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EVA-8M and EVA-M8 series
u-blox 8 / u-blox M8 GNSS SiP modules
Hardware Integration Manual
Abstract
This document describes the hardware features and specifications 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-8M and EVA-M8 series
modules combine excellent GNSS performance with highly flexible power, design, and serial
communication options.
www.u-blox.com
UBX-16010593 - R06
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Table of Contents
Related Manuals for u-blox EVA-8M Series
Summary of Contents for u-blox EVA-8M Series
- Page 1 Hardware Integration Manual Abstract This document describes the hardware features and specifications 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-8M and EVA-M8 series modules combine excellent GNSS performance with highly flexible power, design, and serial communication options.
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Page 2: Document Information
The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular purpose of the information. -
Page 3: Table Of Contents
EVA-8M and EVA-M8 series - Hardware Integration Manual Contents Document Information ..........................2 Contents ................................3 Hardware description ........................... 6 1.1 Overview ................................ 6 Design-in ..............................7 2.1 Power management ........................... 7 2.1.1 Overview ............................... 7 2.1.2 Power management configuration ....................8 2.2 Interfaces .............................. - Page 4 EVA-8M and EVA-M8 series - Hardware Integration Manual 2.12 Migration considerations ........................22 2.12.1 Hardware migration from EVA-7M to EVA-8M / EVA-M8M / EVA-M8Q ......22 2.12.2 C88-M8M - Evaluating EVA-M8M on existing NEO-xM sockets ..........24 2.13 EOS/ESD/EMI precautions ........................25 2.13.1 Electrostatic Discharge (ESD) .......................
- Page 5 EVA-8M and EVA-M8 series - Hardware Integration Manual B.6 External LNA (U1) ............................. 42 B.7 Optional SQI Flash (U3) ..........................43 B.8 RF ESD protection diode (D2) ......................... 43 B.9 Operational amplifier (U6) ........................43 B.10 Open-drain buffer (U4, U7 and U8) ......................43 B.11 Antenna supervisor switch transistor (T1) ..................
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Page 6: Hardware Description
Hardware description 1.1 Overview The EVA-8M / EVA-M8 series GNSS modules feature the excellent performance of the u-blox 8 / u- blox M8 positioning engine. The EVA-8M / EVA-M8 series delivers high sensitivity and minimal acquisition times in the ultra-compact EVA form factor. -
Page 7: Design-In
EVA-8M and EVA-M8 series - Hardware Integration Manual Design-in In order to obtain good performance with EVA-8M / EVA-M8 series GNSS receiver modules, there are a number of issues requiring careful attention during the design-in. These include: • Power Supply: Good performance requires a clean and stable power supply. -
Page 8: Power Management Configuration
EVA-8M and EVA-M8 series - Hardware Integration Manual 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 9: Interfaces
☞ The TXD Ready functionality can be enabled and configured by proper AT commands sent to the involved u-blox cellular module supporting the feature. For more information see the Implementation and Aiding Features in u-blox wireless modules [6]. -
Page 10: Display Data Channel (Ddc) Interface
To make use of DDC interface the D_SEL pin has to be left open. ☞ The EVA-8M / EVA-M8 series GNSS modules DDC interface provides serial communication with u-blox cellular modules. See the specification of the applicable cellular module to confirm compatibility. 2.2.3 SPI Interface The SPI interface can be used to provide a serial communication with a host CPU. -
Page 11: Sqi Flash Memory
EVA-8M and EVA-M8 series - Hardware Integration Manual Name Component Function Comments Regulates VBUS (4.4 …5.25 Almost no current requirement (~1 mA) if the GNSS receiver is V) down to a voltage of 3.3 V). operated as a USB self-powered device, but if bus-powered LDO (U1) must be able to deliver the maximum current of ~100 mA. -
Page 12: I/O Pins
(VCC_IO is used to supply the SQI Flash). This will ensure that any connected SQI Flash memory will be detected correctly at startup. u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification See the [3] for setting the iomonCfg value. -
Page 13: External Interrupt
[2] 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 And I/O Lines
U7 or if it’s not required (e.g. in Power Save Mode). The status of the active antenna can be checked by the UBX-MON-HW message. More information u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification see the [3]. -
