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EVA-8M and EVA-M8 series - Hardware Integration Manual

UBX-16010593 - R06

Appendix

Page 38 of 47

Early Production Information

A.6

USB bus-powered circuit with passive antenna

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External LNA

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RTC crystal

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Backup battery

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SPI for communication to host

•

USB interface

Figure 18: USB bus-powered circuit

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Summary of Contents for EVA-8M Series

Page 1: ...of u blox EVA 8M and EVA M8 series GNSS modules The EVA series modules boast the industry s smallest form factor and are a fully tested standalone solution that requires no host integration The EVA 8...

Page 2: ...14 53 EU The EVA 8M and EVA M8M Q Declaration of Conformity DoC is available at www u blox com within Support Product resources Conformity Declaration This document applies to the following products P...

Page 3: ...3 3 Active antenna supervisor 13 2 3 4 Electromagnetic interference and I O lines 14 2 4 Real Time Clock RTC 15 2 4 1 RTC using a crystal 15 2 4 2 RTC derived from the system clock single crystal feat...

Page 4: ...ow soldering 31 3 3 3 Optical inspection 31 3 3 4 Repeated reflow soldering 31 3 3 5 Wave soldering 31 3 3 6 Rework 31 3 3 7 Use of ultrasonic processes 31 4 Product testing 32 4 1 Test parameters for...

Page 5: ...lash U3 43 B 8 RF ESD protection diode D2 43 B 9 Operational amplifier U6 43 B 10Open drain buffer U4 U7 and U8 43 B 11Antenna supervisor switch transistor T1 44 B 12Ferrite beads FB1 44 B 13Feed thru...

Page 6: ...EVA M8M 0 defaults to GPS QZSS GLONASS and fits global applications whereas EVA M8M 1 defaults to GPS QZSS BeiDou making it the ideal module for China The right satellite constellations can be selecte...

Page 7: ...passive antenna is used With EVA M8Q module an additional external LNA is recommended with passive antenna 2 1 Power management 2 1 1 Overview The EVA 8M EVA M8 series GNSS modules provide four suppl...

Page 8: ...kup power supply V_BCKP In the event of a power failure at VCC_IO the backup domain is supplied by V_BCKP If no backup supply is available connect V_BCKP to VCC_IO Avoid high resistance on the V_BCKP...

Page 9: ...d to indicate that data is ready to be transmitted The TXD Ready signal indicates that the receiver has data to transmit Each TXD Ready signal is associated with a particular interface and cannot be s...

Page 10: ...ts in order to implement the physical characteristics required by the USB 2 0 specification Figure 2 shows the interface pins and additional external components In order to comply with USB specificati...

Page 11: ...5 and Appendix A 6 for reference schematics for self and bus powered operation If the USB interface is not used connect VDD_USB to GND 2 2 5 SQI Flash memory An external SQI Serial Quad Interface Flas...

Page 12: ...06 41 0C 00 00 00 03 1F 04 BA CF 67 FF 7F FF FF E5 95 If VCC_IO voltage 3 0 V to 3 6 V is used send the following sequence to the module B5 62 06 41 0C 00 00 00 03 1F 4F 22 4C 5C FF 7F 7F FF 8A 7C Ap...

Page 13: ...VA 8M EVA M8 series GNSS modules support active antenna supervisors The antenna supervisor gives information about the status of the active antenna and will turn off the supply to the active antenna i...

Page 14: ...y the UBX MON HW message More information see the u blox 8 u blox M8 Receiver Description Including Protocol Specification 3 The open drain buffers U4 U7 and U8 e g Fairchild NC7WZ07 are needed to shi...

Page 15: ...om the system clock single crystal feature The crystal based EVA 8M EVA M8M GNSS modules can be configured in such way that the reference frequency for the RTC is internally derived from the 26 MHz cr...

Page 16: ...F front end architecture two GNSS signals GPS L1C A GLONASS L1OF Galileo E1B C and BeiDou B1 can be received and processed concurrently This concurrent operation is extended to 3 GNSS when GPS and Gal...

Page 17: ...sive antenna and external LNA LNA1 might not be necessary This results in a better noise figure than an additional SAW filter F2 in front of the external LNA U1 If the EVA 8M EVA M8 series GNSS module...

Page 18: ...e voltage VDD_USB voltage within the specified range Do you have a Bus or Self powered setup Compare the peak current consumption of EVA 8M EVA M8 series GNSS modules with the specification of your po...

Page 19: ...Reserved Do not connect Must be left open 11 Reserved I O Reserved Do not connect Must be left open 12 PIO14 ANT_DET I Antenna detection Leave open if not used 13 PIO13 EXTINT I External interrupt Le...

Page 20: ...ble below lists those pins along with their old and new names No Previous Name New name 7 V_USB VDD_USB 15 RX MOSI RXD SPI MOSI 16 TX MISO TXD SPI MISO 26 SQI_CS SQI_CS_N 29 SCL SCK SCL SPI CLK 30 SDA...

Page 21: ...t exceed 5 times the track width of the micro strip use the Coplanar Waveguide model in AppCad to calculate the micro strip and not the micro strip model 2 11 Layout This section provides important in...

Page 22: ...been taken to ensure there is no negative impact on function or performance and to make u blox 8 u blox M8 modules as fully compatible as possible with u blox 7 versions If using BeiDou check the band...

