Related Manuals for Quectel LC79D
Summary of Contents for Quectel LC79D
- Page 1 LC79D Hardware Design GNSS Module Series Rev. LC79D_Hardware_Design_V1.0 Date: 2019-11-14 Status: Released www.quectel.com...
- Page 2 QUECTEL OFFERS THE 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.
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Page 3: About The Document
GNSS Module Series LC79D Hardware Design About the Document History Revision Date Author Description Brooke WANG/ 2019-11-14 Initial Phil GAO LC79D_Hardware_Design 2 / 39... -
Page 4: Table Of Contents
GNSS Module Series LC79D Hardware Design Contents About the Document ..........................2 Contents ..............................3 Table Index ..............................5 Figure Index ..............................6 Introduction ............................7 1.1. Safety Information ........................7 Product Concept ..........................8 2.1. General Description ........................8 2.2. - Page 5 GNSS Module Series LC79D Hardware Design 6.1. Mechanical Dimensions of the Module ..................33 6.2. Recommended Footprint ......................35 6.3. Top and Bottom Views ......................36 Storage, Manufacturing, and Packaging ..................37 7.1. Storage ............................. 37 7.2. Manufacturing and Soldering ....................38 7.3.
- Page 6 LC79D Hardware Design Table Index TABLE 1: BANDS AND CONSTELLATIONS OF LC79D ................... 8 TABLE 2: KEY DIFFERENCES BETWEEN LC79D (A) AND LC79D (B) ............9 TABLE 3: KEY FEATURES ..........................10 TABLE 4: SUPPORTED PROTOCOLS ......................12 TABLE 5: I/O PARAMETERS DEFINITION ...................... 15 TABLE 6: PIN DESCRIPTION ...........................
- Page 7 GNSS Module Series LC79D Hardware Design Figure Index FIGURE 1: BLOCK DIAGRAM .......................... 12 FIGURE 2: PIN ASSIGNMENT ......................... 14 FIGURE 3: VCC INPUT REFERENCE CIRCUIT ....................18 FIGURE 4: INTERNAL POWER SYSTEM CONSTRUCTION ................19 FIGURE 5: REFERENCE CIRCUIT FOR NSTANDBY ..................21 FIGURE 6: REFERENCE DESIGN OF UART INTERFACE................
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Page 8: Introduction
Quectel LC79D module. Manufacturers of the terminal should notify users and operating personnel of the following safety information by incorporating these guidelines into all manuals supplied with the product. If not so, Quectel assumes no liability for any user’s failure to observe these precautions. -
Page 9: Product Concept
LC79D is a SMD type module with an ultra-compact form factor of 10.1mm × 9.7mm × 2.4mm. It can be embedded into terminals through its 18 LCC pins and 10 LGA pins. This document provides necessary hardware interfaces for connection with the motherboard of terminals. -
Page 10: Product Variants
2.2. Product Variants Due to supporting of different working modes, LC79D is classified into two variants: LC79D (A), supporting standalone mode, has a built-in flash and it boots firmware from the flash, so it can work independently. LC79D (B), supporting host mode, does not include a built-in flash, so it cannot work independently and has to boot firmware from an Android device. -
Page 11: Key Features
GNSS Module Series LC79D Hardware Design 2.3. Key Features Table 3: Key Features Features Details GPS L1 C/A (1574.397MHz ~ 1576.443MHz) BeiDou B1 C/A (1559.052MHz ~ 1563.144MHz) GLONASS L1 OF (1597.781MHz ~ 1605.656MHz) Supported Bands Galileo E1 OS (1573.374MHz ~ 1577.466MHz) ... -
Page 12: Block Diagram
The following figure shows the block diagram of LC79D module. The module includes a single-chip GNSS IC, two LNAs, two SAW filters, a diplexer, a flash (for LC79D (A) only), a TCXO and a crystal oscillator. The diplexer integrates a band-pass filter inside which can improve the out-of-band rejection. Thus the... -
Page 13: Evaluation Board
Figure 1: Block Diagram 2.5. Evaluation Board In order to facilitate application development with LC79D, Quectel supplies an evaluation board (LC79D EVB) with a Micro-USB cable, an active antenna and other peripherals to test the module. For more details, please refer to document [2] and document [3]. - Page 14 GNSS Module Series LC79D Hardware Design NOTE Please refer to document [1] for more details. LC79D_Hardware_Design 13 / 42...
