u-blox NEO-M8U Hardware Integration Manual
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u-blox NEO-M8U Hardware Integration Manual

Untethered dead reckoning module including 3d inertial sensors
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NEO-M8U
u-blox M8 Untethered Dead Reckoning module including
3D inertial sensors
Hardware Integration Manual
Abstract
This document describes the features and specifications of NEO-M8U, a high-performance
untethered dead reckoning module with 3D sensors. The module includes the u-blox M8 concurrent
GNSS engine with reception of GPS, GLONASS, BeiDou, Galileo and QZSS signals.
www.u-blox.com
UBX-15016700 - R07

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  • Page 1 Hardware Integration Manual Abstract This document describes the features and specifications of NEO-M8U, a high-performance untethered dead reckoning module with 3D sensors. The module includes the u-blox M8 concurrent GNSS engine with reception of GPS, GLONASS, BeiDou, Galileo and QZSS signals. www.u-blox.com...

  • Page 2: Document Information

    The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular purpose of the information.

  • Page 3: Table Of Contents

    3.2 Installation ..............................15 3.3 Initialization and Calibration ........................15 Migration from NEO-M8L to NEO-M8U ..................16 4.1 Hardware migration NEO-M8L to NEO-M8U ..................16 Product handling ..........................17 5.1 Packaging, shipping, storage and moisture preconditioning ............17 5.2 Soldering ..............................17 5.3 EOS/ESD/EMI precautions ........................
  • Page 4 NEO-M8U - Hardware Integration Manual Related documents ........................... 27 Revision history ............................27 Contact ................................28 UBX-15016700 - R07 Contents Page 4 of 28 Production Information...

  • Page 5: Hardware Description

    Hardware description 1.1 Overview The NEO-M8U is an Untethered Dead Reckoning module bringing the benefits of dead reckoning to a wider range of road-vehicle applications by eliminating the need for a speed or wheel-tick connection to the vehicle. The module uses built-in gyroscope and accelerometer sensors and features the high performance u-blox M8 concurrent positioning engine.

  • Page 6: Vdd_Usb: Usb Interface Power Supply

    If no backup supply voltage is available, connect the V_BCKP pin to VCC. ☞ As long as power is supplied to the NEO-M8U module through the VCC pin, the backup battery is disconnected from the RTC and the BBR to avoid unnecessary battery drain (see Figure 1). In this case, VCC supplies power to the RTC and BBR.

  • Page 7: Display Data Channel (Ddc)

    1.4.3 Display Data Channel (DDC) An I C compatible Display Data Channel (DDC) interface is available with a NEO-M8U module for serial communication with an external host CPU. The interface only supports operation in slave mode (master mode is not supported). The DDC protocol and electrical interface are fully compatible with the Fast-Mode of the I C industry standard.

  • Page 8: Tx Ready Signal

    Driving RESET_N low activates a hardware reset of the system. Use this pin only to reset the module. Do not use RESET_N to turn the module on and off, since the reset state increases power consumption, or as a POR. With the NEO-M8U module the RESET_N pin is an input only. D_SEL: Interface select The D_SEL pin selects the available interfaces.
  • Page 9 NEO-M8U - Hardware Integration Manual Figure 3 shows an example of EMI protection measures on the RX/TX line using a ferrite bead. More information can be found in section 5.3. Figure 3: EMI Precautions Design UBX-15016700 - R07 Hardware description...

  • Page 10: Design

    NEO-M8U - Hardware Integration Manual Design 2.1 Pin description Name Description SAFEBOOT_N SAFEBOOT_N, Test-point for service use (Leave OPEN) D_SEL Interface select TIMEPULSE Time pulse (disabled by default). Do not pull low during reset. Note: configured using TIMEPULSE2 messages (see...

  • Page 11: Pin Name Changes

    NEO-M8U - Hardware Integration Manual 2.1.1 Pin name changes Selected pin names have been updated to agree with a common naming convention across u-blox modules. The pins have not changed their operation and are the same physical hardware but with updated names.

  • Page 12: Antenna

    12.2 mm [480.3 mil] 12.2 mm [480 mil] 14.6 mm [575 mil] Figure 5: NEO-M8U footprint / NEO-M8U paste mask 2.4 Antenna 2.4.1 Antenna design with passive antenna A design using a passive antenna requires more attention to the layout of the RF section. Typically, a passive antenna is located near electronic components;...

  • Page 13: Active Antenna Design

    GNSS system power consumption budget with additional 5 to 20 mA typically. If the supply voltage of the NEO-M8U module matches the supply voltage of the active antenna (e.g. 3.0 V), use the filtered supply voltage available at pin VCC_RF as shown in Figure 8. For exact pin...
  • Page 14 NEO-M8U - Hardware Integration Manual Active antenna design powered from an external supply Figure 9: Active antenna design, direct external supply ☞ The circuit shown in Figure 9 works with all u-blox M8 modules, including modules without VCC_RF output. UBX-15016700 - R07 Design...

