EVM-915-025 Data Guide
Contents
1. TECHNOLOGIES EVM 915 025 D t Guide Wireless made simple A Warning Linx radio frequency RF products may be used to control machinery or devices remotely including machinery or devices that can cause death bodily injuries and or property damage if improperly or inadvertently triggered particularly in industrial settings or other applications implicating life safety concerns No Linx Technologies product is intended for use in any application without redundancies where the safety of life or property is at risk The customers and users of devices and machinery controlled with RF products must understand and must use all appropriate safety procedures in connection with the devices including without limitation using appropriate safety procedures to prevent inadvertent triggering by the user of the device and using appropriate security codes to prevent triggering of the remote controlled machine or device by users of other remote controllers Do not use this or any Linx product to trigger an action directly from the data line or RSSI lines without a protocol or encoder decoder to validate the data Without validation any signal from another unrelated transmitter in the environment received by the module could inadvertently trigger the action All RF products are susceptible to RF interference that can prevent communication RF products without frequency agility or hopping implemented are more subject to interference T2. rules Operation of this device is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorientor relocate the receiving antenna e Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Any modifications could void the user s authority to operate the equipment Product Labeling The end product must be labeled to meet
3. High Von 25 Ves VDC 8 Input 7 6 Logic Low Vi 0 0 3 V VDC 5 z 4 Logic High ja nN Ves VDC 3 Environmental Operating Temperature Range 40 85 C Figure 3 Electrical Specifications A Warning This product incorporates numerous static sensitive components Always wear an ESD wrist strap and observe proper ESD handling procedures when working with this device Failure to observe this precaution may result in module damage or failure V vV GNDGND Figure 4 25 Series EVM Module Schematic Pin Assignments Pin Descriptions o O 1 0 O 24 Pin Number Name I O Description 2 0 60 23 1 VCC Supply Voltage 3 1015 B 22 UART Receive Data Input This is the input 40 ol21 2 RXD line for the configuration commands as well as data to be sent over the air 516 20 UART Transmit Data Output This is the 6 0 19 3 TXD o Output line for the configuration command 710 18 responses as well as the data received over the air 8 6 iq 01 17 UART Clear To Send active low This line 9 0 O 116 indicates to the host microcontroller when 10 6115 4 CTS O the module is ready to accept data When CTS is high the module is busy When CTS 100 14 is low the module is ready for data 1210 113 Command Input This line sets the serial data as either command data to configure Figure 5 25 Series EVM Module Pin Assignments To
4. NT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY OF CUSTOMER S INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY FROM ANY DEFECTIVE OR NON CONFORMING PRODUCTS OR FOR ANY OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES The limitations on Linx Technologies liability are applicable to any and all claims or theories of recovery asserted by Customer including without limitation breach of contract breach of warranty strict liability or negligence Customer assumes all liability including without limitation liability for injury to person or property economic loss or business interruption for all claims including claims from third parties arising from the use of the Products The Customer will indemnify defend protect and hold harmless Linx Technologies and its officers employees subsidiaries affiliates distributors and representatives from and against all claims damages actions suits proceedings demands assessments adjustments costs and expenses incurred by Linx Technologies as a result of or arising from any Products sold by Linx Technologies to Customer Under no conditions will Linx Technologies be responsible for losses arising from the use or failure of the device in any application other than the repair replacement or refund limited to the original product purchase price Devices described in this publication may contain proprietary patented or copyrighted techniques components or materials Under no circumstances shall a
5. ddress in depth key areas of RF design and application of Linx products These application notes are available online at www linxtechnologies com or by contacting Linx Helpful Application Note Titles Note Number Note Title AN 00100 RF 101 Information for the RF Challenged AN 00126 Considerations for Operation Within the 902 928MHz Band AN 00130 Modulation Techniques for Low Cost RF Data Links AN 00140 The FCC Road Part 15 from Concept to Approval AN 00160 Considerations for Sending Data Over a Wireless Link AN 00500 Antennas Design Application Performance AN 00501 Understanding Antenna Specifications and Operation Figure 8 Helpful Application Notes Power Supply Requirements The transceiver incorporates a precision TO low dropout regulator which allows operation MODULE over a wide input voltage range Despite this fou regulator it is still important to provide a supply Vec IN that is free of noise Power supply noise can significantly affect the module s performance so cia providing a clean power supply for the module should be a high priority during design 10uF Figure 9 Supply Filter A 10Q resistor in series with the supply followed by a 1 tantalum capacitor from V to ground helps in cases where the quality of supply power is poor Figure 9 This filter should be placed close to the module s supply lines These values may need to be adjusted depending on the noise present on the supply lin