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Page 15: Application Interfaces
GNSS Module Series LC79D Hardware Design Application Interfaces LC79D is designed with 28 pins (18 LCC pins and 10 LGA pins) through which the module can be mounted to the motherboard of any terminal. 3.1. Pin Assignment TXD/SPI_CLK I2C_SCL RXD/SPI_CS... -
Page 16: Pin Description
GNSS Module Series LC79D Hardware Design NOTES 1. Keep all unused and RESERVED pins open. 2. LC79D (A) does not support RDY feature, please keep this pin open while designing. 3.2. Pin Description Table 5: I/O Parameters Definition Type Description... - Page 17 GNSS Module Series LC79D Hardware Design Standby Mode Control Pin Name Pin No. Description DC Characteristics Comment min=-0.3V Standby mode max=0.35×VCC Active low. NSTANDBY control min=0.65×VCC Pulled up by default. max=VCC+0.3V UART/SPI Interface Pin Name Pin No. Description DC Characteristics...
- Page 18 GNSS Module Series LC79D Hardware Design Synchronized on max=0.4V rising edge, and the One pulse per 1PPS min=VCC-0.45V pulse width is 5ms. second nom=1.8V If unused, keep this pin open. While keeping the pin floating during startup, the module min=-0.3V...
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Page 19: Power Supply
GNSS Module Series LC79D Hardware Design ready for when AP_REQ is communication driven high. with the AP Low level: the module is in sleep mode and is not ready to communicate with the AP. High level: the module is awake and... -
Page 20: Operation Modes
Update Rate GPS+BeiDou+GLONASS GNSS +Galileo+QZSS+IRNSS NOTE GGA, RMC, GSA and GSV are the output types of NMEA messages supported by LC79D: GGA: Global Positioning System Fix Data RMC: Recommended Minimum Specific GNSS Data LC79D_Hardware_Design 19 / 42... -
Page 21: Sleep Mode
GNSS Module Series LC79D Hardware Design GSA: GNSS DOP and Active Satellites GSV: GNSS Satellites in View GLL: Geographic Position - Latitude and Longitude VTG: Course Over Ground and Ground Speed For more details, please refer to document [1]. -
Page 22: Uart Interface
3. Pulling down NSTANDBY pin for at least 20ms and then releasing it will reset the module. 3.5. UART Interface LC79D (A) module provides one UART interface. The following are the features of the UART. UART is used for NMEA output and firmware upgrade. -
Page 23: Spi Interface
UART (TXD, RXD, CTS and RTS) in host mode for upgrading. “ ” represents the test points of UART interface. 3.6. SPI Interface LC79D (B) provides one SPI interface for connection with an external android device. The following are the features of the SPI interface. Operate as a slave. -
Page 24: I2C Interface
Figure 7: Reference Design of SPI Interface NOTE Must keep BOOT pin at high level for 100ms during the startup of LC79D (B) module. For more details about the control circuit, please refer to documents [3]. 3.7. I2C Interface* LC79D module provides one I2C interface which provides features as listed below: ... -
Page 25: Boot Interface
When the module is powered on, the voltage level of the BOOT pin will be checked to identify its working mode. Table 8: Working Modes Voltage Level Working Mode Comment While keeping the pin floating during startup, LC79D module will Floating Normal enter normal working mode. While keeping the pin at high level for about 100ms during startup, High Host LC79D module will enter host mode. - Page 26 GNSS Module Series LC79D Hardware Design NOTES 1. LC79D (B) must work in host mode. 2. For more details about the reference design of BOOT interface, please refer to documents [3]. LC79D_Hardware_Design 25 / 42...
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Page 27: Antenna Interfaces
LC79D Hardware Design Antenna Interfaces LC79D module supports GPS, BeiDou, GLONASS, Galileo, IRNSS and QZSS systems. The RF signal is obtained from the RF_IN pin and the acceptable input power range should be between -162dBm and -65dBm. The impedance of RF trace should be controlled as 50Ω, and the trace length should be kept as short as possible. -
Page 28: Recommended Antenna Reference Designs
4.2. Recommended Antenna Reference Designs 4.2.1. Antenna Selection Guide Both active and passive dual-band (L1+L5) GNSS antennas can be used for LC79D module. Passive antenna is recommended if the antenna can be placed close to the module, for instance, when the distance between the module and the antenna is less than 1m. -
Page 29: Passive Antenna Reference Design
GNSS Module Series LC79D Hardware Design Active Antenna LC79D Module П Matching Circuit C1 100pF RF_IN R2 10R VCC_RF Figure 10: Reference Design for Active Antenna C1 is used to block DC from VCC_RF. C2, C3 and R1 are reserved matching circuits for antenna impedance modification. - Page 30 GNSS Module Series LC79D Hardware Design C1, R1, C2 are reserved matching circuits for antenna impedance modification. By default, R1 is 0Ω, while C1 and C2 are not mounted. The impedance of RF trace should be controlled as 50Ω and the trace length should be kept as short as possible.
