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Ublox NEO-D9S Integration Manual

Ublox NEO-D9S Integration Manual

Correction data receiver
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NEO-D9S
u-blox D9 correction data receiver
Integration manual
Abstract
This document describes the features and specifications of the u-blox D9
correction data receiver.
www.u-blox.com
UBX-19026111 - R07
C1-Public

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  • Page 1  NEO-D9S u-blox D9 correction data receiver Integration manual Abstract This document describes the features and specifications of the u-blox D9 correction data receiver. www.u-blox.com UBX-19026111 - R07 C1-Public...
  • Page 2 NEO-D9S - Integration manual Document information Title NEO-D9S Subtitle u-blox D9 correction data receiver Document type Integration manual Document number UBX-19026111 Revision and date 24-Jan-2022 Disclosure restriction C1-Public This document applies to the following products: Type number FW version IN/PCN reference RN reference NEO-D9S-00A-00 PMP 1.04...

  • Page 3: Table Of Contents

    4.1 Pin assignment............................23 4.2 Antenna..............................24 4.2.1 Antenna bias..........................27 4.3 Power supply............................29 4.3.1 VCC: Main supply voltage......................29 4.3.2 NEO-D9S power supply......................29 4.4 NEO-D9S minimal design........................30 4.5 EOS/ESD precautions.......................... 31 4.5.1 ESD protection measures......................31 UBX-19026111 - R07...
  • Page 4 4.5.2 EOS precautions...........................31 4.5.3 Safety precautions........................32 4.6 Electromagnetic interference on I/O lines..................32 4.6.1 General notes on interference issues..................32 4.6.2 In-band interference mitigation....................33 4.6.3 Out-of-band interference......................33 4.7 Layout..............................34 4.7.1 Placement............................34 4.7.2 Thermal management........................ 34 4.7.3 Package footprint, copper and paste mask................34 4.7.4 Layout guidance...........................

  • Page 5: Integration Manual Overview

    NEO-D9S - Integration manual 1 Integration manual overview This document is an important source of information on all aspects of u-blox D9 correction data 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

    2 System description 2.1 Overview NEO-D9S is a satellite data receiver for L-band correction broadcast, which can be configured for use with a variety of correction services. It decodes the satellite transmission and outputs a correction stream, enabling a high precision GNSS receiver to reach accuracies down to centimeter level.

  • Page 7: Receiver Functionality

    NEO-D9S - Integration manual 3 Receiver functionality This section describes the NEO-D9S 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.

  • Page 8: Basic Receiver Configuration

    Table 1: Default interface settings The boot message is still output using $GNTXT messages. The messages are output when the NEO-D9S is powered up. Refer to the applicable interface description [2] for information about further settings. 3.1.4 Basic receiver configuration This section summarizes the basic receiver configuration most commonly used.

  • Page 9: L-Band Service Selection

    NEO-D9S - Integration manual All message output is additionally subject to the protocol configuration of the communication interfaces. Messages of a given protocol will not be output until the protocol is enabled for output on the interface (see Communication interface configuration). 3.1.5 L-band service selection Any particular service provider will have several requirements that need to be configured before the...

  • Page 10: Communication Interfaces

    NMEA) can be assigned to a single port (multi-protocol capability), which is particularly useful for debugging purposes. The NEO-D9S provides UART1, UART2, SPI, I2C and USB interfaces for communication with a host CPU. The interfaces are configured via the configuration methods described in the applicable interface description [2].

  • Page 11: Uart

    The NEO-D9S includes two UART serial ports. UART1 can be used as a host interface for configuration, monitoring and control.

  • Page 12: I2C Interface

    NEO-D9S - Integration manual Baud rate Data bits Parity Stop bits 57600 none 115200 none 230400 none 460800 none 921600 none Table 3: Possible UART interface configurations Users should allow a short time delay of typically 100 ms between sending a baud rate change message and providing input data at the new rate.
  • Page 13 NEO-D9S - Integration manual of a valid message. If the message data is ready for transmission, the successive reads of register 0xFF will deliver the waiting message data. Do not use registers 0x00 to 0xFC. They are reserved for future use and they do not currently provide any meaningful data.
  • Page 14 NEO-D9S - Integration manual Figure 6: 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 15: Spi Interface

    Figure 8: I2C write access 3.2.3 SPI interface NEO-D9S 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 16: Usb Interface

    NEO-D9S - Integration manual Figure 9: SPI back-to-back read/write access 3.2.4 USB interface A single USB port is provided for host communication purposes. The USB 2.0 FS (Full speed, 12 Mbit/s) interface can be used for host communication. Due to the hardware implementation, it may not be possible to certify the USB interface.

