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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

Summary of Contents for EVK-M91

Page 1: ...on 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: ...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 corr...

Page 3: ...witch 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...

Page 4: ...ratories 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 module Table 1 EVK M91 supported products 1 2 Kit contents The delivered package contains Compact 105 x 64 x 26 mm EVK M91 unit...

Page 5: ...nal power supply pin 14 V5_IN and pin 1 GND Normal operating temperature 40 C to 65 C 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 a...

Page 6: ...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 RS23...

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 ...

Page 8: ...B Additional measurement equipment can be connected to the front connector Figure 1 Connecting the unit for power supply and communication Figure 2 shows the front and the back panel of the EVK M91 evaluation unit Figure 2 EVK M91 front and back panels 4 1 1 Interface switch Use the interface switch on the front panel to choose between I2C UART and SPI communication ports You must reset the unit b...

Page 9: ... conﬁgure the RS232 port use the CFG VALSET command and select CFG UART1 Conﬁguration group in the u center application The maximum operating baud rate is 921600 Bd If you are using a USB to RS232 adaptor cable you can connect it directly to the evaluation kit RS232 port The 9 pin RS232 female connector is assigned as listed below Pin Nr Assignment 1 6 Time pulse 2 TXD SPI_MISO GNSS Transmit Data ...

Page 10: ...SPI interface selected chip select input LOW ACTIVE 4 SCL SCK I 3 0 V Clock input Can also be used as generic input output PIO4 3 TxD MISO O 3 0 V Serial port transmit or SPI slave transmit operation selected by interface switch 2 RxD MOSI I 3 0 V Serial port receive or SPI slave receive operation selected by interface switch 1 GND I Recommended common ground pin Table 5 EVK M91 14 pin connector p...

Page 11: ...e 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 Please refer to 9 for more details In addition to internal short circuit antenna detection feature a hardware short circuit protection limits the maximum current to 100 mA This pin is also ESD protected 4 3 Time pulse u blox receivers ...

Page 12: ...ble for application use The remainder of the space is reserved for other features 4 8 Super capacitor The evaluation board includes a super capacitor to supply the backup power domain of the EVK M91 and is charged whenever there is a power supply available either via USB or the 14 pins connector The super capacitor provides backup power directly to the EVK M91 V_BCKP power input in case of no othe...

Page 13: ...ower consumption To measure the total GNSS supply current with EVK M91 follow these steps 1 Power up EVK M91 2 Connect a true RMS voltmeter across GNSS I1 pin 12 and GNSS I2 pin 13 of the 14 pin connector 3 Read the voltage and average if necessary on the voltmeter and convert to current 1 mV equals 1 mA 4 Perform the test with good signals and clear sky view to ensure that the receiver can acquir...

Page 14: ...91 User guide 6 Block diagram EVK M91 block diagram providing an overview on supply voltages and interfaces is shown in Figure 4 Figure 4 EVK M91 block diagram UBX 19056858 R02 6 Block diagram Page 14 of 24 ...

Page 15: ...EVK M91 User guide 7 Board layout 7 1 PCB version B The PCB for EVK M91 is shown in Figure 5 Figure 5 EVK M91 PCB UBX 19056858 R02 7 Board layout Page 15 of 24 ...

Page 16: ... versions may become available during the lifetime of the product you might need to update the ﬁrmware To update the ﬁrmware connect via USB to u center and poll UBX MON VER to view the installed ﬁrmware as shown in Figure 6 Figure 6 Checking EVK M91 ﬁrmware version from u center To upload a new ﬁrmware follow the instructions below UBX 19056858 R02 8 Firmware update Page 16 of 24 ...

Page 17: ... update tool 2 Select the ﬁrmware image by clicking the ellipsis button next to Firmware image 3 Select Use this baudrate for update option and choose a higher baudrate i e 460800 to make the ﬁrmware update faster 4 Click GO 5 Poll UBX MON VER again to verify the updated ﬁrmware UBX 19056858 R02 8 Firmware update Page 17 of 24 ...

Page 18: ... center Only the COM ports that are available on your computer will show up in the COM port drop down list If a COM port is gray another application running on this computer is using it 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...

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 ...

Page 20: ...ut 50 dBHz A low C N0 will result in a prolonged TTFF and more position drift When comparing side by side receivers make sure that all receivers have the same signal levels The best way to achieve this is by using a signal splitter Comparing results measured with diﬀerent antenna types with diﬀerent sensitivity will lead to incorrect conclusions Try to feed the same signal to all receivers in para...

Page 21: ... doc no UBX 18020542 NDA required 6 UBX M9140 KB Interface description doc no UBX 19039383 NDA required 7 NEO M9N Data sheet doc no UBX 19014285 8 NEO M9N Integration manual doc no UBX 19014286 9 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 documentatio...

Page 22: ...232 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 added antenna supervisor part on the block diagram in ﬁgure 4 updated ﬁgure 5 for PCB version B in section 7 Added ﬁrmware update section 8 added glossary in appendix section UBX 19056858 R02 Revision history Page 22 of 24 ...

Page 23: ...trostatic Discharge Galileo European navigation satellite system GLONASS Russian navigation satellite system GND Ground GNSS Global Navigation Satellite System GPS Global Positioning System IEC International Electrotechnical Commission PCB Printed Circuit Board RF Radio frequency UBX u blox QZSS Quasi Zenith Satellite System UBX 19056858 R02 Appendix Page 23 of 24 ...

Page 24: ...us u blox com E mail info_cn u blox com Support support_cn u blox com Regional Oﬃce China Chongqing Phone 86 23 6815 1588 E mail info_cn u blox com Support support_cn u blox com Regional Oﬃce China Shanghai Phone 86 21 6090 4832 E mail info_cn u blox com Support support_cn u blox com Regional Oﬃce China Shenzhen Phone 86 755 8627 1083 E mail info_cn u blox com Support support_cn u blox com Regiona...

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