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EVA-M8M
u-blox M8 concurrent GNSS modules
Hardware Integration Manual
Abstract
This document describes the hardware features and specifications of
the cost effective EVA-M8M concurrent GNSS modules featuring
the u-blox M8 positioning engine.
The EVA-M8M series boasts the industry's smallest form factor and
is a fully tested standalone solution that requires no host
integration.
The EVA-M8M modules combine exceptional GNSS performance
with highly flexible power, design, and serial communication
options.
www.u-blox.com
UBX-14006179 - R01
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Summary of Contents for Ublox EVA-M8M
- Page 1 This document describes the hardware features and specifications of the cost effective EVA-M8M concurrent GNSS modules featuring the u-blox M8 positioning engine. The EVA-M8M series boasts the industry’s smallest form factor and is a fully tested standalone solution that requires no host integration.
- Page 2 EVA-M8M - Hardware Integration Manual Document Information Title EVA-M8M Subtitle u-blox M8 concurrent GNSS modules Document type Hardware Integration Manual Document number UBX-14006179 Revision and date 30-Sep-2014 Document status Advance Information Document status explanation Objective Specification Document contains target values. Revised and supplementary data will be published later.
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Page 3: Preface
GPS system functionalities and technology. • Receiver Description including Protocol Specification: This document describes messages, configuration and functionalities of the EVA-M8M software releases and receivers. • Hardware Integration Manuals: These manuals provide hardware design instructions and information on how to set up production and final product tests. -
Page 4: Table Of Contents
Safe Boot Mode (SAFEBOOT_N pin) ....................17 RESET_N ............................. 17 Design-in checklist ..........................18 2.8.1 General considerations ........................ 18 2.8.2 Schematic design-in for EVA-M8M ....................18 Pin description ............................ 19 2.10 Layout design-in checklist ....................... 20 2.11 Layout ............................. 20 2.11.1... - Page 5 EVA-M8M - Hardware Integration Manual 2.12 Migration considerations ......................... 22 2.12.1 C88-M8M - Evaluating EVA-M8M on existing NEO-xM sockets ........... 22 2.13 EOS/ESD/EMI precautions ........................ 24 2.13.1 Electrostatic Discharge (ESD) ......................24 2.13.2 ESD protection measures ......................24 2.13.3 Electrical Overstress (EOS) ......................24 2.13.4...
- Page 6 EVA-M8M - Hardware Integration Manual USB line protection (D1) ........................40 USB LDO (U2) ............................. 40 External LNA (U1) ..........................40 Optional SQI Flash (U3) ........................41 RF ESD protection diode (D2) ......................41 Operational amplifier (U6) ........................41 B.10 Open-drain buffer (U4, U7 and U8) ....................
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Page 7: Hardware Description
EVA form factor. The EVA-M8M series is an ideal solution for cost and space-sensitive applications. It is easy to design-in, only requiring an external GNSS antenna in most applications. The layout of the EVA-M8M modules is especially designed to ease the customer’s design and limit near field interferences since RF and digital domains are kept... -
Page 8: Design-In
The different supply voltages are explained in the following subsections. Figure 1 shows an example to supply the EVA-M8M modules when not using the USB interface. In this case, the V_USB pin is connected to ground. -
Page 9: Power Management Configuration
2.1.1.1 Main supply voltage (VCC) During operation, the EVA-M8M modules are supplied through the VCC pin. It makes use of an internal DC/DC converter for improved power efficiency. In a following step, built-in LDOs generate stabilized voltages for the Core and RF domains of the chip respectively. The current at VCC depends heavily on the current state of the system and is in general very dynamic. -
Page 10: Interfaces
EVA-M8M Data Sheet [1]. To make use of DDC interface the D_SEL pin has to be left open. The EVA-M8M DDC interface provides serial communication with u-blox cellular modules. See the specification of the applicable cellular module to confirm compatibility. -
