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EVA-7M
u-blox 7 GNSS module
Hardware Integration Manual
Abstract
This document describes the hardware features and specifications of
the cost effective EVA-7M GNSS module featuring the u-blox 7
positioning engine.
The EVA-7M module boasts the industry's smallest form factor and
is a fully tested standalone solution that requires no host
integration.
This module combines exceptional GNSS performance with highly
flexible power, design, and serial communication options.
www.u-blox.com
UBX-12003235 - R05
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Table of Contents
Related Manuals for Ublox EVA-7M
Summary of Contents for Ublox EVA-7M
- Page 1 Hardware Integration Manual Abstract This document describes the hardware features and specifications of the cost effective EVA-7M GNSS module featuring the u-blox 7 positioning engine. The EVA-7M module boasts the industry’s smallest form factor and is a fully tested standalone solution that requires no host integration.
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Page 2: Document Information
EVA-7M - Hardware Integration Manual Document Information Title EVA-7M Subtitle u-blox 7 GNSS module Document type Hardware Integration Manual Document number UBX-12003235 Revision and date 30-Jan-2015 Document status Production Information Document status explanation Objective Specification Document contains target values. Revised and supplementary data will be published later. -
Page 3: Table Of Contents
2.10.2 Paste mask ..........................19 2.10.3 Placement ........................... 19 2.11 Migration considerations ......................... 19 2.11.1 C88-7M - Evaluating EVA-7M on existing NEO-xM sockets ............19 2.12 EOS/ESD/EMI precautions ........................ 21 UBX-12003235 - R05 Production Information Contents Page 3 of 42... - Page 4 EVA-7M - Hardware Integration Manual 2.12.1 Abbreviations ..........................21 2.12.2 Electrostatic Discharge (ESD) ......................21 2.12.3 ESD protection measures ......................22 2.12.4 Electrical Overstress (EOS) ......................22 2.12.5 EOS protection measures ......................22 2.12.6 Applications with cellular modules ....................23 Product handling &...
- Page 5 EVA-7M - Hardware Integration Manual RF ESD protection diode (D2) ......................39 Operational amplifier (U6) ........................39 Open-drain buffer (U4, U7 and U8) ....................39 B.10 Antenna supervisor switch transistor (T1) ..................39 B.11 Ferrite beads (FB1) .......................... 39 B.12 Feed-thru capacitors ........................
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Page 6: Hardware Description
EVA form factor. The EVA-7M 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‑7M is especially designed to ease the customer’s design and limit near field interferences since RF and digital domains are kept separated. -
Page 7: Design-In
The different supply voltages are explained in the following subsections. Figure 1 shows an example to supply the EVA-7M module when not using the USB interface. In this case, the V_USB pin is connected to ground. -
Page 8: Power Management Configuration
I/O supply voltage (VCC_IO) The digital I/Os of the EVA-7M can be supplied with a separate voltage from the host system connected to the VCC_IO pin of the module. The wide range of VCC_IO allows seamless interfacing to standard logic voltage levels. -
Page 9: Interfaces
EVA-7M Data Sheet [1]. To make use of DDC interface the D_SEL pin has to be left open. The EVA-7M DDC interface provides serial communication with u-blox wireless modules. See the specification of the applicable wireless module to confirm compatibility. -
Page 10: Usb Interface
ON/OFF operation and SW backup mode because of its internal pull-up resistor. 2.2.4 USB interface The USB interface of the EVA-7M supports 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 11: I/O Pins
2.3.2 External interrupt EXTINT is an external interrupt pin with fixed input voltage thresholds with respect to VCC_IO (see the EVA-7M Data Sheet [1] for more information). It can be used for wake-up functions in Power Save Mode on all u-blox 7 modules and for aiding. -
Page 12: 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-7M, 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 13: Rtc Derived From The System Clock
B.1. 2.4.4 Time aiding Time can also be sent by UBX message at every startup of the EVA-7M. This can be done to enable warm starts, AssistNow Autonomous and AssistNow Offline. This can be done when no RTC is maintained. -
Page 14: Passive Antenna
2.5.2 Passive Antenna If a passive antenna is connected to the EVA-7M, it is mandatory to use an additional LNA in front of EVA-7M to achieve the performance values as written in the EVA-7M Data Sheet [1] , see Appendix A. An LNA (U1) alone... -
Page 15: Design-In Checklist
With EVA-7M, an external LNA is mandatory if no active antenna is used to achieve the performance values as written in the EVA-7M Data Sheet [1]. Make sure the antenna is not placed close to noisy parts of the circuitry and not facing noisy parts. (E.g. -
Page 16: 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-7M pin description For pin assignment see the EVA-7M Data Sheet [1]. UBX-12003235 - R05 Production Information Design-in Page 16 of 42... -
Page 17: Layout Design-In Checklist
Is the grounding concept optimal? Has the 50 Ohm line from antenna to EVA-7M (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 18: Footprint
EVA-7M - Hardware Integration Manual 2.10.1 Footprint Pin36 Pin1 Figure 6: Recommended footprint (bottom view) Units are in mm. UBX-12003235 - R05 Production Information Design-in Page 18 of 42... -
Page 19: Paste Mask
2.11 Migration considerations EVA-7M modules are targeted to be the successor of AMY-6M. However, both modules make use of a different package. As a consequence a layout for AMY-6M cannot be directly migrated to EVA-7M and must be modified. - Page 20 RF_IN GPS signal input RF_IN GPS signal input achieve the performance values shown in the EVA-7M Data Sheet [1]. The Noise Figure of the C88-7M is about 2 dB higher than NEO-6M. No difference No difference SPI MOSI / Configuration Different functions.
