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u-blox NEO-D9C Integration Manual

D9 qzss correction service receiver
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NEO-D9C
u-blox D9 QZSS correction service receiver
Integration manual
Abstract
This document describes the features and specifications of the NEO-D9C
QZSS correction service receiver.
www.u-blox.com
UBX-21031631 - R02
C1-Public

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  • Page 1  NEO-D9C u-blox D9 QZSS correction service receiver Integration manual Abstract This document describes the features and specifications of the NEO-D9C QZSS correction service receiver. www.u-blox.com UBX-21031631 - R02 C1-Public...
  • Page 2 fitness for a particular purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent documents, visit www.u-blox.com.

  • Page 3: Table Of Contents

    4.1 Pin assignment............................24 4.2 Antenna..............................25 4.2.1 Antenna bias..........................27 4.3 Power supply............................30 4.3.1 VCC: Main supply voltage......................30 4.3.2 NEO-D9C power supply......................30 4.4 NEO-D9C minimal design........................30 4.5 EOS/ESD precautions.......................... 31 4.5.1 ESD protection measures......................31 4.5.2 EOS precautions...........................32 4.5.3 Safety precautions........................
  • Page 4 4.7 Layout..............................34 4.7.1 Placement............................34 4.7.2 Thermal management........................ 34 4.7.3 Package footprint, copper and paste mask................35 4.7.4 Layout guidance........................... 36 4.8 Design guidance............................39 4.8.1 General considerations....................... 39 4.8.2 RF front-end circuit options...................... 39 4.8.3 Antenna/RF input........................40 4.8.4 Ground pads..........................41 4.8.5 Schematic design........................

  • Page 5: Integration Manual Overview

    NEO-D9C - Integration manual 1 Integration manual overview This document is an important source of information on all aspects of NEO-D9C QZSS correction service receiver. The purpose of this document is to provide guidelines for a successful integration of the receiver with the customer's end product.

  • Page 6: System Description

    Service (CLAS) and experimental MADOCA service. The QZSS CLAS service provides high-accuracy augmentation to GNSS receivers. The CLAS service is available over mainland Japan for free. Combined with other products from u-blox, NEO-D9C builds a complete and stand-alone high precision system providing users with access to free high-accuracy correction services and ultimately centimeter-level GNSS accuracy.
  • Page 7 The QZSS service transmits signals from the L5 band up to and including the L1 band. The NEO-D9C requires the QZSS L2C signals as well as the QZSS L6 signal in order to operate. It cannot provide the L6 message data without first acquiring the QZSS L2C signal.

  • Page 8: Architecture

    NEO-D9C - Integration manual 2.2 Architecture The NEO-D9C receiver provides all the necessary RF and baseband processing to enable multi- constellation operation. The block diagram below shows the key functionality. 2.2.1 Block diagram Figure 4: NEO-D9C block diagram An active antenna is mandatory with the NEO-D9C.

  • Page 9: Receiver Functionality

    This section describes the NEO-D9C operational features and their configuration. 3.1 Receiver configuration u-blox positioning receivers are fully configurable with UBX protocol messages. The configuration used by the receiver during normal operation is called the "current configuration". The current configuration can be changed during normal operation by sending UBX configuration messages. On start-up the current configuration held in RAM is built from the default firmware settings plus any...

  • Page 10: Basic Receiver Configuration

    These messages can be from two different QZSS L6 satellites if needed. There is no pilot signal on the L6 band, and the tracking parameters must be obtained from the corresponding L2 signal. Therefore, the NEO-D9C needs to receive QZSS L2 signals and QZSS L6 UBX-21031631 - R02...
  • Page 11 NEO-D9C - Integration manual signals in order to operate. Ensure the receiving antenna used supports L2 and L6 signals. It will first acquire the QZSS L2 signals before acquiring the QZSS L6 signals. The L6 messages can be the L6D and the L6E message at the same time if required. The RXM- QZSSL6 message has two channels, therefore only two possible L6 message streams can be provided.
  • Page 12 NEO-D9C - Integration manual Figure 6: QZSS L6 single satellite messages Two QZSS satellites can be used as a source for either the L6D or L6E message. Only a maximum of two satellites can be used to provide the L6 messages. Figure 7: QZSS L6 double satellite messages The required QZSS L6 satellite ID and message can be selected using the following configuration...

