u-blox EVA-8M Series Hardware Integration Manual

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u-blox EVA-8M Series Hardware Integration Manual Manual pdf 22 page image

EVA-8M and EVA-M8 series - Hardware Integration ManualUBX-16010593 - R06 Design-in Page 22 of 47Early Production Information☞ The paste mask outline needs to be considered when defining the minimal distance to the nextcomponent.☞ These are recommendations only and not specifications. The exact geometry, distances, stencilthicknesses and solder paste volumes must be adapted to the specific production processes (e.g.soldering etc.) of the customer.2.11.3 PlacementA very important factor in achieving maximum GNSS performance is the placement of the receiver onthe PCB. The connection to the antenna must be as short as possible to avoid jamming into the verysensitive RF section.Make sure that RF critical circuits are clearly separated from any other digital circuits on the systemboard. To achieve this, position the receiver digital part towards your digital section of the systemPCB. Care must also be exercised with placing the receiver in proximity to circuitry that can emit heat.The RF part of the receiver is very sensitive to temperature and sudden changes can have an adverseimpact on performance.⚠ High temperature drift and air vents can affect the GNSS performance. For best performanceavoid high temperature drift and air vents near the module.2.12 Migration considerationsu-blox is committed to ensuring that products in the same form factor are backwards compatible overseveral technology generations. Utmost care has been taken to ensure there is no negative impact onfunction or performance and to make u-blox 8 / u-blox M8 modules as fully compatible as possiblewith u-blox 7 versions. If using BeiDou, check the bandwidth of the external RF components and theantenna. For power consumption information, see theEVA-M8 Data Sheet [1] and theEVA-8M DataSheet [2].The EVA-M8M and EVA-M8Q GNSS modules provide flash firmware update capabilities whenconnecting an external SQI flash memory device. More information and recommendations for usingan external SQI flash see section 2.2.5. It is highly advisable that customers consider a design reviewwith the u-blox support team to ensure the compatibility of key functionalities.☞ For EVA-7M design which makes use of the single crystal feature, cannot be migrated to EVA-M8Q! Because single crystal feature is not supported on EVA-M8Q.☞ For an overall description of the module software operation, see theu-blox 8 / u-blox M8 ReceiverDescription Including Protocol Specification [3].☞ For migration, see theu-blox 7 to u-blox 8 / u-blox M8 Software Migration Guide [7].2.12.1 Hardware migration from EVA-7M to EVA-8M / EVA-M8M / EVA-M8QPinEVA-7M EVA-8M / EVA-M8M / EVA-M8QPin Name Typical Assignment Pin Name Typical Assignment Remarks forMigration1 RF input Add external LNA andSAW if no activeantenna usedRF input Add external LNA and SAW if no activeantenna usedEVA-8M / EVA-M8Mrequire external LNA ifpassive antenna isused. External LNA isrecommended forEVA-M8Q.2 GND Ground GND Ground No difference3 Reserved Leave open. Reserved Leave open. No difference4 Reserved Leave open. Reserved Leave open. No difference