Page 15: Real-Time Clock (Rtc)
EVA-8M and EVA-M8 series - Hardware Integration Manual 2.4 Real-Time Clock (RTC) The use of the RTC is optional to maintain time in the event of power failure at VCC_IO. The RTC is required for hot start, warm start, AssistNow Autonomous, AssistNow Offline and in some Power Save Mode operations. -
Page 16: Time Aiding
Including Protocol Specification [3]. ☞ For information of this use case, it is mandatory to contact u-blox support team. ☞ For Power Save Mode operations where the RTC is needed, the time aiding cannot be used. This is because the host does not have any information about when the EVA-8M / EVA-M8 series GNSS modules turn from OFF status to ON status during ON/OFF operation of Power Save Mode. -
Page 17: Improved Jamming Immunity
55 55 at 9600 baud) can be sent by the host to the EVA-8M / EVA-M8 series GNSS modules in order to enable communication. After sending the training sequence, the host has to wait for at least 2 ms u-blox 8 / u-blox M8 Receiver before sending messages to the receiver. For further information see the Description Including Protocol Specification [3]. -
Page 18: System Reset (Reset_N)
EVA-8M and EVA-M8 series - Hardware Integration Manual Safe Boot Mode is used in production to program the SQI Flash. It is recommended to have the possibility to pull the SAFEBOOT_N pin “low” when the module starts up. This can be provided using an externally connected test point or via a host CPUs digital I/O port. -
Page 19: Pin Description
EVA-8M and EVA-M8 series - Hardware Integration Manual • VDD_USB: Connect the USB power supply to a LDO before feeding it to VDD_USB and VCC or connect it to GND if USB is not used. • Ensure an optimal ground connection to all ground pins of the EVA-8M / EVA-M8 series GNSS modules. -
Page 20: Pin Name Changes
Selected EVA-M8M pin names have been updated to agree with a common naming convention across u-blox modules. The pins have not changed their operation and are the same physical hardware but with updated names. The table below lists those pins along with their old and new names. -
Page 21: Layout
EVA-8M and EVA-M8 series - Hardware Integration Manual Calculation of the micro strip for RF input The micro strip / coplanar waveguide must be 50 Ω and be routed in a section of the PCB where minimal interference from noise sources can be expected. Make sure around the RF line is only GND as well as under the RF line. -
Page 22: Placement
Utmost care has 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 bandwidth of the external RF components and the... - Page 23 EVA-8M and EVA-M8 series - Hardware Integration Manual EVA-7M EVA-8M / EVA-M8M / EVA-M8Q Pin Name Typical Assignment Pin Name Typical Assignment Remarks for Migration USB_DM USB data USB_DM USB Data No difference USB_DP USB data USB_DP USB Data No difference V_USB USB supply VDD_USB...
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Page 24: C88-M8M - Evaluating Eva-M8M On Existing Neo-Xm Sockets
Table 7: Pin-out comparison EVA-7M vs. EVA-8M / EVA-M8M / EVA-M8Q 2.12.2 C88-M8M - Evaluating EVA-M8M on existing NEO-xM sockets The C88-M8M GNSS application board is designed for easier evaluation and design-in of u-blox EVA- M8M modules in existing NEO-xM modules based products. The C88-M8M series integrates the EVA- M8M GNSS modules into a NEO form factor adaptor board (i.e. -
Page 25: Eos/Esd/Emi Precautions
EVA-8M and EVA-M8 series - Hardware Integration Manual NEO-6M C88-M8M Pin Name Typical Assignment Pin Name Typical Assignment Remarks for Migration recommended in order to achieve the EVA- performance values shown in the M8 Data Sheet [1]. The Noise Figure of the C88-M8M is about 2 dB higher than NEO-6M. -
Page 26: Electrostatic Discharge (Esd)
EVA-8M and EVA-M8 series - Hardware Integration Manual 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. The term is usually used in the electronics and other industries to describe momentary unwanted currents that may cause damage to electronic equipment. -
Page 27: Electromagnetic Interference (Emi)
GNSS receiver. Make sure that absolute maximum input power level of the GNSS receiver is not exceeded. ☞ See the GPS Implementation and Aiding Features in u-blox wireless modules [6]. 2.13.6.1 Isolation between GNSS and GSM antenna In a handheld type design, an isolation of approximately 20 dB can be reached with careful placement of the antennas. - Page 28 EVA-8M and EVA-M8 series - Hardware Integration Manual 2.13.6.3 In-band interference With in-band interference, the signal frequency is very close to the GPS frequency of 1575 MHz (see Figure 8). Such interference signals are typically caused by harmonics from displays, micro-controller, bus systems, etc.