Page 11: Spi Interface
To make use of the SPI interface, the D_SEL pin has to be connected to GND. 2.2.4 USB interface The USB interface of the EVA-M8M modules support the full-speed data rate of 12 Mbit/s. It is compatible to the USB 2.0 FS standard. The interface requires some external components in order to implement the physical characteristics required by the USB 2.0 specification. -
Page 12: Sqi Flash Memory
The VCC_IO monitor threshold (iomonCfg) must be set according to the SQI supply voltage level (VCC_IO). When using a 3.0 V or a 3.3 V flash memory device send one of the following sequences to the EVA-M8M receiver in production: B5 62 06 41 0C 00 00 00 03 1F 20 EC 68 C6 FE 7F FE FF 29 3E (for a 3.0 V Flash memory) -
Page 13: I/O Pins
EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC_IO (see the EVA-M8M Data Sheet [1] for more information). It can be used for wake-up functions in Power Save Mode on all u-blox M8 modules and for aiding. Leave open if unused; its function is disabled by default. By default the external interrupt is disabled. -
Page 14: Electromagnetic Interference On I/O Lines
AssistNow Autonomous, AssistNow Offline and in some Power Save Mode operations. The time information can either be generated by connecting an external RTC crystal to the EVA-M8M modules, by deriving the RTC from the internal crystal oscillator, by connecting an external 32.768 kHz signal to the RTC input, or by time aiding of the GNSS receiver at every startup. -
Page 15: Rtc Using A Crystal
2.4.4 Time aiding Time can also be sent by UBX message at every startup of the EVA-M8M modules. This can be done to enable warm starts, AssistNow Autonomous and AssistNow Offline. This can be done when no RTC is maintained. -
Page 16: Active Antenna
2.5.1 Active Antenna In case an active antenna is used, just the active antenna supply circuit has to be added in front of the EVA-M8M modules RF-input, see Figure 16. In case the active antenna has to be supervised, either the 2-pin active antenna supervisor circuit (see Figure 19) or the 3-pin active antenna supervisor circuit (see Figure 20), has to be added to the active antenna circuit. -
Page 17: Safe Boot Mode (Safeboot_N Pin)
Safe Boot Mode (SAFEBOOT_N pin) If the SAFEBOOT_N pin is “low” at start up, the EVA-M8M series starts in Safe Boot Mode and doesn’t begin GNSS operation. In Safe Boot Mode the EVA-M8M series runs from an internal LC oscillator and starts regardless of any configuration provided by the configuration pins. -
Page 18: Design-In Checklist
The total noise figure including external LNA (or the LNA in the active antenna) should be around 1 dB. With the EVA-M8M series, an external LNA is mandatory if no active antenna is used to achieve the performance values as written in the EVA-M8M Data Sheet [1]. -
Page 19: Pin Description
VCC_IO I/O Supply See section 2.1. V_USB USB Interface power Connect to GND if not used. Table 5: EVA-M8M pin description For pin assignment see the EVA-M8M Data Sheet [1]. UBX-14006179 - R01 Advance Information Design-in Page 19 of 45... -
Page 20: Layout Design-In Checklist
Is the grounding concept optimal? Has the 50 Ohm line from antenna to EVA-M8M (micro strip / coplanar waveguide) been kept as short as possible? Assure low serial resistance in VCC power supply line (choose a line width > 400 um). -
Page 21: Footprint
EVA-M8M - Hardware Integration Manual 2.11.1 Footprint Pin36 Pin1 Figure 5: Recommended footprint (bottom view) Units are in mm. 2.11.2 Paste mask The paste mask shall be 50 µm smaller than the copper pads with a paste thickness of 100 µm. -
Page 22: Migration Considerations
EVA-M8M - Hardware Integration Manual 2.12 Migration considerations EVA-M8M series is the successor of the EVA-7M. u-blox is committed to ensuring that products in the same form factor are backwards compatible over several technology generations. Utmost care has been taken to ensure there is no negative impact on function or performance and to make u-blox M8 modules as fully compatible as possible with u-blox 7 versions. - Page 23 RF_IN GPS signal input RF_IN GPS signal input to achieve the performance values shown in the EVA-M8M Data Sheet [1]. The Noise Figure of the C88-M8M is about 2 dB higher than NEO- No difference No difference MOSI/ SPI MOSI / Configuration Different functions.