6. e Interference Considerations The RF spectrum is crowded and the potential for conflict with unwanted sources of FF is very real While all RF products are at risk from interference its effects can be minimized by better understanding its characteristics Interference may come from internal or external sources The first step is to eliminate interference from noise sources on the board This means paying careful attention to layout grounding filtering and bypassing in order to eliminate all radiated and conducted interference paths For many products this is straightforward however products containing components such as switching power supplies motors crystals and other potential sources of noise must be approached with care Comparing your own design with a Linx evaluation board can help to determine if and at what level design specific interference is present External interference can manifest itself in a variety of ways Low level interference produces noise and hashing on the output and reduces the link s overall range High level interference is caused by nearby products sharing the same frequency or from near band high power devices It can even come from your own products if more than one transmitter is active in the same area It is important to remember that only one transmitter at a time can occupy a frequency regardless of the coding of the transmitted signal This type of interference is less common than those mention
7. ed for use with this device Linx Part Number Type Gain Impedance ANT 916 CW QW YA Wave Whip 1 84dBi 500 ANT 916 CVV HVV Y Wave Dipole Helical 1 83dBi 500 Figure 10 Antenna Selection An approved antenna must be directly attached to the module s reverse polarity SMA connector in the final application to inherit the FCC and Anatel modular certification 11 Linx TECHNOLOGIES Linx Technologies 159 Ort Lane Merlin OR US 97532 Phone 1 541 471 6256 Fax 1 541 471 6251 www linxtechnologies com Disclaimer Linx Technologies is continually striving to improve the quality and function of its products For this reason we reserve the right to make changes to our products without notice The information contained in this Data Guide is believed to be accurate as of the time of publication Specifications are based on representative lot samples Values may vary from lot to lot and are not guaranteed Typical parameters can and do vary over lots and application Linx Technologies makes no guarantee warranty or representation regarding the suitability of any product for use in any specific application t is the customer s responsibility to verify the suitability of the part for the intended application NO LINX PRODUCT IS INTENDED FOR USE IN ANY APPLICATION WHERE THE SAFETY OF LIFE OR PROPERTY IS AT RISK Linx Technologies DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IN NO EVE
8. ed previously but in severe cases it can prevent all useful function of the affected device Although technically not interference multipath is also a factor to be understood Multipath is a term used to refer to the signal cancellation effects that occur when RF waves arrive at the receiver in different phase relationships This effect is a particularly significant factor in interior environments where objects provide many different signal reflection paths Multipath cancellation results in lowered signal levels at the receiver and shorter useful distances for the link Usage Guidelines for FCC Compliance The EVM 915 025 module is provided with an FCC Modular Certification This certification shows that the module meets the requirements of FCC Part 15 standards for an intentional radiator The integrator does not need to conduct any further testing under these rules provided that the following guidelines are met An approved antenna must be directly coupled to the module s RP SMA connector e Alternate antennas can be used but may require the integrator to perform certification testing e The module must not be modified in any way Coupling of external circuitry must not bypass the provided connectors End product must be externally labeled with Contains FCC ID Q7V 3FO90008X The end products users manual must contain an FCC statement equivalent to that listed on page 10 of this data guide e The antenna used for t
9. his module does have a frequency hopping protocol built in but the developer should still be aware of the risk of interference Do not use any Linx product over the limits in this data guide Excessive voltage or extended operation at the maximum voltage could cause product failure Exceeding the reflow temperature profile could cause product failure which is not immediately evident Do not make any physical or electrical modifications to any Linx product This will void the warranty and regulatory and UL certifications and may cause product failure which is not immediately evident Table of Contents AN ND 206 2015800100 DY O O Description Ordering Information Electrical Specifications Schematic Diagram Pin Assignments Pin Descriptions PCB Footprint PCB Footprint Board Layout Guidelines Helpful Application Notes from Linx Power Supply Requirements Interference Considerations Usage Guidelines for FCC Compliance Additional Testing Requirements Module Modification Information to the User Product Labeling Antenna Selection 25 Series Transceiver oo Evaluation Module INX Dala Guide TECHNOLOGIES 4 4 r Ar Fe 9 Ce Do 0 Log 2 CR Phy Figure 1 25 Series Evaluation Module Description The EVM 915 025 features the 25 Series transceiver module in a FCC modular approved solution It is designed to greatly simplify implementation of the 25 Serie
10. his transceiver must not be co located or operating in conjunction with any other antenna or transmitter The integrator must not provide any information to the end user on how to install or remove the module from the end product Note The integrator is required to perform unintentional radiator testing on the final product per FCC sections 15 107 and 15 109 Any changes or modifications not expressly approved by Linx Technologies could void the user s authority to operate the equipment Additional Testing Requirements The modules have been tested for compliance as an intentional radiator but the integrator is required to perform unintentional radiator testing on the final product per FCC sections 15 107 and 15 109 Additional product specific testing might be required Please contact the FCC regarding regulatory requirements for the application Ultimately is it the integrator s responsibility to show that their product complies with the regulations applicable to their product Module Modification The module must not be physically altered in any way If any connections are made to the modules that bypass the module pins socket or antenna connector neither the FCC nor Anatel modular certification can be inherited Information to the User The following information must be included in the product s user manual FCC IC NOTICES This product contains FCC ID Q7V 3FO90008X This device complies with Part 15 of the FCC