  • Page 17: Predefined Pios

    Table 4: D_SEL configuration 3.3.2 RESET_N The NEO-D9S 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 18: Tx_Ready

    NEO-D9S - Integration manual In this mode only UART1 communication is possible. For communication via UART1 in safe boot mode, the host must send a training sequence (0x55 0x55 at 9600 baud) to the receiver in order to begin communication. After this the host must wait at least 2 ms before sending any data.

  • Page 19: Antenna Supervisor

    The following schematic details the required circuit and the sections following it explain how to enable and monitor each feature: Figure 11: NEO-D9S antenna supervisor The bias-t inductor must be chosen for multi-band operation; a value of 47 nH ±5% is required for our recommended Murata part, with the current limited below its 300 mA rating.

  • Page 20: Antenna Voltage Control - Ant_Off

    NEO-D9S - Integration manual Part Recommendation Comment Murata GRM033R71C103KE14 CAP CER X7R 0402 10N 10% 16V TYCO, 0.25PF, PESD0402-140 -55/+125C ESD protection diode on RF trace Table 5: Recommended components for antenna supervisor 3.4.1 Antenna voltage control - ANT_OFF Antenna status (as reported in UBX-MON-RF and UBX-INF-NOTICE messages) is not reported unless the antenna voltage control has been enabled.

  • Page 21: Antenna Short Detection Auto Recovery

    NEO-D9S - Integration manual After a detected antenna short, the reported antenna status will keep on being reported as shorted. If the antenna short detection auto recovery is enabled, then the antenna status can recover after a timeout. To recover the antenna status immediately, a power cycle is required or configuring the antenna short detection functionality off...

  • Page 22: Security

    • Hardware and software versions, using UBX-MON-VER. 3.6 Forcing a receiver reset The NEO-D9S 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: Design

    This section provides information to help carry out a successful schematic and PCB design integrating the NEO-D9S. 4.1 Pin assignment The pin assignment of the NEO-D9S module is shown in Figure 12. The defined configuration of the PIOs is listed in...

  • Page 24: Antenna

    Table 6: NEO-D9S pin assignment 4.2 Antenna An active antenna is mandatory with the NEO-D9S. The NEO-D9S needs to receive L-band signals in order to operate. A separate L-band antenna should be used to meet the requirement of +4 dBic patch element gain.
  • Page 25 1525.0 - 1559.0 MHz (1550.0 - 1559.0 MHz for NEO-D9S-01A). An active antenna is required to provide sufficient low noise gain at the required correction service frequency and ensure any cable loss does not inpact the antenna noise figure.
  • Page 26 15 kV human body model air discharge Table 8: Antenna specifications for NEO-D9S modules The NEO-D9S-01A antenna requirement is formulated under practical conditions for operating close to Ligado equipments, nominally 10 m from a BTS (eNB) or 1 m from a handset (UE).

  • Page 27: Antenna Bias

    A 10 Ω resistor (R2) is provided to measure the current. This resistor power rating must be chosen to ensure reliability in the chosen circuit design. Figure 15: NEO-D9S antenna bias inductor impedance A recommended circuit design for an active antenna bias is shown below. This example shows an external voltage of 3.3 V with current limiting as described above.
  • Page 28 NEO-D9S - Integration manual Figure 16: NEO-D9S 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 C3: Murata GRM155R61A104KA01 CER X5R 0402 100N 10% 10V R2: RES THICK FILM CHIP 1206 10R 5% 0.25W It is recommended to use active current limiting.

  • Page 29: 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-D9S 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 30: Neo-D9S Minimal Design

    Figure 19: NEO-D9S power supply 4.4 NEO-D9S minimal design The minimal electrical circuit for NEO-D9S operation using the UART1 interface is shown below: Figure 20: Minimal NEO-D9S design It is important to connect V_USB to ground if USB is not used.

  • Page 31: Eos/Esd Precautions

    NEO-D9S - Integration manual 4.5 EOS/ESD precautions To avoid overstress damage during production or in the field it is essential to observe strict EOS/ESD/EMI handling and protection measures. To prevent overstress damage at the RF_IN of your receiver, never exceed the maximum input power as specified in the applicable data sheet [1].

  • Page 32: Safety Precautions

    Figure 22: Active antenna EOS protection 4.5.3 Safety precautions The NEO-D9S 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: In-Band Interference Mitigation

    NEO-D9S - Integration manual • In-band interference: Although the L-band band is kept free from intentional RF signal sources by radio-communications standards, many devices emit RF power into the L-band band at levels much higher than the L-band signal itself. One reason is that the frequency band above 1 GHz is not well regulated with regards to EMI, and even if permitted, signal levels are much higher than L-band signal power.