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Page 21: Eos/Esd/Emi Precautions
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 damage at the RF_IN of your receiver, never exceed the maximum input power as specified in the EVA-7M Data Sheet [1]. 2.12.1 Abbreviations Abbreviation... -
Page 22: Esd Protection Measures
EVA-7M - Hardware Integration Manual 2.12.3 ESD protection measures GNSS receivers are sensitive to Electrostatic Discharge (ESD). Special precautions are required when handling. Most defects caused by ESD can be prevented by following strict ESD protection rules for production and handling. -
Page 23: Applications With Cellular Modules
EVA-7M - Hardware Integration Manual 2.12.6 Applications with cellular modules GSM uses power levels up to 2W (+33dBm). Make sure that absolute maximum input power level of GNSS receiver is not exceeded. See the GPS Implementation and Aiding Features in u-blox wireless modules [5]. - Page 24 EVA-7M - Hardware Integration Manual 2.12.6.4 Out-band interference Out-band interference is caused by signal f Figure 9 requencies that are different from the GNSS carrier (see ). The main sources are wireless communication systems such as GSM, CDMA, WCDMA, WiFi, BT, etc.
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Page 25: Product Handling & Soldering
3.1 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-7M Data Sheet [1] . 3.2 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 26: Reflow Soldering
Not recommended. 3.3.7 Use of ultrasonic processes Some components on the EVA-7M module 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-7M module caused by any Ultrasonic Processes. -
Page 27: Product Testing
EVA-7M - Hardware Integration Manual 4 Product testing 4.1 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 28: Appendix
UART and DDC for communication to host Figure 14: Cost optimized circuit To achieve the performance values as written in the EVA-7M Data Sheet [1] either use an active antenna or add an LNA+SAW between the passive antenna and RF_IN pin. -
Page 29: Best Performance Circuit With Passive Antenna
EVA-7M - 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 15: Best performance circuit UBX-12003235 - R05 Production Information Appendix... -
Page 30: Improved Jamming Immunity With Passive Antenna
EVA-7M - 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 16: Standard circuit for an improved jamming immunity... -
Page 31: Circuit Using Active Antenna
EVA-7M - Hardware Integration Manual A.4 Circuit using active antenna • Active antenna • RTC crystal • Backup battery • UART and DDC for communication to host Figure 17: Standard circuit using active antenna UBX-12003235 - R05 Production Information Appendix... -
Page 32: Usb Self-Powered Circuit With Passive Antenna
EVA-7M - 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 18: USB self-powered circuit UBX-12003235 - R05... -
Page 33: Usb Bus-Powered Circuit With Passive Antenna
EVA-7M - 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 19: USB bus-powered circuit UBX-12003235 - R05 Production Information... -
Page 34: Circuit Using 2-Pin Antenna Supervisor
EVA-7M - 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 20: Circuit using 2-pin antenna supervisor UBX-12003235 - R05 Production Information... -
Page 35: Circuit Using 3-Pin Antenna Supervisor
EVA-7M - 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 21: Circuit using 3-pin antenna supervisor UBX-12003235 - R05 Production Information... -
Page 36: Design-In Recommendations In Combination With Cellular Operation
EVA-7M - 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 • • LEA-6 •... -
Page 37: B Component Selection
EVA-7M - Hardware Integration Manual B Component selection This section provides information about components that are critical for the performance of the EVA-7M 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 38: External Lna Protection Filter (F2)
EVA-7M - Hardware Integration Manual B.3 External LNA protection filter (F2) Depending on the application circuit, consult manufacturer datasheet for DC, ESD and RF power ratings! Manufacturer Order No. System supported Comments TDK/ EPCOS B8401: B39162-B8401-P810 GPS+GLONASS High attenuation TDK/ EPCOS... -
Page 39: Rf Esd Protection Diode (D2)
EVA-7M - Hardware Integration Manual B.7 RF ESD protection diode (D2) Manufacturer Order No. ON Semiconductor ESD9R3.3ST5G Infineon ESD5V3U1U-02LS Table 18: Recommend parts list for RF ESD protection diode B.8 Operational amplifier (U6) Manufacturer Order No. Linear Technology LT6000 Linear Technology... -
Page 40: Standard Capacitors
EVA-7M - Hardware Integration Manual B.14 Standard capacitors Name Type / Value RF-input DC block COG 47P 5% 25V Decoupling Capacitor X7R 10N 10% 16V Decoupling capacitor at VBUS Depends on USB LDO (U2) specification Decoupling capacitor at VBUS Depends on USB LDO (U2) specification Table 25: Standard capacitors B.15 Standard resistors... -
Page 41: Related Documents
Advance Information, updated section 2.4.4, updated Appendix A.1, added Appendix A.9 (Design-in Recommendations in combination with cellular operation). 28-Aug-2014 mdur Early Production Information, updated section 2.4.3, added section 2.11.1 (C88-7M - Evaluating EVA-7M on existing NEO-xM sockets). 30-Jan-2015 julu Production Information UBX-12003235 - R05... -
Page 42: Contact
EVA-7M - 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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