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NEO-M8U - Hardware Integration Manual

UBX-15016700 - R07

Hardware description

Page 9 of 28

Production Information

Figure 3 shows an example of EMI protection measures on the RX/TX line using a ferrite bead. More
information can be found in section 5.3.

Figure 3: EMI Precautions Design

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Summary of Contents for NEO-M8L

Page 1: ...Manual Abstract This document describes the features and specifications of NEO M8U a high performance untethered dead reckoning module with 3D sensors The module includes the u blox M8 concurrent GNSS...

Page 2: ...pean Union regulatory compliance NEO M8U compile with all relevant requirements for RED 2014 53 EU The NEO M8U Declaration of Conformity DoC is available at www u blox com within Support Product resou...

Page 3: ...8 1 5 I O pins 8 1 5 1 Electromagnetic interference on I O lines 8 2 Design 10 2 1 Pin description 10 2 1 1 Pin name changes 11 2 2 Minimal design 11 2 3 Layout Footprint and paste mask 11 12 2 4 Ante...

Page 4: ...NEO M8U Hardware Integration Manual UBX 15016700 R07 Contents Page 4 of 28 Production Information Related documents 27 Revision history 27 Contact 28...

Page 5: ...R Battery Backed RAM then the modified configuration will be retained as long as there is no backup battery supply interrupt For NEO M8U modules the configuration can be saved permanently in SQI flash...

Page 6: ...section 0 1 4 Interfaces 1 4 1 UART NEO M8U 3D dead reckoning module includes a Universal Asynchronous Receiver Transmitter UART serial interface RXD TXD supporting configurable baud rates The baud ra...

Page 7: ...low capacitance ESD protection such as ST Microelectronics USBLC6 2 R4 R5 Serial termination resistors Establish a full speed driver impedance of 28 44 A value of 27 is recommended R11 Resistor 100 k...

Page 8: ...N signal in order to optimize power consumption TIMEPULSE A configurable time pulse signal is available with the NEO M8U module It generates pulse trains synchronized with GPS or UTC time grid with in...

Page 9: ...15016700 R07 Hardware description Page 9 of 28 Production Information Figure 3 shows an example of EMI protection measures on the RX TX line using a ferrite bead More information can be found in sect...

Page 10: ...lt 5 USB_DM I O USB Data 6 USB_DP I O USB Data 7 VDD_USB I USB Supply 8 RESET_N I RESET_N 9 VCC_RF O Output Voltage RF section 10 GND I Ground 11 RF_IN I GNSS signal input 12 GND I Ground 13 GND I Gro...

Page 11: ...anges in NEO M8U 2 2 Minimal design This is a minimal design for a NEO M8U GNSS receiver Figure 4 NEO M8U passive antenna design Use series resistors in the UART lines to avoid electromagnetic interfe...

Page 12: ...re with 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 mat...

Page 13: ...ls 2 4 2 Active antenna design An active antenna makes use of an integrated low noise amplifier which requires a power supply that will contribute to the total GNSS system power consumption budget wit...

Page 14: ...esign Page 14 of 28 Production Information Active antenna design powered from an external supply Figure 9 Active antenna design direct external supply The circuit shown in Figure 9 works with all u bl...

Page 15: ...benefits of dead reckoning are available once the receiver has completed its initialization phase following installation Initialization parameter values are subsequently stored in the battery backed R...

Page 16: ...t RF_IN GNSS signal input No difference 12 GND GND GND GND No difference 13 GND GND GND GND No difference 14 LNA_EN1 Used to turn on and off an optional external LNA LNA_EN Used to turn on and off an...

Page 17: ...the connectors half vias should meet the appropriate IPC specification Reflow soldering A convection type soldering oven is highly recommended over the infrared type radiation oven Convection heated...

Page 18: ...ldering the NEO M8U module consider an optical inspection step to check that The module is properly aligned and centered over the pads All pads are properly soldered No excess solder has created conta...

Page 19: ...l fixture soldering e g pins 1 and 15 and then continue from left to right Rework The NEO M8U module can be unsoldered from the baseboard using a hot air gun When using a hot air gun for unsoldering t...

Page 20: ...g robust yet cost effective solutions To avoid overstress damage during production or in the field it is essential to observe strict EOS ESD EMI handling and protection measures To prevent overstress...

Page 21: ...se an ESD safe soldering iron tip Failure to observe these precautions can result in severe damage to the GNSS module ESD protection measures GNSS positioning modules are sensitive to Electrostatic Di...

Page 22: ...propriate ESD rating and maximum input power GNSS Band pass Filter SAW or Ceramic with low insertion loss and appropriate ESD rating Figure 13 EOS and ESD Precautions Electromagnetic interference EMI...

Page 23: ...inds of filters would be the SAW Filters from Epcos B9444 or B7839 or Murata Increasing interference immunity Interference signals come from in band and out band frequency sources In band interference...

Page 24: ...DMA WCDMA Wi Fi BT etc Figure 16 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 ceramic f...

Page 25: ...BeiDou Low insertion loss Only for mobile application SAFEA1G58KB0F00 GPS GLONASS Low insertion loss only for mobile application SAFEA1G58KA0F00 GPS GLONASS High attenuation only for mobile applicati...

Page 26: ...111 36 36 3 mm 1 8 to 5 5V 10mA at 3V active INPAQ www inpaq com tw B3G02G S3 01 A 2 7 to 3 9 V 10 mA active Amotech www amotech co kr B35 3556920 2J2 35x35x3 mm GPS GLONASS passive Amotech www amotec...

Page 27: ...o u blox documentation and to receive product change notifications register on our homepage www u blox com Revision history Revision Date Name Comments R01 29 Feb 2015 jfur Objective Specification R02...

Page 28: ...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 Su...

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