  • Page 13: Qzss L6 Data Message Output

    ZED-F9x output interface. No NMEA messages should be enabled. The USB interfaces of the ZED-F9x and NEO-D9C can be used as host interface. If the host interface is only UART1 for both units, the host application must re-direct the three required messages to the NEO-D9C input.

  • Page 14: Communication Interfaces

    The NEO-D9C will output the raw QZSS L6 data messages in the UBX-RXM-QZSSL6 message. This message can contain both the L6D and L6E service data if required.

  • Page 15: Uart

    The NEO-D9C includes two UART serial ports. UART1 can be used as a host interface for configuration, monitoring and control.

  • Page 16: I2C Interface

    3.2.2 I2C interface An I2C interface is available for communication with an external host CPU or u-blox cellular modules. The interface can be operated in slave mode only. The I2C protocol and electrical interface are fully compatible with the I2C industry standard fast mode.
  • Page 17 NEO-D9C - Integration manual Do not use registers 0x00 to 0xFC. They are reserved for future use and they do not currently provide any meaningful data. Figure 11: I2C register layout 3.2.2.2 Read access types There are two I2C read transfer forms: •...
  • Page 18 NEO-D9C - Integration manual Figure 12: I2C random read access If the second form, "current address" is used, an address pointer in the receiver is used to determine which register to read. This address pointer will increment after each read unless it is already pointing at register 0xFF, the highest addressable register, in which case it remains unaltered.

  • Page 19: Spi Interface

    Figure 14: I2C write access 3.2.3 SPI interface NEO-D9C has an SPI slave interface that can be selected by setting D_SEL = 0. The SPI slave interface is shared with UART1 and I2C port, the physical pins are same. The SPI pins available are: •...

  • Page 20: Usb Interface

    USB host compatibility testing is thus recommended in this scenario. The NEO-D9C receiver supports only self-powered mode operation in which the receiver is supplied from its own power supply. The V_USB pin is used to detect the availability of the USB port, i.e.

  • Page 21: Predefined Pios

    Table 4: D_SEL configuration 3.3.2 RESET_N The NEO-D9C provides the ability to reset the receiver. The RESET_N pin is an input-only pin with an internal pull-up resistor. Driving RESET_N low for at least 100 ms will trigger a cold start.

  • Page 22: Extended Tx Timeout

    • Hardware and software versions, using UBX-MON-VER. 3.5 Forcing a receiver reset The NEO-D9C is not a GNSS receiver and does not operate to the same principles as a standard GNSS. However it does support the standard UBX-CFG-RST command. Data stored in flash memory is not cleared by any of the options provided by UBX-CFG-RST.
  • Page 23 NEO-D9C - Integration manual Contact u-blox for more information on firmware update. UBX-21031631 - R02 3 Receiver functionality Page 23 of 53   C1-Public...

  • Page 24: Design

    This section provides information to help carry out a successful schematic and PCB design integrating the NEO-D9C. 4.1 Pin assignment The pin assignment of the NEO-D9C module is shown in Figure 17. The defined configuration of the PIOs is listed in...

  • Page 25: Antenna

    4.2 Antenna An active antenna NEO-D9C is mandatory for operation. The NEO-D9C needs to receive L2 and L6 signals in order to operate. A combined L1/L2/L6 active antenna is recommended if used with a ZED-F9x. If a combined L1/L2/L6 active antenna needs to be implemented in an application case, it is recommended that an OEM active antenna module is used that meets our specification.
  • Page 26 Figure 19: Typical combined L1 + L2/E5b + L6 active antenna structure Figure 20: Typical combined NEO-D9C and ZED-F9x combined RF front end and system UART2 may be used to provide correction data directly to a high precision GNSS receiver from the u-blox F9 platform.

