Quectel L76 User manual

L76 EVB User Guide
GNSS Module Series
Rev. L76_EVB_User_Guide_V1.1
Date: 2013-04-02
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Our aim is to provide customers with timely and comprehensive service. For any
assistance, please contact our company headquarter:
Quectel Wireless Solutions Co., Ltd.
Room 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233
Tel: [phone]
Mail: [e-mail]
Or our local office, for more information, please visit:
http://www.quectel.com/quectel_sales_office.html
For technical support, to report documentation errors, please visit:
http://www.quectel.com/tecsupport.aspx
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QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION
PROVIDED IS BASED UPON CUSTOMERS‟ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT
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Copyright © Quectel Wireless Solutions Co., Ltd. 2013. All rights reserved.
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About the document
History
Revision
Date
Author
Description
1.0
2013-02-25
Dishon ZHOU
Initial
1.1
2013-03-26
Dishon ZHOU
Optimized the contents of Chapter 3.
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Contents
About the document ................................................................................................................................... 2
Contents....................................................................................................................................................... 3
Table Index................................................................................................................................................... 4
Figure Index ................................................................................................................................................. 5
1Introduction .......................................................................................................................................... 6
2Introduction to EVB Kit ....................................................................................................................... 7
2.1. EVB Top and Bottom View.......................................................................................................... 7
2.2. EVB Accessories......................................................................................................................... 8
3Interface Application ......................................................................................................................... 10
3.1. USB Interface............................................................................................................................ 10
3.2. UART Interface.......................................................................................................................... 11
3.3. Antenna Interface...................................................................................................................... 12
3.4. Switches and Buttons ............................................................................................................... 13
3.5. Operating Status LEDs ............................................................................................................. 14
3.6. Test Points................................................................................................................................. 15
4EVB and Accessories........................................................................................................................ 17
5Install Device Driver........................................................................................................................... 18
6Starting PowerGPS ............................................................................................................................ 19
7Appendix A Reference....................................................................................................................... 25
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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 .................................................................................................................................... 25
TABLE 7: ABBREVIATIONS .............................................................................................................................. 25
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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 .................................................................................................................. 12
FIGURE 7: LNA LAYOUT .................................................................................................................................. 12
FIGURE 8: SWITCHES AND BUTTONS .......................................................................................................... 13
FIGURE 9: OPERATING STATUS LEDS .......................................................................................................... 14
FIGURE 10: TEST POINTS J106...................................................................................................................... 15
FIGURE 11: EVB AND ACCESSORY EQUIPMENTS ...................................................................................... 17
FIGURE 12: POWERGPS TOOL ...................................................................................................................... 19
FIGURE 13: MTK COMMAND .......................................................................................................................... 21
FIGURE 14: STATIC TTFF TESTING ............................................................................................................... 22
FIGURE 15: STATIC TTFF TESTING CONFIGURATION OPTIONS ............................................................... 23
FIGURE 16: STATIC TTFF TESTING CONFIGURATION ................................................................................ 24
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1Introduction
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.
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2Introduction to EVB Kit
2.1. EVB Top and Bottom View
Figure 1: EVB Top View
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Figure 2: EVB Bottom View
A: UART port
B: Serial port alternation switch
C: RESET button
D: FORCE_ON button
E: POWER switch
F: Micro-USB port
G: Indication LEDs
H: Antenna interface
I: L76 Module
J: STANDBY switch
K: Test points
2.2. EVB Accessories
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Figure 3: EVB Accessories
A: USB cable
B: GNSS active antenna (3.3V)
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3Interface 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. So the easy way is to use
Micro-USB cable which both supplies the power and outputs NEMA. You can makes alternation
between UART port and Micro-USB interfaces via switch (S2).
If you want to use PowerGPS Tool, UART interface is recommended for data communication.
NOTE
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3.2. UART Interface
Figure 5: UART Interface
Table 1: Pins of UART port
Pin
Signal
I/O
Description
2
RXD
I
Receive data
3
TXD
O
Transmit data
5
GND
GND
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3.3. Antenna Interface
Figure 6: Antenna Interface
Figure 7: LNA Layout
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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.
3.4. Switches and Buttons
Figure 8: Switches and Buttons
Table 2: Switches and Buttons
Part
Name
I/O
Description
S1
POWER
I
Control power supply via Micro-USB.
S2
Serial port
alternation switch
I
QUECTEL EVB supplies two communicative
ways: Micro-USB and UART which are controlled
by switch.
S3
STANDBY
I
The module will enter into standby mode when
switching from OFF to ON, and exit from standby
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mode in the opposite operation.
K1
FORCE_ON
I
Press and release the button, the module will be
waked up from backup mode.
K2
RESET
I
Press and release this button, then the module
will reset.
3.5. Operating Status LEDs
Figure 9: Operating Status LEDs
Table 3: Operating status LEDs
Part
Name
I/O
Description
L1
TXD1
O
Flash: turn on successfully, Micro-USB or UART1
port can output messages.
Extinct: fail to turn on the module.
L2
1PPS
O
Flash: fix successfully, the frequency is 1Hz.
Extinct: no fix.
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3.6. Test Points
Figure 10: Test Points J106
Table 4: Pins of J106
Pin
Signal
I/O
Description
1
32K/DRIN
Reserved
2
AADET_N
I
Active antenna open circuit detection
3
1PPS
O
1 pulse per second
4
STANDBY
I
Enter or exit standby mode
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5/10
GND
Ground
6
FORCE_ON
Logic high will force module to be waked
up from backup mode. Keep this pin open
or pulled low before entering into backup
mode. If unused, keep this pin open.
7
RESET
I
System reset
8
TXD1
O
Transmit data
9
RXD1
I
Receive data
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4EVB and Accessories
The EVB and its accessories are equipped as shown in Figure 11.
Figure 11: EVB and Accessory Equipments
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5Install 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.
The download path of our FTP server is as below:
Overseas customer: /d:/FTP/OC/Overseas_Technical/Overseas_Module Official Documents/GNSS
Module/Common/04 Tool Kit/ GNSS_EVB_Micro-USB_Driver_CP210x.
Domestic customer: /d:/FTP/CC/Domestic_Technical/Domestic_Module Official Documents/GNSS
Module/Common/04 Tool Kit/ GNSS_EVB_Micro-USB_Driver_CP210x.
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6Starting PowerGPS
The PowerGPS version is V2.2.0. The PowerGPS tool can help user to view the status of
GPS&GLONASS receiver conveniently. When the tool is opened, the following window will be displayed:
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.
Explanations are listed in Table 5.
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