Page 23: ...e supply EVA 8M EVA M8M 1 65 3 6V No difference EVA M8Q 2 7 3 6V Note EVA M8Q has a higher voltage range 20 VCC_IO Supply voltage for PIOs EVA 7M 1 65 3 6V VCC_IO Supply voltage for PIOs EVA 8M EVA M8...

Page 24: ...cts based on the u blox NEO GNSS modules It enables fast verification of the EVA M8M functionalities and performances before the design in Schematic of C88 M8M is available upon request Pin NEO 6M C88...

Page 25: ...RxD Serial Port RxD Serial Port SPI MOSI No difference for UART If pin 2 low SPI MOSI 22 V_BCKP Backup supply voltage V_BCKP Backup supply voltage No difference 23 VCC Supply voltage VCC Supply volta...

Page 26: ...ive antenna patches or external antenna connection points then additional ESD measures as shown in Figure 6 can also avoid failures in the field Passive antennas Active Antennas A B LNA with appropria...

Page 27: ...shielded PCB lines connected to the GNSS receiver Place the resistor as close as possible to the GNSS receiver pin Alternatively feed thru capacitors with good GND connection can be used to protect e...

Page 28: ...Pow er dBm GPS input filter characteristics 1575 1600 0 Interference signal GPS signals GPSCarrier 1575 4 M Hz Figure 8 In band interference signals Figure 9 In band interference sources Measures aga...

Page 29: ...igure 10 Out band interference signals Measures against out band interference include maintaining a good grounding concept in the design and adding a SAW or bandpass ceramic filter as recommend in sec...

Page 30: ...addition to standard ESD safety practices the following measures should be taken into account whenever handling the receiver Unless there is a galvanic coupling between the local GND i e the work tab...

Page 31: ...EVA M8 series GNSS modules must not be soldered with a damp heat process 3 3 3 Optical inspection After soldering the modules consider an optical inspection step to check whether The module is properl...

Page 32: ...ent Communications Positioning Technology www positioningtechnology co uk Figure 12 Multi GNSS generator 4 2 1 Guidelines for sensitivity tests 1 Connect a Multi GNSS generator to the OEM product 2 Ch...

Page 33: ...l UBX 16010593 R06 Appendix Page 33 of 47 Early Production Information Appendix A Reference schematics A 1 Cost optimized circuit Passive Antenna No RTC crystal No backup battery UART and DDC for comm...

Page 34: ...on Manual UBX 16010593 R06 Appendix Page 34 of 47 Early Production Information A 2 Best performance circuit with passive antenna External LNA RTC crystal Backup battery UART and DDC for communication...

Page 35: ...06 Appendix Page 35 of 47 Early Production Information A 3 Improved jamming immunity with passive antenna External SAW filter LNA SAW filter RTC crystal Backup battery UART and DDC for communication t...

Page 36: ...ion Manual UBX 16010593 R06 Appendix Page 36 of 47 Early Production Information A 4 Circuit using active antenna Active antenna RTC crystal Backup battery UART and DDC for communication to host Figure...

Page 37: ...al UBX 16010593 R06 Appendix Page 37 of 47 Early Production Information A 5 USB self powered circuit with passive antenna External LNA RTC crystal Backup battery UART and DDC for communication to host...

Page 38: ...n Manual UBX 16010593 R06 Appendix Page 38 of 47 Early Production Information A 6 USB bus powered circuit with passive antenna External LNA RTC crystal Backup battery SPI for communication to host USB...

Page 39: ...UBX 16010593 R06 Appendix Page 39 of 47 Early Production Information A 7 Circuit using 2 pin antenna supervisor 2 pin antenna supervisor RTC crystal Backup battery UART and DDC for communication to h...

Page 40: ...UBX 16010593 R06 Appendix Page 40 of 47 Early Production Information A 8 Circuit using 3 pin antenna supervisor 3 pin antenna supervisor RTC crystal Backup battery UART and DDC for communication to h...

Page 41: ...ystal CC7V T1A 32 768 kHz 7 0 pF 100 ppm Table 11 Recommend parts list for RTC crystal B 2 RF band pass filter F1 Depending on the application circuit consult manufacturer data sheet for DC ESD and RF...

Page 42: ...A1G58KA0F00 GPS GLONASS High attenuation only for mobile application muRata SAFFB1G58KA0F0A GPS GLONASS High attenuation only for mobile application muRata SAFFB1G58KB0F0A GPS GLONASS Low insertion lo...

Page 43: ...25FL132K All 3V 32 Mbit several package temperature options Winbond W25Q16FW EVA M8M 1 8V 16 Mbit several package temperature options EVA 8M 1 8V 16 Mbit several package temperature options Winbond W2...

Page 44: ...n 1 package MuRata NFM18PC474R0J3 For power supply 2 A size 0603 MuRata NFM21PC474R1C3 For power supply 4 A size 0805 Table 24 Recommend parts list for feed thru capacitors B 14 Inductor L1 Manufactur...

Page 45: ...Standard resistors C Glossary Abbreviation Definition ANSI American National Standards Institute BeiDou Chinese satellite navigation system CDMA Code Division Multiple Access EMI Electromagnetic inter...

Page 46: ...09 Feb 2017 jesk Early Production Information Updated information about EVA M8Q VCC VCC_IO and V_BCKP voltage ranges updated eFuse configuration messages updated section 2 2 4 and Figure 2 USB interf...

Page 47: ...upport_ap 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...

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