  • Page 27: Antenna Bias

    5 to 20 mA to the system's power consumption budget. If the supply voltage of the NEO-D9C module matches the supply voltage of the antenna (e.g. 3.0 V), you can use the filtered supply voltage VCC_RF output to supply the antenna. However a current limiting resistor is required to prevent against short circuits destroying the bias-t inductor.
  • Page 28 3.3 V with current limiting as described above. An ESD protection diode should also be connected to the input as shown. Figure 22: NEO-D9C reference design for antenna bias L1: Murata LQG15HS47NJ02 0402 47 N 5% 0.30 A -55/+125 C D1: TYCO, 0.25PF, PESD0402-140 -55/+125C...
  • Page 29 The bias-t inductor current capability and the bias resistor value need to be calculated as shown above. The supply voltage for the bias-t and its current capability is part of the calculation. Figure 24: NEO-D9C external voltage antenna bias UBX-21031631 - R02 4 Design Page 29 of 53  ...

  • Page 30: Power Supply

    Do not add any series resistance greater than 0.2 Ω to the VCC supply as it will generate input voltage noise due to dynamic current conditions. For the NEO-D9C module the equipment must be supplied by an external limited power source in compliance with the clause 2.5 of the standard IEC 60950-1.

  • Page 31: Eos/Esd Precautions

    UART2 may be used to provide correction data directly to a high precision GNSS receiver from the u-blox F9 platform. To check whether a specific u-blox F9 product supports correction data output by the NEO-D9S, refer to its Integration manual.

  • Page 32: Eos Precautions

    Figure 28: Active antenna EOS protection 4.5.3 Safety precautions The NEO-D9C must be supplied by an external limited power source in compliance with the clause 2.5 of the standard IEC 60950-1. In addition to external limited power source, only Separated or Safety Extra-Low Voltage (SELV) circuits are to be connected to the module including interfaces and antennas.

  • Page 33: General Notes On Interference Issues

    NEO-D9C - Integration manual emits from unshielded I/O lines. Receiver performance may be degraded when this noise is coupled into the antenna. EMI protection measures are particularly useful when RF emitting devices are placed next to the receiver and/or to minimize the risk of EMI degradation due to self-jamming. An adequate layout with a robust grounding concept is essential in order to protect against EMI.

  • Page 34: Out-Of-Band Interference

    If this is insufficient, an additional SAW filter is required on the receiver input to block the remaining GSM transmitter energy. 4.7 Layout This section details layout and placement requirements of the NEO-D9C QZSS correction service receiver. 4.7.1 Placement signals at the surface of the Earth are below the thermal noise floor.

  • Page 35: Package Footprint, Copper And Paste Mask

    4.7.3 Package footprint, copper and paste mask Copper and solder mask dimensioning recommendations for the NEO-D9C module packages are provided in this section. The module edge pads are 0.8 mm x 0.9 mm. Implement a pad size on your PCB as a copper pad size of 0.8 mm x 1.8 mm.

  • Page 36: Layout Guidance

    NEO-D9C - Integration manual 4.7.3.2 Footprint Figure 30: NEO-D9C suggested footprint (i.e. copper mask) 4.7.3.3 Paste mask Figure 31: NEO-D9C suggested paste mask To improve the wetting of the half vias, reduce the amount of solder paste under the module and increase the volume outside of the module by defining the dimensions of the paste mask to form a T-shape (or equivalent) extending beyond the copper mask.
  • Page 37 NEO-D9C - Integration manual For FR-4 PCB material with a dielectric permittivity of for example 4.7, the trace width for the 50 Ω line impedance can be calculated. Figure 32: Microstrip trace width A grounded co-planar RF trace is recommended as it provides the maximum shielding from noise with adequate vias to the ground layer.
  • Page 38 4.7.4.2 VCC pad The VCC pad for the NEO-D9C QZSS correction service receiver needs to have as low an impedance as possible with large vias to the lower power layer of the PCB. The VCC pad needs a large pad and the decoupling capacitor must be placed as close as possible.

  • Page 39: Design Guidance

    • Compare the peak current consumption of the NEO-D9C module with the specification of your power supply. • receivers require a stable power supply. Avoid series resistance (less than 0.2 Ω) in your power supply line (the line to VCC) to minimize the voltage ripple on VCC. See the NEO-D9C Power supply...

  • Page 40: Antenna/Rf Input

    (BeiDou, GLONASS). The same is true if a multi constellation configuration is used. A single system being received must have 6 satellites at the minimum signal level and quality to achieve RTK fixed status. L2/L6 signals for the NEO-D9C must have similar C/N0 levels.