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Page 31: Electrical, Reliability And Radio Characteristics
GNSS Module Series LC79D Hardware Design Electrical, Reliability and Radio Characteristics 5.1. Absolute Maximum Ratings Absolute maximum rating for power supply and voltage on digital pins of the module are listed in the following table. Table 10: Absolute Maximum Ratings Parameter Min. -
Page 32: Operating Conditions
Proper ESD handling and packaging procedures must be applied throughout processing, handling and operation of any application that incorporates the module. Please note that the following measures are beneficial to ESD protection when LC79D module is handled. LC79D_Hardware_Design 31 / 42... - Page 33 GNSS Module Series LC79D Hardware Design The first contact point shall always be between the local GND and PCB GND when handling the PCB, unless there is a galvanic coupling between the local GND and the PCB GND. ...
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Page 34: Mechanical Dimensions
GNSS Module Series LC79D Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. All dimensions are measured in millimeter (mm), and the dimensional tolerances are ± 0.05mm unless otherwise specified. 6.1. Mechanical Dimensions of the Module 9.70±... - Page 35 GNSS Module Series LC79D Hardware Design Figure 13: Bottom Dimensions LC79D_Hardware_Design 34 / 42...
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Page 36: Recommended Footprint
GNSS Module Series LC79D Hardware Design 6.2. Recommended Footprint Figure 14: Recommended Footprint NOTE For easy maintenance of this module and accessing to these pads, it is recommended to keep a distance of no less than 3mm between the module and other components on a motherboard. -
Page 37: Top And Bottom Views
6.3. Top and Bottom Views Figure 15: Top View of the Module Figure 16: Bottom View of the Module NOTE These are renderings of LC79D module. For authentic appearance, please refer to the module that you receive from Quectel. LC79D_Hardware_Design 36 / 42... -
Page 38: Storage, Manufacturing, And Packaging
Storage, Manufacturing, and Packaging 7.1. Storage LC79D is stored in a vacuum-sealed bag. It is rated at MSL 3, and its storage restrictions are shown as below. 1. Shelf life in the vacuum-sealed bag: 12 months at <40º C/90%RH. 2. After the vacuum-sealed bag is opened, devices that will be subjected to reflow soldering or other high temperature processes must be: Mounted within 168 hours at the factory environment of ≤30ºC/60%RH. -
Page 39: Manufacturing And Soldering
GNSS Module Series LC79D Hardware Design 7.2. Manufacturing and Soldering Push the squeegee to apply the solder paste on the surface of stencil, thus making the paste fill the stencil openings and then penetrate to the PCB. The force on the squeegee should be adjusted properly so as to produce a clean stencil surface on a single pass. -
Page 40: Tape And Reel Packaging
QR code is still readable, although white rust may be found. 7.3. Tape and Reel Packaging LC79D is packaged in tape and reel carriers. One reel is 8.64m long and contains 500 modules. LC79D_Hardware_Design 39 / 42... - Page 41 GNSS Module Series LC79D Hardware Design 28.5 Out direction 24.5 16.00 ±0.15 2.00 ±0.15 4.00 ±0.15 0.30±0.05 10.10 ±0.15 Unit: mm Quantity per reel: 500pcs Length per reel: 8.64m 10.10? à0.15 Figure 18: Tape and Reel Specifications Table 14: Packaging Specifications...
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Page 42: Appendix A References
LC79D Hardware Design Appendix A References Table 15: Related Documents Document Name Remark Quectel_LC79D_GNSS_Protocol_Specification LC79D GNSS Protocol Specification Quectel_LC79D(A)_EVB_User_Guide LC79D (A) EVB User Guide Quectel_LC79D(B)_EVB_User_Guide LC79D (B) EVB User Guide Quectel_LC79D_Reference_Design LC79D Reference Design Quectel_RF_Layout_Application_Note RF Layout Guide Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide... - Page 43 GNSS Module Series LC79D Hardware Design Kbps Kilo Bits Per Second Low Noise Amplifier MSAS Multi-functional Satellite Augmentation System Minimum Order Quantity NMEA National Marine Electronics Association Pulse Per Second QZSS Quasi-Zenith Satellite System RHCP Right Hand Circular Polarization Surface Acoustic Wave...