Released 7 / 25...

  • Page 9: Evb Accessories

    GNSS Module L76 EVB User Guide Figure 2 : EVB Bottom View A: UART port B: Serial port alternation switch C: RESET button D: FORCE_ON button E: POWER switch Micro-USB port G: Indication LEDs H: Antenna interface L76 Module STANDBY switch K: Test points 2.2.

  • Page 10: Figure 3: Evb Accessories

    GNSS Module L76 EVB User Guide Figure 3: EVB Accessories A: USB cable B: GNSS active antenna (3.3V) L76_EVB_User Guide Confidential / Released 9 / 25...

  • Page 11: Interface Application

    GNSS Module L76 EVB User Guide Interface Application 3.1. USB Interface Figure 4: Micro-USB Interface The main power is supplied via Micro-USB interface. We provide two ways for data communication: Micro-USB and UART interface which are controlled by alternation switch (S2). Both of RS232 and Micro-USB cable are necessary, if you want to use UART to output NEMA.

  • Page 12: Uart Interface

    GNSS Module L76 EVB User Guide 3.2. UART Interface Figure 5: UART Interface Table 1: Pins of UART port Signal Description Receive data Transmit data L76_EVB_User Guide Confidential / Released 11 / 25...

  • Page 13: Antenna Interface

    GNSS Module L76 EVB User Guide 3.3. Antenna Interface Figure 6: Antenna Interface Figure 7 : LNA Layout L76_EVB_User Guide Confidential / Released 12 / 25...

  • Page 14: Switches And Buttons

    GNSS Module L76 EVB User Guide For choice of external antenna, both of active antenna and passive antenna can be selected. Please note the LNA is installed in the EVB by default, so you have to move C109 to R112 and R118 to R105, when you want to remove the LNA for test.

  • Page 15: Operating Status Leds

    GNSS Module L76 EVB User Guide mode in the opposite operation. Press and release the button, the module will be FORCE_ON waked up from backup mode. Press and release this button, then the module RESET will reset. 3.5. Operating Status LEDs...

  • Page 16: Test Points

    GNSS Module L76 EVB User Guide 3.6. Test Points Figure 10: Test Points J106 Table 4: Pins of J106 Signal Description 32K/DRIN Reserved AADET_N Active antenna open circuit detection 1PPS 1 pulse per second STANDBY Enter or exit standby mode...
  • Page 17 GNSS Module L76 EVB User Guide 5/10 Ground Logic high will force module to be waked up from backup mode. Keep this pin open FORCE_ON or pulled low before entering into backup mode. If unused, keep this pin open. RESET...

  • Page 18: Evb And Accessories

    GNSS Module L76 EVB User Guide EVB and Accessories The EVB and its accessories are equipped as shown in Figure 11. Figure 11: EVB and Accessory Equipments L76_EVB_User Guide Confidential / Released 17 / 25...

  • Page 19: Install Device Driver

    GNSS Module L76 EVB User Guide Install Device Driver Please note that you need to install the driver of Micro-USB, when use Micro-USB for data communication. The driver has been stored in our FTP server. The driver of CP210x also can be download from internet.

  • Page 20: Starting Powergps

    Figure 12: PowerGPS Tool After EVB accessories are assembled, turn on the module and start up the PowerGPS. Select a correct COM port and baud rate (L76 module supports 9600bps by default), then click the button “Create Connection”. From the PowerGPS window, user can view CNR message, time, position, speed, precision and so on.

  • Page 21: Table 5: Explanations Of Powergps Window

    GNSS Module L76 EVB User Guide Table 5: Explanations of PowerGPS Window Icon Explanation SV with PRN 65. If the position of SV is near to the centre of the Sky View, the elevation angle of SV is close to 90° . Dark blue means this satellite is in tracking.

  • Page 22: Figure 13: Mtk Command

    GNSS Module L76 EVB User Guide PMTK Command You can send PMTK command by PowerGPS. The format of PMTK command includes only characters between „$‟ and „*‟, for example: PMTK869,0. Figure 13: MTK Command Automatic TTFF Testing This tool allows you to measure the TTFF (Time to First Fix) under different testing conditions. You can choose to test the TTFF from full start, cold start, warm start and hot start and the number of tests can be chosen from 1, 10, 20, 100, 1000 and 10000.

  • Page 23: Figure 14: Static Ttff Testing

    GNSS Module L76 EVB User Guide Figure 14: Static TTFF Testing Click “Set reference point”, choose “Reference location”. After start positioning, click “Use Mean Position”, then click “OK”. As shown in the screenshots below: L76_EVB_User Guide Confidential / Released 22 / 25...

  • Page 24: Figure 15: Static Ttff Testing Configuration Options

    GNSS Module L76 EVB User Guide Figure 15: Static TTFF Testing Configuration Options Click “Config”, set “TTFF Time- out (sec)”, then click “OK”, shown as below: In generally, if you choose hot start, “TTFF Time-out (sec)” sets 10s. If you choose warm start, the “TTFF Time-out (sec)”...

  • Page 25: Figure 16: Static Ttff Testing Configuration

    GNSS Module L76 EVB User Guide Figure 16: Static TTFF Testing Configuration The above operation is completed. Click on the Run button to start the test and it can be stopped by clicking Stop button. After finishing the testing, you can see the testing result charts. Of course, the result also will be stored in the tool installation path, and you can view the corresponding log.

  • Page 26: Appendix A Reference

    GNSS Module L76 EVB User Guide Appendix A Reference Table 6: Reference Document name Remark L76_Hardware_Design L76 Hardware Design L76_Protocol_Specification L76 Protocol Specification L76_Reference Design L76 Reference Design Table 7: Abbreviations Abbreviation Description Carrier-to-Noise Ratio Global Positioning System GLONASS Global Navigation Satellite System (The Russian GNSS)

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