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Page 24: Eos/Esd/Emi Precautions
To prevent overstress damage at the RF_IN of your receiver, never exceed the maximum input power as specified in the EVA-M8M Data Sheet [1]. 2.13.1 Electrostatic Discharge (ESD) Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at different electrical potentials caused by direct contact or induced by an electrostatic field. -
Page 25: Eos Protection Measures
EVA-M8M - Hardware Integration Manual 2.13.4 EOS protection measures EOS protection measures as shown in Figure 7 are recommended for any designs combining wireless communication transceivers (e.g. GSM, GPRS) and GNSS in the same design or in close proximity. Passive antennas... - Page 26 EVA-M8M - Hardware Integration Manual Figure 9: In-band interference sources Measures against in-band interference include: • Maintaining a good grounding concept in the design • Shielding • Layout optimization • Filtering • Placement of the GNSS antenna • Adding a CDMA, GSM, WCDMA bandbass filter before handset antenna 2.13.5.4 Out-band interference...
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Page 27: Product Handling & Soldering
Packaging, shipping, storage and moisture preconditioning For information pertaining to reels and tapes, Moisture Sensitivity levels (MSD), shipment and storage information, as well as drying for preconditioning see the EVA-M8M Data Sheet [1] . ESD handling precautions ESD prevention is based on establishing an Electrostatic Protective Area (EPA). The EPA can be a small working station or a large manufacturing area. -
Page 28: Reflow Soldering
Casting will void the warranty. 3.3.9 Use of ultrasonic processes Some components on the EVA-M8M modules are sensitive to Ultrasonic Waves. Use of any Ultrasonic Processes (cleaning, welding etc.) may cause damage to the GNSS Receiver. u-blox offers no warranty against damages to the EVA-M8M modules caused by any Ultrasonic Processes. -
Page 29: Product Testing
EVA-M8M - Hardware Integration Manual 4 Product testing Test parameters for OEM manufacturer Because of the testing done by u-blox, it is obvious that an OEM manufacturer doesn’t need to repeat firmware tests or measurements of the GNSS parameters/characteristics (e.g. TTFF) in their production test. -
Page 30: Appendix
EVA-M8M - Hardware Integration Manual Appendix A Reference schematics A.1 Cost optimized circuit • Passive Antenna • No RTC crystal • No backup battery • UART and DDC for communication to host Figure 13: Cost optimized circuit UBX-14006179 - R01... -
Page 31: Best Performance Circuit With Passive Antenna
EVA-M8M - Hardware Integration Manual A.2 Best performance circuit with passive antenna • External LNA • RTC crystal • Backup battery • UART and DDC for communication to host Figure 14: Best performance circuit UBX-14006179 - R01 Advance Information Appendix... -
Page 32: Improved Jamming Immunity With Passive Antenna
EVA-M8M - Hardware Integration Manual A.3 Improved jamming immunity with passive antenna • External SAW filter – LNA – SAW filter • RTC crystal • Backup battery • UART and DDC for communication to host Figure 15: Standard circuit for an improved jamming immunity... -
Page 33: Circuit Using Active Antenna
EVA-M8M - Hardware Integration Manual A.4 Circuit using active antenna • Active antenna • RTC crystal • Backup battery • UART and DDC for communication to host Figure 16: Standard circuit using active antenna UBX-14006179 - R01 Advance Information Appendix... -
Page 34: Usb Self-Powered Circuit With Passive Antenna
EVA-M8M - Hardware Integration Manual A.5 USB self-powered circuit with passive antenna • External LNA • RTC crystal • Backup battery • UART and DDC for communication to host • USB interface Figure 17: USB self-powered circuit UBX-14006179 - R01... -
Page 35: Usb Bus-Powered Circuit With Passive Antenna
