Table of Contents
Related Manuals for u-blox EVK-M91
Summary of Contents for u-blox EVK-M91
- Page 1 EVK-M91 Evaluation kit User guide Abstract This document describes the structure and use of the EVK-M91 evaluation kit and provides information for evaluating and testing u-blox M9 positioning technology. www.u-blox.com UBX-19056858 - R02...
- Page 2 The information contained herein is provided "as is" and u-blox assumes no liability for the use of the information. No warranty, either express or implied, is given with respect to, including but not limited to, the accuracy, correctness, reliability and fitness...
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Page 3: Table Of Contents
EVK-M91 - User guide Contents 1 Product description......................4 1.1 Overview..............................4 1.2 Kit contents..............................4 1.3 System requirements..........................4 2 Specifications......................... 5 2.1 Safety precautions..........................5 3 Getting started........................6 3.1 u-center installation..........................6 3.2 Hardware installation..........................6 3.3 Serial port default configuration......................6 4 Device description.........................8... -
Page 4: Product Description
EVK-M91 has versatile interfaces and measurement points that enable advanced evaluation needs. u-blox evaluation kits are compact, and their user-friendly interface and power supply make them ideally suited for use in laboratories or vehicles. Furthermore, they can be used with a PDA or a notebook PC, making them the perfect companion through all stages of design-in projects. -
Page 5: Specifications
Table 2: EVK-M91 specifications 2.1 Safety precautions EVK-M91 must be supplied by a PS1 class limited power source. See section 6.2.2.4 of IEC 62368-1:2018 [11] for more information on the PS1 class. In addition to a limited power source, only ES1 class circuits are to be connected to the EVK- M91, including interfaces and antennas. -
Page 6: Getting Started
file. The u-center software will be installed on your system and placed under the “u-blox” folder in the “Start > Programs” menu, you can also choose the destination folder for the program installation. After a successful installation, u-center can be started from the Start menu (All Programs >... - Page 7 EVK-M91 - User guide There are also SPI, I2C and UART interfaces available for debugging and design-in purposes on the digital connector. UBX-19056858 - R02 3 Getting started Page 7 of 24 ...
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Page 8: Device Description
EVK-M91 - User guide 4 Device description EVK-M91 evaluation unit contains the GNSS receiver, external TCXO, SAW and an LNA. Option for SPI flash can also be evaluated with the evaluation kit. 4.1 Interface connection The EVK-M91 supports all three communication interfaces: UART, I2C and SPI. For connecting the EVK to a PC, use a standard SUBD-9 cable or the included USB Type-C cable depending on the interface in use. -
Page 9: Usb
The USB Type-C connector on the evaluation board can be used for both power supply and communication. The easiest way to evaluate the EVK-M91 operation is to connect the EVK to a PC by the USB-C 2.0 cable and then to use the u-center to configure and monitor the GNSS functions. The USB connector has a direct connection to the u-blox M9 receiver, which enables the USB interface to be used as a communication interface as well. -
Page 10: Spi
Recommended common ground pin Table 5: EVK-M91 14 pin connector pin description Figure 3: EVK-M91 example 5 V DC power supply When using the 3.0 V digital interfaces with your application (e.g. SPI or I2C), a cable length less than 25 cm is recommended. -
Page 11: Gnss Input Signal
2) of the evaluation unit for connecting an active or a passive antenna. The RF path on EVK-M91 contains an LNA and a SAW filter having 3.0 V DC voltage in the RF input. The recommended maximum antenna supply current for active antennas is 40 mA and is limited by the internal antenna short circuit detection feature. -
Page 12: Led
GNSS fix, the LED will only be lit, without flashing. 4.7 Flash EVK-M91 has an SPI flash that is connected to the u-blox M9 receiver. By default it can be used to: • Store the current configuration permanently • Save data logging results •... -
Page 13: Current Measurement
™ Online service. On EVK-M91, the main supply voltage for the u-blox M9 GNSS receiver is 3.0 V. The internal DCDC converter is enabled to reduce power consumption. To measure the total GNSS supply current with EVK-M91, follow these steps: Power up EVK-M91. -
Page 14: Block Diagram
EVK-M91 - User guide 6 Block diagram EVK-M91 block diagram providing an overview on supply voltages and interfaces is shown in Figure Figure 4: EVK-M91 block diagram UBX-19056858 - R02 6 Block diagram Page 14 of 24 ... -
Page 15: Board Layout
EVK-M91 - User guide 7 Board layout 7.1 PCB version B The PCB for EVK-M91 is shown in Figure Figure 5: EVK-M91 PCB UBX-19056858 - R02 7 Board layout Page 15 of 24 ... -
Page 16: Firmware Update
This section shows how to update the firmware on EVK-M91 if required. The EVK-M91 is delivered with the latest version of firmware. However, as newer versions may become available during the lifetime of the product, you might need to update the firmware. - Page 17 EVK-M91 - User guide Select Tools > Firmware Update…. The firmware update window will appear as shown in Figure Figure 7: Firmware update tool Select the firmware image by clicking the ellipsis button next to Firmware image. Select Use this baudrate for update option and choose a higher baudrate, i.e., 460800 to make the firmware update faster.
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Page 18: Troubleshooting
EVK-M91 does not work properly when connected to a GNSS simulator When using EVK-M91 together with a GNSS simulator, please pay attention to proper handling of the EVK. A GNSS receiver is designed for real-life use, i.e., time is always moving forward. When using a GNSS simulator scenarios, the scenario time can be in the past resulting in the receiver to jump backwards in time. - Page 19 EVK-M91 - User guide Figure 8: Setting GPS week number with u-center GNSS evaluation software UBX-19056858 - R02 9 Troubleshooting Page 19 of 24 ...
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Page 20: Common Evaluation Pitfalls
(DOP), less position drift, and lower power consumption. • When doing reacquisition tests, cover the antenna in order to block the sky view. Do not unplug the antenna since the u-blox M9 positioning technology continuously performs a noise calibration on idle channels. -
Page 21: Related Documents
NEO-M9N Interface description, doc. no. UBX-19035940 [10] u-center User guide, doc. no. UBX-13005250 [11] Information technology equipment – Safety Standard IEC 62368-1:2018 For regular updates to u-blox documentation and to receive product change notifications please register at www.u-blox.com. UBX-19056858 - R02 Related documents Page 21 of 24 ... -
Page 22: Revision History
EVK-M91 - User guide Revision history Revision Date Name Status / comments 23-Dec-2019 msul, rmak Initial release 03-Apr-2020 msul Updated FW version to SPG 4.03 in page 2, updated RS232 output voltage level to +/-5 V in specifications section 2, updated safety precautions in section 2.1, updated short-circuit threshold value to 40mA in section 4.2.1,... -
Page 23: Appendix
EVK-M91 - User guide Appendix A Glossary Abbreviation Definition BeiDou Chinese navigation satellite system Evaluation Kit Inter-Integrated Circuit bus Electrostatic Discharge Galileo European navigation satellite system GLONASS Russian navigation satellite system Ground GNSS Global Navigation Satellite System Global Positioning System International Electrotechnical Commission... - Page 24 EVK-M91 - User guide 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...