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MAX-8 / MAX-M8

u-blox 8 / M8 GNSS modules

Hardware Integration Manual



Abstract

This document describes the features and specifications of the u blox MAX-8 / MAX-M8 module
series.

www.u-blox.com

UBX-15030059 - R05

Summary of Contents for MAX-8 Series

Page 1: ...X 8 MAX M8 u blox 8 M8 GNSS modules Hardware Integration Manual Abstract This document describes the features and specifications of the u blox MAX 8 MAX M8 module series www u blox com UBX 15030059 R0...

Page 2: ...ant requirements for RED 2014 53 EU The MAX 8 MAX M8 Declaration of Conformity DoC is available at www u blox com within Support Product resources Conformity Declaration Product name Type number Firmw...

Page 3: ...Detection MAX M8 9 1 6 Electromagnetic interference on I O lines 9 2 Design 10 2 1 Pin description 10 2 1 1 Pin name changes 10 2 2 Minimal design 11 2 3 Layout Footprint and paste mask 11 2 4 Antenn...

Page 4: ...15030059 R05 Page 4 of 31 Production Information 4 2 Soldering 20 4 3 EOS ESD EMI precautions 23 4 4 Applications with cellular modules 26 Appendix 28 A Glossary 28 B Recommended components 28 Related...

Page 5: ...ged if it has been programmed once In order to save backup current a u blox MAX 8C MAX M8C module configured in single crystal mode can have the single crystal feature turned off by means of a SW comm...

Page 6: ...1 In this case VCC_IO supplies power to the RTC and BBR Figure 1 Backup battery and voltage for exact pin orientation see the MAX 8 Data Sheet 1 and MAX M8 Data Sheet 2 Single Crystal feature on MAX 8...

Page 7: ...al communication with an external host CPU The interface only supports operation in slave mode master mode is not supported The DDC protocol and electrical interface are fully compatible with the Fast...

Page 8: ...to supply time or frequency aiding data to the receiver For time aiding hardware time synchronization can be achieved by connecting an accurate time pulse to the EXTINT pin Frequency aiding can be imp...

Page 9: ...erring them as noise into the GNSS receiver This specifically applies to unshielded lines in which the corresponding GND layer is remote or missing entirely and lines close to the edges of the printed...

Page 10: ...RXD 3 I Serial Port UART leave open if not used Voltage level referred VCC_IO System TIMEPULSE 4 O Timepulse Signal Leave open if not used Voltage level referred VCC_IO PIO13 EXTINT 5 I External Inter...

Page 11: ...utside of the module by defining the dimensions of the paste mask to form a T shape or equivalent extending beyond the copper mask For the stencil thickness see section 4 2 Consider the paste mask out...

Page 12: ...the antenna performance Passive antennas do not require a DC bias voltage and can be directly connected to the RF input pin RF_IN Sometimes they may also need a passive matching network to match the i...

Page 13: ...noise amplifier Active antennas require a power supply that will contribute to the total budget of GNSS system power consumption with typically an additional 5 to 20 mA If the supply voltage of the MA...

Page 14: ...configured using serial port UBX binary protocol message Once enabled the active antenna supervisor produces status messages reporting in NMEA and or UBX binary protocol see section 2 4 4 The current...

Page 15: ...ttempts to re establish antenna power are made by default An internal switch under control of the receiver can turn off the supply to the external antenna whenever it is not needed This feature helps...

Page 16: ...e Mode Backup mode Figure 12 External active antenna control MAX 8C Q and M8C Q Figure 13 MAX M8W module design with external supply active antenna for exact pin orientation see the MAX M8 Data Sheet...

Page 17: ...the UBX CFG ANT message This configuration must be sent to the receiver at every startup To enable the Antenna open circuit detection feature the following command must be sent to the receiver at eve...

Page 18: ...ment 1 GND GND GND GND No difference 2 TxD Serial Port TXD Serial Port No difference 3 RxD Serial Port RXD Serial Port No difference 4 TIMEPULSE Timepulse 1PPS TIMEPULSE Timepulse 1PPS No difference 5...

Page 19: ...ANT_ON pin voltage level is with respect to VCC_RF on MAX 8 M8 to VCC_IO only relevant when VCC_IO does not share the same supply with VCC 14 VCC_RF Can be used for active antenna or external LNA supp...

Page 20: ...ould meet the recommendations The quality of the solder joints on the connectors half vias should meet the appropriate IPC specification Reflow soldering A convection type soldering oven is highly rec...

Page 21: ...module Figure 15 Recommended soldering profile u blox 8 M8 modules must not be soldered with a damp heat process Optical inspection After soldering the u blox 8 M8 modules consider an optical inspect...

Page 22: ...encouraged for boards populated with u blox 8 M8 modules Hand soldering Hand soldering is allowed Use a soldering iron temperature setting equivalent to 350 C Place the module precisely on the pads S...

Page 23: ...onductors are more susceptible to thermal overstress The following design guidelines are provided to help in designing robust yet cost effective solutions To avoid overstress damage during production...

Page 24: ...ostatic Discharge ESD Special precautions are required when handling For more robust designs employ additional ESD protection measures Using an LNA with appropriate ESD rating can provide enhanced GNS...

Page 25: ...S receiver or results in unstable performance In addition to EMI degradation due to self jamming see section 1 5 any electronic device near the GNSS receiver can emit noise that can lead to EMI distur...

Page 26: ...f these kinds of filters would be the SAW Filters from Epcos B9444 or B7839 or Murata Increasing interference immunity Jamming signals come from in band and out band frequency sources In band interfer...

Page 27: ...SM CDMA WCDMA Wi Fi BT etc Figure 20 Out band interference signals Measures against out band interference include maintaining a good grounding concept in the design and adding a SAW or band pass ceram...

Page 28: ...e abbreviations and terms used B Recommended components Recommended parts Recommended parts are selected on data sheet basis only Other components may also be used Part Manufacturer Parts ID Remarks P...

Page 29: ...A18SL307V1A45 Array Type For data signals 4 circuits in 1 package Feed thru capacitor Murata NFM18PC NFM21P 0603 2A 0805 4A Rs 0 5 Resistor 10 10 min 0 250 W Rbias 560 5 R2 100 k 5 R3 R4 Table 7 Expla...

Page 30: ...lox M8 FW SPG3 01 Migration Guide Doc No UBX 15028330 For regular updates to u blox documentation and to receive product change notifications register on our homepage www u blox com Revision history R...

Page 31: ...u blox com Regional Office China Beijing Phone 86 10 68 133 545 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...

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