NEO-M8U u-blox M8 Untethered Dead Reckoning module including 3D inertial sensors Data Sheet Abstract This data sheet describes the NEO-M8U module, which provides leading performance and continuous navigation even with poor GNSS signal conditions. It functions independently of any electrical connection to the car. www.u-blox.
NEO-M8U - Data Sheet Document Information Title NEO-M8U Subtitle u-blox M8 Untethered Dead Reckoning module including 3D inertial sensors Document type Data Sheet Document number UBX-15015679 Revision and date R06 Document status Product Information 15-Feb-2018 Product status Corresponding content status In Development / Prototype Objective Specification Target values. Revised and supplementary data will be published later.
NEO-M8U - Data Sheet Contents Document Information ................................................................................................................................ 2 Contents .......................................................................................................................................................... 3 1 Functional description ......................................................................................................................... 5 1.
NEO-M8U - Data Sheet 1.19.1 Power control .....................................................................................................................................13 1.20 Antenna.......................................................................................................................................................13 2 Pin Definition ........................................................................................................................................ 14 2.
NEO-M8U - Data Sheet 1 ☞ Functional description For more information about the functions, see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification Error! Reference source not found.. 1.1 Overview The NEO-M8U module introduces u-blox’s Untethered Dead Reckoning (UDR) technology, which provides continuous navigation without requiring speed information from the vehicle.
NEO-M8U - Data Sheet 1.3 Performance Parameter Specification Receiver type 72-channel u-blox M8 engine GPS L1C/A, SBAS L1C/A, QZSS L1C/A, QZSS L1-SAIF, GLONASS L1OF, BeiDou B1I , Galileo E1B/C Accuracy of time pulse signal RMS 30 ns 99% 60 ns Frequency of time pulse signal 0.25 Hz…10 MHz (configurable) Operational limits 1 Dynamics ≤4g Altitude 50,000 m Velocity 500 m/s Velocity accuracy 2 0.5 m/s.
NEO-M8U - Data Sheet 1.4 Block diagram Figure 1: NEO-M8U block diagram 1.5 Supported GNSS Constellations The NEO-M8U GNSS module is a concurrent GNSS receiver which can receive and track multiple GNSS systems: GPS, Galileo, GLONASS and BeiDou. Owing to the dual-frequency RF front-end architecture, either GLONASS or BeiDou can be processed concurrently with GPS and Galileo signals providing reception of three GNSS systems.
NEO-M8U - Data Sheet 1.5.1 GPS The NEO-M8U positioning module is designed to receive and track the L1C/A signals provided at 1575.42 MHz by the Global Positioning System (GPS). The NEO-M8U can receive and process GPS concurrently with Galileo and one of GLONASS or BeiDou. 1.5.2 GLONASS The NEO-M8U positioning module can receive and process GLONASS concurrently with GPS and Galileo together or BeiDou.
NEO-M8U - Data Sheet 1.6.3 AssistNowTM Autonomous AssistNow Autonomous provides aiding information without the need for a host or external network connection. Based on previous broadcast satellite ephemeris data downloaded to and stored by the GNSS receiver, AssistNow Autonomous automatically generates accurate satellite orbital data (“AssistNow Autonomous data”) that is usable for future GNSS position fixes.
NEO-M8U - Data Sheet 1.7.5 Differential GPS (D-GPS) The use of Differential-GPS data improves GPS position accuracy using real time data from a nearby reference receiver or network. The NEO-M8U receiver supports D-GPS only with Dead Reckoning disabled (using message UBX-CFG-NAVX5). D-GPS starts on receipt of valid data according RTCM 10402.3: “RECOMMENDED STANDARDS FOR DIFFERENTIAL GNSS”. RTCM cannot be used together with SBAS or Dead Reckoning and is applicable only to GPS signals in the NEO-M8U.
NEO-M8U - Data Sheet 1.10 Odometer The odometer provides information on travelled ground distance (in meter) using position and velocity measurements from the combined GNSS/DR navigation solution. For each computed travelled distance since the last odometer reset, the odometer estimates a 1-sigma accuracy value. The total cumulative ground distance is maintained and saved in the BBR memory. ☞ The odometer feature is disabled by default. 1.
NEO-M8U - Data Sheet 1.16 Protocols and interfaces Protocol Type NMEA 0183 V4.0 (V2.1, V2.3 and V4.1 configurable) Input/output, ASCII UBX Input/output, binary, u-blox proprietary RTCM Input, messages 1, 2, 3, 9 Table 4: Available Protocols All protocols are available on UART, USB, DDC (I2C compliant) and SPI. For specification of the various protocols see the u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification Error! Reference source not found.. 1.
NEO-M8U - Data Sheet 1.18.2 Real-Time Clock (RTC) and Hardware Backup mode The RTC can be maintained by a secondary 32 kHz oscillator using an RTC crystal. If the main supply voltage is removed, a battery connected to V_BCKP allows the RTC to continue to run with very low power consumption.
NEO-M8U - Data Sheet 2 Pin Definition 2.1 Pin assignment Figure 2: Pin Assignment No Name I/O Description 1 SAFEBOOT_N I SAFEBOOT_N, Test-point for service use (Leave OPEN) 2 D_SEL I Interface select 3 TIMEPULSE I/O Time pulse (disabled by default), do not pull low during reset Note: configured using TIMEPULSE2 messages (see section 1.