  • Page 41: Ground Pads

    Ensure the ground pads of the module are connected to ground. 4.8.5 Schematic design For a minimal design with the NEO-D9C modules, consider the following functions and pins: • Connect the power supply to VCC. • V_USB: If USB is used it is recommended V_USB is to be powered as per USB self-powered mode specification.

  • Page 42: Product Handling

    NEO-D9C - Integration manual 5 Product handling 5.1 ESD handling precautions NEO-D9C contains highly sensitive electronic circuitry and is an Electrostatic Sensitive Device (ESD). Observe precautions for handling! Failure to observe these precautions can result in severe damage to the GNSS receiver! •...
  • Page 43 Exceeding the maximum soldering temperature in the recommended soldering profile may permanently damage the module. Figure 36: Soldering profile for professional grade NEO-D9C UBX-21031631 - R02 5 Product handling Page 43 of 53  ...
  • Page 44 NEO-D9C - Integration manual Figure 37: Soldering profile for automotive grade NEO-D9C Modules must not be soldered with a damp heat process. Optical inspection After soldering the module, consider optical inspection. Cleaning Do not clean with water, solvent, or ultrasonic cleaner: • Cleaning with water will lead to capillary effects where water is absorbed into the gap between the baseboard and the module.

  • Page 45: Tapes

    EMI covers is done at the customer’s own risk. The numerous ground pins should be sufficient to provide optimum immunity to interferences and noise. u-blox makes no warranty for damages to the module caused by soldering metal cables or any other forms of metal strips directly onto the EMI covers.

  • Page 46: Reels

    Figure 39: NEO-D9C tape dimensions (mm) 5.4 Reels The NEO-D9C receivers are deliverable in quantities of 250 pieces on a reel. The receivers are shipped on reel type B, as specified in the u-blox Package Information Guide [3]. 5.5 Moisture sensitivity levels The moisture sensitivity level (MSL) for NEO-D9C is specified in the table below.
  • Page 47 For MSL standard see IPC/JEDEC J-STD-020, which can be downloaded from www.jedec.org. For more information regarding moisture sensitivity levels, labeling, storage and drying, see the u-blox Package Information Guide [3]. UBX-21031631 - R02 5 Product handling Page 47 of 53  ...

  • Page 48: Appendix

    NEO-D9C - Integration manual Appendix A Stacked patch antenna A typical low cost L1 + L2 + L6 antenna is based on a stacked patch antenna design. This consists of two discrete ceramic patch elements with an L1 patch above an L2/L6 patch.

  • Page 49: B Glossary

    NEO-D9C - Integration manual successful calibration can be made if the phase variation of a specific antenna is repeatable between samples. To obtain the best antenna performance in an automotive application, mount the antenna in the center of a conductive car roof without any inclination. The antenna requires good signal levels and as wide a view of the sky as possible.
  • Page 50 NEO-D9C - Integration manual Abbreviation Definition Electromagnetic interference Electrical overstress Electrostatic protective area Electrostatic discharge Galileo European navigation satellite system GLONASS Russian navigation satellite system Ground GNSS Global navigation satellite system Global Positioning System Global System for Mobile Communications Inter-integrated circuit bus...

  • Page 51: Related Documents

    NEO-D9C-00A Data sheet C2-Restricted, UBX-20057098 QZS 1.01 Interface description, UBX-21031777 Packaging information for u-blox chips, modules, and antennas, UBX-14001652 For regular updates to u-blox documentation and to receive product change notifications please register on our homepage https://www.u-blox.com. UBX-21031631 - R02 Related documents Page 51 of 53  ...

  • Page 52: Revision History

    NEO-D9C - Integration manual Revision history Revision Date Name Status / comments 27-Aug-2021 dbhu First issue of the document 16-Dec-2021 dama UART2 interface general update UBX-21031631 - R02 Revision history Page 52 of 53   C1-Public...
  • Page 53 NEO-D9C - Integration manual Contact For complete contact information visit us at www.u-blox.com. u-blox Offices North, Central and South America Headquarters Asia, Australia, Pacific   Europe, Middle East, Africa u-blox America, Inc. u-blox AG u-blox Singapore Pte. Ltd. Phone: +1 703 483 3180...

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