EVA-M8M - Hardware Integration Manual A.6 USB bus-powered circuit with passive antenna • External LNA • RTC crystal • Backup battery • SPI for communication to host • USB interface Figure 18: USB bus-powered circuit UBX-14006179 - R01 Advance Information... -
Page 36: Circuit Using 2-Pin Antenna Supervisor
EVA-M8M - Hardware Integration Manual A.7 Circuit using 2-pin antenna supervisor • 2-pin antenna supervisor • RTC crystal • Backup battery • UART and DDC for communication to host Figure 19: Circuit using 2-pin antenna supervisor UBX-14006179 - R01 Advance Information... -
Page 37: Circuit Using 3-Pin Antenna Supervisor
EVA-M8M - Hardware Integration Manual A.8 Circuit using 3-pin antenna supervisor • 3-pin antenna supervisor • RTC crystal • Backup battery • UART and DDC for communication to host Figure 20: Circuit using 3-pin antenna supervisor UBX-14006179 - R01 Advance Information... -
Page 38: Design-In Recommendations In Combination With Cellular Operation
EVA-M8M - Hardware Integration Manual A.9 Design-in Recommendations in combination with cellular operation Cellular and GNSS Product Receiver Chain Simultaneous operation Passive GNSS Active GNSS Antenna Antenna • • MAX-6 • • NEO-6 •... -
Page 39: B Component Selection
EVA-M8M - Hardware Integration Manual B Component selection This section provides information about components that are critical for the performance of the EVA-M8M GNSS receiver module. Recommended parts are selected on a data sheet basis only. Temperature range specifications need only be as wide as required by a particular application. For the purpose of this document, specifications for industrial temperature range (-40 C …... -
Page 40: External Lna Protection Filter (F2)
EVA-M8M - Hardware Integration Manual B.3 External LNA protection filter (F2) Depending on the application circuit, consult manufacturer data sheet for DC, ESD and RF power ratings! Manufacturer Order No. System supported Comments TDK/ EPCOS B8401: B39162-B8401-P810 GPS+GLONASS High attenuation... -
Page 41: Optional Sqi Flash (U3)
EVA-M8M - Hardware Integration Manual B.7 Optional SQI Flash (U3) Manufacturer Order No. Comments Macronix MX25U8035E 1.8V, 8Mbit, several package/temperature options Macronix MX25U1635E 1.8V, 16Mbit, several package/temperature options Macronix MX25L3239E 3V, 32Mbit, several package/temperature options Spansion S25FL116K 3V, 16Mbit, several package/temperature options... -
Page 42: Feed-Thru Capacitors
EVA-M8M - Hardware Integration Manual B.13 Feed-thru capacitors Manufacturer Order No. Comments MuRata NFL18SP157X1A3 For data signals, 34 pF load capacitance MuRata NFA18SL307V1A45 For data signals, 4 circuits in 1 package MuRata NFM18PC474R0J3 For power supply < 2 A, size 0603... -
Page 43: Appendix
EVA-M8M - Hardware Integration Manual Appendix C Glossary Abbreviation Definition ANSI American National Standards Institute BeiDou Chinese satellite navigation system CDMA Code Division Multiple Access Electromagnetic interference Electrical Overstress Electrostatic Protective Area Electrostatic discharge GLONASS Russian satellite system Ground GNSS... -
Page 44: Related Documents
EVA-M8M - Hardware Integration Manual Related documents EVA-M8M Data Sheet, Docu. No. UBX-14015058 u-blox M8 Receiver Description Including Protocol Specification (Public version), Docu. No. UBX-13003221 GPS Antenna Application Note, Docu. No. GPS-X-08014 GPS Compendium, Docu. No. GPS-X-02007 GPS Implementation and Aiding Features in u-blox wireless modules, Docu. No. GSM.G1-CS-09007 u-blox 7 to u-blox M8 Software Migration Guide, Docu. -
Page 45: Contact
EVA-M8M - Hardware Integration Manual Contact For complete contact information, visit us at www.u-blox.com u-blox Offices North, Central and South America Headquarters Asia, Australia, Pacific Europe, Middle East, Africa u-blox America, Inc. u-blox Singapore Pte. Ltd. u-blox AG Phone: +1 703 483 3180...
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