u-blox EVK-M91, User Manual

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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
4.1 Interface connection...............................................................................................................................8
4.1.1 Interface switch.............................................................................................................................. 8
4.1.2 USB.................................................................................................................................................... 9
4.1.3 UART................................................................................................................................................. 9
4.1.4 SPI....................................................................................................................................................10
4.1.5 I2C....................................................................................................................................................10
4.2 GNSS input signal................................................................................................................................ 11
4.2.1 Antenna connector...................................................................................................................... 11
4.3 Time pulse.............................................................................................................................................. 11
4.4 Reset button..........................................................................................................................................11
4.5 Safe boot button...................................................................................................................................11
4.6 LED...........................................................................................................................................................12
4.7 Flash.........................................................................................................................................................12
4.8 Super capacitor..................................................................................................................................... 12
4.9 EXTINT.................................................................................................................................................... 12
5 Current measurement....................................................................................................... 13
5.1 GNSS current.........................................................................................................................................13
5.2 Backup current...................................................................................................................................... 13
6 Block diagram.......................................................................................................................14
7 Board layout..........................................................................................................................15
7.1 PCB version B........................................................................................................................................ 15
8 Firmware update..................................................................................................................16
9 Troubleshooting...................................................................................................................18
10 Common evaluation pitfalls.......................................................................................... 20
Related documents................................................................................................................ 21
Revision history....................................................................................................................... 22
Appendix.................................................................................................................................... 23
A Glossary......................................................................................................................................................23
UBX-19056858 - R02 Contents Page 3 of 24