NEO-M8U - Data Sheet ☞ Pins designated Reserved should not be used. For more information about Pinouts see the NEOM8U Hardware Integration Manual Error! Reference source not found.. 2.2 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. The table below lists the pins that have changed name along with their old and new names.
NEO-M8U - Data Sheet 3 Configuration management Configuration settings can be modified with UBX configuration messages. The modified settings remain effective until power-down or reset. Settings can also be saved in battery-backed RAM, Flash or both using the UBX-CFG-CFG message. If settings have been stored in battery-backed RAM then the modified configuration will be retained as long as the backup battery supply is not interrupted.
NEO-M8U - Data Sheet 4 Electrical specification ☞ The limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the specification is not implied. Exposure to these limits for extended periods may affect device reliability.
NEO-M8U - Data Sheet 4.2 Operating conditions ☞ All specifications are at an ambient temperature of 25°C. Extreme operating temperatures can significantly impact specification values. Applications operating near the temperature limits should be tested to ensure the specification. Parameter Symbol Min Typical Max Units Power supply voltage VCC 2.7 3.0 3.6 V Supply voltage USB VDD_USB 3.0 3.3 3.6 V Backup battery voltage V_BCKP 1.4 Backup battery current I_BCKP 15 µA V_BCKP = 1.
NEO-M8U - Data Sheet 4.4 SPI timing diagrams In order to avoid incorrect operation of the SPI, the user needs to comply with certain timing conditions. The following signals need to be considered for timing constraints: Symbol Description SPI CS_N (SS_N) Slave select signal SPI CLK (SCK) Slave clock signal Table 12: Symbol description Figure 3: SPI timing diagram 4.4.1 Timing recommendations The recommendations below are based on a firmware running from Flash memory.
NEO-M8U - Data Sheet 5 Mechanical specifications Symbol Description Min. (mm) Typ. (mm) Max. (mm) A Module height 15.9 16.0 16.6 B Module width 12.1 12.2 12.3 C Module total thickness 2.2 2.4 2.6 D, G Horizontal edge to pin pitch 0.9 1.0 1.3 E Pin to pin pitch 1.0 1.1 1.2 F Gap width 2.9 3.0 3.1 H Module PCB thickness K1 Pad width (metal) 0.7 0.8 0.9 K2 Pad width (metal / solder mask) 0.7 0.8 / 0.9 0.9 / 1.2 M1 Pad height (metal) 0.7 0.8 0.
NEO-M8U - Data Sheet 6 Reliability tests and approvals 6.1 Reliability tests ☞ The NEO-M8U module is based on AEC-Q100 qualified GNSS chips. Tests for product family qualifications are according to ISO 16750 "Road vehicles – environmental conditions and testing for electrical and electronic equipment”, and appropriate standards. 6.
NEO-M8U - Data Sheet 7 Product handling & soldering 7.1 Packaging The NEO-M8U GNSS modules are delivered as hermetically sealed, reeled tapes in order to enable efficient production, production lot set-up and tear-down. For more information see the u-blox Package Information Guide Error! Reference source not found.. 7.1.1 Reels The NEO-M8U GNSS modules are deliverable in quantities of 250 pcs on a reel.
NEO-M8U - Data Sheet 7.2.1 Moisture Sensitivity Levels The Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions required. The NEO-M8U modules are rated at MSL level 4. ☞ ☞ For MSL standard see IPC/JEDEC J-STD-020, which can be downloaded from www.jedec.org. For more information regarding MSL see the u-blox Package Information Guide Error! Reference source not found.. 7.2.
NEO-M8U - Data Sheet 8 Default messages Interface Settings UART Output 9600 Baud, 8 bits, no parity bit, 1 stop bit Configured to transmit both NMEA and UBX protocols, but only the following NMEA (and no UBX) messages have been activated at start-up: GGA, GLL, GSA, GSV, RMC, VTG, TXT USB Output Configured to transmit both NMEA and UBX protocols, but only the following NMEA (and no UBX) messages have been activated at start-up: GGA, GLL, GSA, GSV, RMC, VTG, TXT USB Power Mode: Bus Powered UART Input
NEO-M8U - Data Sheet 9 Labeling and ordering information 9.1 Product labeling The labeling of u-blox M8 GNSS modules includes important product information. The location of the NEO-M8U product type number is shown in Figure 6. Figure 6: Location of product type number on the u-blox NEO-M8U module label 9.2 Explanation of codes Three different product code formats are used.
NEO-M8U - Data Sheet Related documents [1] [2] [3] [4] ☞ NEO-M8U Hardware Integration Manual, UBX-15016700 u-blox 8 / u-blox M8 Receiver Description including Protocol Specification, UBX 13003221 u-blox Package Information Guide, UBX-14001652 MGA Services User Guide, UBX-13004360 For regular updates to u-blox documentation and to receive product change notifications, register on our homepage (www.u-blox.com).
NEO-M8U - Data Sheet Contact For complete contact information, visit us at www.u-blox.com. u-blox Offices North, Central and South America u-blox America, Inc. Phone: E-mail: +1 703 483 3180 info_us@u-blox.com Regional Office West Coast: Phone: E-mail: +1 408 573 3640 info_us@u-blox.com Technical Support: Phone: E-mail: Headquarters Europe, Middle East, Africa Asia, Australia, Pacific u-blox AG Phone: +65 6734 3811 E-mail: info_ap@u-blox.com Support: support_ap@u-blox.