- Page 29 EVA-8M and EVA-M8 series - Hardware Integration Manual Figure 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 section 2.13.6) into the antenna input line to the GNSS receiver (see Figure 11).
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Page 30: Product Handling & Soldering
EVA-8M and EVA-M8 series - Hardware Integration Manual Product handling & soldering 3.1 Packaging, shipping, storage and moisture preconditioning For information pertaining to reels and tapes, Moisture Sensitivity levels (MSD), shipment and EVA-M8 Data Sheet storage information, as well as drying for preconditioning see the [1] and the EVA-8M Data Sheet [2]. -
Page 31: Reflow Soldering
Some components on the EVA-8M / EVA-M8 series GNSS 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-8M / EVA-M8 series GNSS modules caused by any Ultrasonic Processes. UBX-16010593 - R06 Product handling &... -
Page 32: Product Testing
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 33: Appendix
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 33 of 47... -
Page 34: Best Performance Circuit With Passive Antenna
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 34 of 47 Early Production Information... -
Page 35: Improved Jamming Immunity With Passive Antenna
EVA-8M and EVA-M8 series - 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 UBX-16010593 - R06 Appendix Page 35 of 47... -
Page 36: Circuit Using Active Antenna
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 36 of 47 Early Production Information... -
Page 37: Usb Self-Powered Circuit With Passive Antenna
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 37 of 47... -
Page 38: Usb Bus-Powered Circuit With Passive Antenna
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 38 of 47 Early Production Information... -
Page 39: Circuit Using 2-Pin Antenna Supervisor
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 39 of 47 Early Production Information... -
Page 40: Circuit Using 3-Pin Antenna Supervisor
EVA-8M and EVA-M8 series - 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-16010593 - R06 Appendix Page 40 of 47 Early Production Information... -
Page 41: B Component Selection
EVA-8M and EVA-M8 series - Hardware Integration Manual B Component selection This section provides information about components that are critical for the performance of the EVA-8M / EVA-M8 series GNSS modules. Recommended parts are selected on a data sheet basis only. Temperature range specifications need only be as wide as required by a particular application. -
Page 42: External Lna Protection Filter (F2)
EVA-8M and EVA-M8 series - 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 TDK/ EPCOS... -
Page 43: Optional Sqi Flash (U3)
EVA-8M and EVA-M8 series - Hardware Integration Manual B.7 Optional SQI Flash (U3) Manufacturer Order No. Module Comments Adesto AT25SL641 EVA-M8M 1.8V, 64 Mbit (only 32 Mbit usable), several package/temperature options EVA-8M 1.8V, 64 Mbit (only 32 Mbit usable), several package/temperature options Gigadevice GD25Q32C... -
Page 44: Antenna Supervisor Switch Transistor (T1)
EVA-8M and EVA-M8 series - Hardware Integration Manual B.11 Antenna supervisor switch transistor (T1) Manufacturer Order No. Vishay Si1016X-T1-E3 (p-channel) Table 22: Recommend parts list for antenna supervisor switch transistor (p-channel MOSFET) B.12 Ferrite beads (FB1) Manufacturer Order No. Comments MuRata BLM15HD102SN1 High impedance @ 1.575 GHz... -
Page 45: Standard Resistors
EVA-8M and EVA-M8 series - Hardware Integration Manual B.16 Standard resistors Name Type / Value USB data serial termination 27R 5% 0.1W USB data serial termination 27R 5% 0.1W Pull-up at antenna supervisor transistor 100K 5% 0.1W Antenna supervisor current limiter 10R 5% 0.25W Antenna supervisor voltage divider 560R 5% 0.1W... -
Page 46: Related Documents
Related documents EVA-M8 Data Sheet, Doc. No. UBX-16014189 EVA-8M Data Sheet, Doc. No. UBX-16009928 u-blox 8 / u-blox M8 Receiver Description Including Protocol Specification (Public version), Doc. UBX-13003221 GPS Antenna Application Note Doc. No. GPS-X-08014 GPS Compendium, Doc. No. GPS-X-02007 GPS Implementation and Aiding Features in u-blox wireless modules, Doc. -
Page 47: Contact
EVA-8M and EVA-M8 series - 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...