  • Page 34: Layout

    4.7.3 Package footprint, copper and paste mask Copper and solder mask dimensioning recommendations for the NEO-D9S 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 35 NEO-D9S - Integration manual 4.7.3.1 Mechanical dimensions Figure 23: NEO-D9S mechanical dimensions 4.7.3.2 Footprint Figure 24: NEO-D9S suggested footprint (i.e. copper mask) UBX-19026111 - R07 4 Design Page 35 of 52   C1-Public...

  • Page 36: Layout Guidance

    NEO-D9S - Integration manual 4.7.3.3 Paste mask Figure 25: NEO-D9S 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-D9S - Integration manual Figure 27: Grounded co-planar RF trace The RF trace must be shielded by vias to ground along the entire length of the trace and the NEO- D9S RF_IN pad should be surrounded by vias as shown in the figure below.

  • Page 38: Design Guidance

    • Is there a 1 uF cap right next to the module VCC pin? • Connect the power supply to VCC. • Compare the peak current consumption of the NEO-D9S L-band module with the specification of your power supply. • L-band 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.

  • Page 39: Antenna/Rf Input

    • With the NEO-D9S L-band module, an active antenna meeting our antenna requirements is mandatory to achieve the performance values as written in the NEO-D9S datasheet and with a minimum gain of 20 dB being reached at the module RF_IN pin.

  • Page 40: Layout Design-In Guideline

    • Choose the required serial communication interfaces (UART, USB, SPI or I2C) and connect the appropriate pins to your application. • Antenna bias is required, see NEO-D9S antenna bias section. 4.8.5 Layout design-in guideline • Is the receiver placed away from heat sources? •...

  • Page 41: Product Handling

    NEO-D9S - Integration manual 5 Product handling 5.1 ESD handling precautions NEO-D9S 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 42 NEO-D9S - Integration manual As a reference, see “IPC-7530 Guidelines for temperature profiling for mass soldering (reflow and wave) processes”, published in 2001. Preheat phase During the initial heating of component leads and balls, residual humidity will be dried out. Note that the preheat phase does not replace prior baking procedures.
  • Page 43 NEO-D9S - Integration manual Figure 31: Soldering profile for automotive grade NEO-D9S 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 44: Tapes

    NEO-D9S - Integration manual Rework We do not recommend using a hot air gun because it is an uncontrolled process and can damage the module. Use of a hot air gun can lead to overheating and severely damage the module. Always avoid overheating the module.

  • Page 45: Reels

    Figure 33: NEO-D9S tape dimensions (mm) 5.4 Reels The NEO-D9S 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-D9S is specified in the table below.
  • Page 46 NEO-D9S - Integration manual Package MSL level 4 (NEO-D9S-00B), 3 (NEO-D9S-00A and NEO-D9S-01A) Table 10: MSL level 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].

  • Page 47: Appendix

    NEO-D9S - Integration manual Appendix A Stacked patch antenna A typical low cost L1 + L2 + L-band antenna is based on a stacked patch antenna design. This consists of two discrete ceramic patch elements with an L1/ L-band patch above an L2 patch.

  • Page 48: B Glossary

    NEO-D9S - Integration manual Figure 35: Low cost L1/L2/L-band antenna band characteristics In the above test the L-band antenna patch gain and pass band roll off is not to the required specification and is included purely as an example. B Glossary Abbreviation Definition...
  • Page 49 NEO-D9S - Integration manual Abbreviation Definition GNSS Global navigation satellite system Global Positioning System Global System for Mobile Communications Inter-integrated circuit bus International Electrotechnical Commission Printed circuit board Point to multipoint transmission QZSS Quasi-Zenith Satellite System Radio frequency Space vehicle, a satellite...

  • Page 50: Related Documents

    NEO-D9S - Integration manual Related documents NEO-D9S-00B Data sheet, UBX-18012996 NEO-D9S-00A Data sheet, UBX-21008859 NEO-D9S-01A Data sheet, UBX-21008860 PMP 1.04 Interface description, UBX-21040023 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.

  • Page 51: Revision History

    Status / comments 04-July-2019 ghun NEO-D9S-00B: Objective Specification 17-Dec-2019 ghun/jhak NEO-D9S-00B: Advance Information - V_BCKP pin connect to VCC. I2C, SPI, antenna supervisor, EXTINT, TX-READY, extended TX timeout, software back-up mode added. 04-Feb-2020 ghun NEO-D9S-00B: Early production information - I2C address changed.
  • Page 52 NEO-D9S - 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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