  • Page 15: Untethered Dead Reckoning

    3.2 Installation In order to achieve good performance, the NEO-M8U hardware needs to be mounted in the vehicle in such a way that its alignment is stable to within 2°. It is important that the mounting design minimizes vibration and mechanical resonance.

  • Page 16: Migration From Neo-M8L To Neo-M8U

    Migration from NEO-M8L to NEO-M8U 4.1 Hardware migration NEO-M8L to NEO-M8U u-blox is committed to ensuring that NEO-M8U are backwards compatible to NEO-M8L. It is highly advisable that customers consider a design review with the u-blox support team to ensure the compatibility of key functionalities.

  • Page 17: Product Handling

    NEO-M8U - Hardware Integration Manual Product handling 5.1 Packaging, shipping, storage and moisture preconditioning For information pertaining to reels and tapes, Moisture Sensitivity levels (MSL), shipment and NEO-M8U Data Sheet storage information, as well as drying for preconditioning see the [1].
  • Page 18 • Temperature fall rate: max 4 °C/s ☞ To avoid falling off, the NEO-M8U module should be placed on the topside of the motherboard during soldering. The final soldering temperature chosen at the factory depends on additional external factors like choice of soldering paste, size, thickness and properties of the base board, etc.
  • Page 19 Rework The NEO-M8U module can be unsoldered from the baseboard using a hot air gun. When using a hot air gun for unsoldering the module, a maximum of one reflow cycle is allowed. In general, we do not recommend using a hot air gun because this is an uncontrolled process and might damage the module.

  • Page 20: Eos/Esd/Emi Precautions

    ☞ u-blox makes no warranty for damages to the NEO-M8U module caused by soldering metal cables or any other forms of metal strips directly onto the EMI covers. Use of ultrasonic processes Some components on the u-blox M8 module are sensitive to Ultrasonic Waves.
  • Page 21 NEO-M8U - Hardware Integration Manual • Unless there is a galvanic coupling between the local GND (i.e. the work table) and the PCB GND, then the first point of contact when handling the PCB must always be between the local GND and PCB GND.
  • Page 22 NEO-M8U - Hardware Integration Manual Electrical Overstress (EOS) Electrical Overstress (EOS) usually describes situations when the maximum input power exceeds the maximum specified ratings. EOS failure can happen if RF emitters are close to a GNSS receiver or its antenna. EOS causes damage to the chip structures. If the RF_IN is damaged by EOS, it is hard to determine whether the chip structures have been damaged by ESD or EOS.

  • Page 23: Applications With Cellular Modules

    Consult the Data Sheet for the absolute maximum power input at the GNSS receiver. ☞ See the GPS Implementation and Aiding Features in u-blox wireless modules [6]. Isolation between GNSS and cellular antennas In multi-antenna designs, an isolation of approximately 20 dB can be reached with careful placement of the antennas.
  • Page 24 Figure 17: Measures against out-band interference ☞ For design-in recommendations in combination to Cellular operation see the appendix. ☞ See the GPS Implementation and Aiding Features in u-blox wireless modules [6]. UBX-15016700 - R07 Product handling Page 24 of 28...

  • Page 25: Appendix

    NEO-M8U - Hardware Integration Manual Appendix A Glossary Recommended parts Recommended parts are selected on data sheet basis only. Other components may also be used. Part Manufacturer Parts ID Remarks Parameters to consider Diode ESD9R3.3ST5G Standoff Voltage>3.3 V Low Capacitance < 0.5 pF Semi- ESD9L3.3ST5G...
  • Page 26 NEO-M8U - Hardware Integration Manual Recommended parts Manufacturer Order No. Comments Hirschmann (www.hirschmann-car.com) GLONASS 9 M GPS+GLONASS active Taoglas (www.taoglas.com) AA.160.301111 36*36*4 mm, 3-5V 30mA active Taoglas (www.taoglas.com) AA.161.301111 36*36*3 mm, 1.8 to 5.5V / 10mA at 3V active INPAQ (www.inpaq.com.tw) B3G02G-S3-01-A 2.7 to 3.9 V / 10 mA active...

  • Page 27: Related Documents

    NEO-M8U - Hardware Integration Manual Related documents NEO-M8U Data Sheet, Doc. No. UBX-15015679 u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification (Public version), Doc. UBX-13003221 GPS Antenna Application Note, Doc. No. GPS-X-08014 GPS Compendium, Doc. No. GPS-X-02007 I2C-bus specification and user manual, Revision 6, 20140404 http://www.nxp.com/documents/user_manual/UM10204.pdf...

  • Page 28: Ubx-15016700 - R07

    NEO-M8U - Hardware 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 Singapore Pte. Ltd. u-blox AG Phone: +1 703 483 3180...

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Neo-m8u-04b-00Neo-m8l

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