11. l to exercise care in PCB layout Failure to observe good layout techniques can result in a significant degradation of the module s performance Grounding filtering decoupling routing and PCB stack up are all important considerations for any RF design Some basic design guidelines are provided here The module should as much as reasonably possible be isolated from other components on your PCB especially high frequency circuitry such as crystal oscillators switching power supplies and high speed bus lines When possible separate RF and digital circuits into different PCB regions Make sure internal wiring is routed away from the module and antenna and is secured to prevent displacement Bypass caps should be low ESR ceramic types and located directly adjacent to the pin they are serving In some instances a designer may wish to encapsulate or pot the product Since such compounds can considerably impact RF performance and the ability to rework or service the product it is the responsibility of the designer to evaluate and qualify the impact and suitability of such materials 6 Helpful Application Notes from Linx t is not the intention of this manual to address in depth many of the issues that should be considered to ensure that the modules function correctiy and deliver the maximum possible performance As you proceed vvith your design you may vvish to obtain one or more of the follovving application notes vvhich a
12. ny user be conveyed any license or right to the use or ownership of such items 2015 Linx Technologies All rights reserved The stylized Linx logo Wireless Made Simple WiSE CipherLinx and the stylized CL logo are trademarks of Linx Technologies
13. p View 5 CMD l ie data 2 hs sent e air Pull low for command data pull hig for packet data 8 7 Eh Eh 1 NC Electrical Connection Do not connect 15 ila 117 HS any traces to these lines 11 12 13 14 23 24 GND Ground Exception Output A mask can be set 19 EX o to take this line high when an exception occurs The line is lovvered vvhen the exception register is read regEXCEPTION This line outputs an analog voltage that is 20 RSSI O proportional to the strength of the incoming signal Command Response This line is low when ARVIN TED the data on the TXD line is a response to a z CMD_RSP command and not data received over the alr Buffer Empty This line goes high when the 22 BE O UART input buffer is empty indicating that all data has been transmitted Figure 6 25 Series EVM Module Pin Descriptions Note Please see the TRM 915 R25 data guide for complete information about the module detailed specifications and configuration commands PCB Footprint 1 50 38 10 A 0 208 5 28 d 0 10 N x o 1 38 2 54 35 05 OOOOOO 00 04 x 24 1 02 FA 0 7 1 78 1 40 35 56 1 loooooooooooo x A l l G zo ne 2 1 27 Figure 7 25 Series EVM Module PCB Footprint Board Layout Guidelines The module s design makes integration straightforward however it is still critica
14. s module into a working design without the complications of FCC testing The 25 Series RF transceiver module is designed for reliable bi directional transfer of digital data over distances of up to 1 mile 1 6km line of sight It implements a Frequency Hopping Spread Spectrum FHSS protocol along with networking and assured delivery features The module automatically handles all radio functions resulting in a UART to antenna wireless link The module has a Universal Asynchronous Receiver Transmitter UART serial interface that can be directly connected to microcontrollers RS 232 converters or USB adaptors All configuration settings and data are accessed through the UART interface s n Revised 3 18 2015 Ordering Information Schematic Diagram Ordering Information Link Part No Description Radiotronix Part No TRM 915 R25 Evaluation Module EVM 915 025 FCR 915 2 Right Angle RP SMA Wi 232FHSS 25 FCC RA R Connector FCC Approved TRM 915 R25 Evaluation Module EVM 915 025 FCS 915MHz Straight RP SMA Wi 232FHSS 25 FCC ST R Connector FCC Approved GND i Figure 2 Ordering information GND GND i GND i Electrical Specifications VCC Electrical Specifications Parameter Designation Min Typ Max Units Notes Power Supply Operating Voltage V 4 12 VDC Supply Current b Receive 25 mA Transmit Po 2dBm 35 mA Transmit Po 13dBm 70 mA Digital Interface Output Logic Low Vow 0 0 4 VDC ia Hi 9 Logic
15. the FCC product label requirements It must have the below or similar text Contains FCC ID Q7V 3FO90008X The Brazil version must contain The label must be permanently affixed to the product and readily visible to the user Permanently affixed means that the label is etched engraved stamped silkscreened indelibly printed or otherwise permanently marked on a permanently attached part of the equipment or on a nameplate of metal plastic or other material fastened to the equipment by welding riveting or a permanent adhesive The label must be designed to last the expected lifetime of the equipment in the environment in which the equipment may be operated and must not be readily detachable Antenna Selection Under FCC regulations this radio transmitter may only operate using an antenna of a type and maximum or lesser gain approved for the transmitter by the FCC To reduce potential radio interference to other users the antenna type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication The EVM 915 025 FCx radio transmitter has been approved by the FCC to operate with the antenna types listed in Figure 10 with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibit
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