u-blox EVK-M91 User Manual
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
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EVK-M91-User guide
Document information
Title EVK-M91
Subtitle Evaluation kit
Document type User guide
Document number UBX-19056858
Revision and date R03 03-Nov-2020
Document status
Disclosure restriction C1-Public
This document applies to the following products:
Product name Type number Firmware version PCN reference
EVK-M91 EVK-M91-00-00 SPG 4.04 N/A
u-blox reserves all rights to this document and the information contained herein. Products, names, logos and designs
described herein may in whole or in part be subject to intellectual property rights. Reproduction, use, modification or
disclosure to third parties of this document or any part thereof without the express permission of u-blox is strictly prohibited.
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
for a particular purpose of the information. This document may be revised by u-blox at any time. For most recent documents,
please visit www.u blox.com.
Copyright © 2020, u-blox AG.
u-blox is a registered trademark of u-blox Holding AG in the EU and other countries.
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EVK-M91-User guide
Contents
1 Product description.............................................................................................................. 5
1.1 Overview.................................................................................................................................................... 5
1.2 Kit contents..............................................................................................................................................5
1.3 System requirements.............................................................................................................................5
2 Specifications......................................................................................................................... 6
2.1 Safety precautions..................................................................................................................................6
3 Getting started...................................................................................................................... 7
3.1 u-center installation............................................................................................................................... 7
3.2 Hardware installation............................................................................................................................. 7
3.3 Serial port default configuration......................................................................................................... 7
4 Approvals..................................................................................................................................9
5 Device description.............................................................................................................. 10
5.1 Interface connection............................................................................................................................ 10
5.1.1 Interface switch............................................................................................................................10
5.1.2 USB..................................................................................................................................................11
5.1.3 UART...............................................................................................................................................11
5.1.4 SPI....................................................................................................................................................12
5.1.5 I2C....................................................................................................................................................12
5.2 GNSS input signal................................................................................................................................ 13
5.2.1 Antenna connector...................................................................................................................... 13
5.3 Time pulse.............................................................................................................................................. 13
5.4 Reset button..........................................................................................................................................13
5.5 Safe boot button...................................................................................................................................13
5.6 LED...........................................................................................................................................................14
5.7 Flash.........................................................................................................................................................14
5.8 Super capacitor..................................................................................................................................... 14
5.9 EXTINT.................................................................................................................................................... 14
6 Current measurement....................................................................................................... 15
6.1 GNSS current.........................................................................................................................................15
6.2 Backup current......................................................................................................................................15
7 Block diagram.......................................................................................................................16
8 Board layout..........................................................................................................................17
8.1 PCB version B........................................................................................................................................ 17
9 Firmware update..................................................................................................................18
10 Troubleshooting................................................................................................................ 20
11 Common evaluation pitfalls.......................................................................................... 22
Related documents................................................................................................................ 23
Revision history.......................................................................................................................24
Appendix.................................................................................................................................... 25
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A Glossary......................................................................................................................................................25
EVK-M91-User guide
1 Product description
1.1 Overview
EVK-M91 Evaluation Kit makes evaluating the high performance of u-blox M9 positioning
technology simple (see u-blox M9 www.u-blox.com/m9). The built-in USB interface provides both
power supply and high-speed data transfer, keeping the possibility to connect through 14 pin
connector. 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.
Evaluation kit Description Supported products
EVK-M91 u-blox M9 Evaluation kit with TCXO u-blox UBX-M9140 chips, NEO-M9N
Table 1: EVK-M91 supported products
1.2 Kit contents
module
The delivered package contains:
• Compact 105 x 64 x 26 mm EVK-M91 unit
• USB 2.0 cable (type C)
• Active GNSS antenna with 3 m cable
• EVK Welcome card
For EVK-M91 Quick start guide, see start.u-blox.com.
1.3 System requirements
• PC with USB interface (compatible with USB 2.0)
• Operating system: Microsoft Windows 7 onwards (x86 and x64 versions)
• Internet connection for the first time use
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2 Specifications
Parameter Specification
Serial interfaces
Timing interfaces
Dimensions
Power supply
Normal operating temperature
Table 2: EVK-M91 specifications
2.1 Safety precautions
1 USB 2.0 Type C
1 UART, max baud rate 921600 Bd
RS232 +/- 5 V level
14 pin – 3.0 V logic
1 I2C max 400 kHz
1 SPI – max SPI CLK 5.5 MHz, max data rate 1 Mbit/s
1 Time pulse output
105 x 64 x 26 mm
5 V via USB or powered via external power supply pin 14
(V5_IN) and pin 1 (GND)
-40 °C to +65 °C
EVK-M91-User guide
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 EVKM91, including interfaces and antennas. See section 5.2.1.1 of IEC 62368-1:2018 [11] for more
information on the ES1 class.
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EVK-M91-User guide
3 Getting started
3.1 u-center installation
u-center, the u-blox interactive evaluation software tool is required for configuration, testing,
visualization and data analysis of u-blox GNSS receivers as well as EVKs. The provided user guide
together with the evaluation tool provide useful assistance during all phases of a system integration
project.
u-center can be downloaded from www.u-blox.com/product/u-center. Once the zipped installer file
is downloaded, unzip it and double-click the exe 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 > u-blox > u-center > u-center). For more information on
how to evaluate using u-center, refer to the u-center User guide [10].
The required Microsoft CDC-ACM driver for Windows 10 USB interface is available from the
Microsoft Windows Update service. The Windows system driver search mechanism will download
and install the USB driver automatically from the Microsoft Windows Update service.
To evaluate with the Windows 7 and 8 operating systems, the u-blox GNSS standard driver (x64bit)
is needed which can be found in the u-center package.
3.2 Hardware installation
1. Connect the EVK-M91 to a PC running Microsoft Windows. The available interfaces are listed
below. Please refer to section Device description for more information on the interfaces.
• USB-C: Connect via USB-C port.
• UART: Connect via RS232. Set interface switch to I2C.
• SPI / I2C: Connect corresponding pins. Set interface switch accordingly to SPI or I2C. Refer
to Figure 2 to see these interface positions.
Press the RST button after changing the switch setting.
2. The device must always have power, either via USB on the back or the V5_IN input on the
front.
3. Connect the provided GNSS antenna to the evaluation unit and place the antenna in a
location with clear sky view.
4. Start the u-center GNSS evaluation software and select corresponding COM port and baud
rate.
Refer to the u-center User guide [10] for more information.
3.3 Serial port default configuration
Parameter Description Remark
RS232, Input UBX and NMEA protocol at 38400 Baud
RS232, Output UBX and NMEA protocol at 38400 Baud Only NMEA messages are activated by
USB, Input UBX and NMEA protocol
USB, Output UBX and NMEA protocol Only NMEA messages are activated by
Table 3: Default configuration
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default
default
EVK-M91-User guide
There are also SPI, I2C and UART interfaces available for debugging and design-in purposes
on the digital connector.
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