1、 TIA/EIAINTERIM STANDARDLatch Specification for the PortablePhone to Vehicle InterfaceTIA/EIA/IS-790MARCH 2000TELECOMMUNICATIONS INDUSTRY ASSOCIATIONRepresenting the telecommunications industry inassociation with the Electronic Industries Alliance TIA/EIA/IS-790NOTICETIA/EIA Engineering Standards an
2、d Publications are designed to serve the public interest througheliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability andimprovement of products, and assisting the purchaser in selecting and obtaining with minimum delay theproper product for his particul
3、ar need. Existence of such Standards and Publications shall not in anyrespect preclude any member or nonmember of TIA/EIA from manufacturing or selling products notconforming to such Standards and Publications, nor shall the existence of such Standards and Publicationspreclude their voluntary use by
4、 those other than TIA/EIA members, whether the standard is to be usedeither domestically or internationally.Standards and Publications are adopted by TIA/EIA in accordance with the American National StandardsInstitute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any
5、 patent owner,nor does it assume any obligation whatever to parties adopting the Standard or Publication.TIA/EIA INTERIM STANDARDSTIA/EIA Interim Standards contain information deemed to be of technical value to the industry, and arepublished at the request of the originating Committee without necess
6、arily following the rigorous publicreview and resolution of comments which is a procedural part of the development of a TIA/EIA Standard.TIA/EIA Interim Standards should be reviewed on an annual basis by the formulating Committee and adecision made on whether to proceed to develop a TIA/EIA Standard
7、 on this subject. TIA/EIA InterimStandards must be cancelled by the Committee and removed from the TIA/EIA Standards Catalog beforethe end of their third year of existence.Publication of this TIA/EIA Interim Standard for trial use and comment has been approved by theTelecommunications Industry Assoc
8、iation. Distribution of this TIA/EIA Interim Standard for commentshall not continue beyond 36 months from the date of publication. It is expected that following this 36month period, this TIA/EIA Interim Standard, revised as necessary, will be submitted to the AmericanNational Standards Institute for
9、 approval as an American National Standard. Suggestions for revisionshould be directed to: Standards & Technology Department, Telecommunications Industry Association,2500 Wilson Boulevard, Arlington, VA 22201.(From Project No. 4208, formulated under the cognizance of the TIA TR-45.1 Subcommittee on
10、AnalogTechnology.)Published byTELECOMMUNICATIONS INDUSTRY ASSOCIATION 2000Standards & Technology Department2500 Wilson BoulevardArlington, VA 22201PRICE: Please refer to current Catalog ofEIA ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERINGPUBLICATIONS or call Global Engineering Documents, U
11、SA and Canada(1-800-854-7179) International (303-397-7956)All rights reservedPrinted in U.S.A.PLEASE!DONT VIOLATETHELAW!This document is copyrighted by the TIA and may not be reproduced withoutpermission.Organizations may obtain permission to reproduce a limited number of copiesthrough entering into
12、 a license agreement. For information, contact:Global Engineering Documents15 Inverness Way EastEnglewood, CO 80112-5704 or callU.S.A. and Canada 1-800-854-7179, International (303) 397-7956TIA/EIA/IS-790iContents1.0 Scope.11.1 Definition of terms and acronyms 11.2 References .12.0 System strategy.1
13、3.0 System description24.0 General requirements and design integrity24.1 Material requirements 34.1.1 Resistance to fade.34.1.2 Fogging.34.1.3 Odor.34.1.4 Flammability .35.0 Latch integration .35.1 Vehicle side (direct mounting of the MML to vehicle).45.2 Vehicle side (after market applications)45.3
14、 Consumer electronics side5TIA/EIA/IS-790iiList of FiguresFigure A System pictorial description 6Figure B AMPS four hole mounting pattern .7Figure C Drawing of Multi-Media Latch 8Figure D Drawing of Multi-Media Latch 8TIA/EIA/IS-790iiiForewordThis standard has been produced jointly by members of the
15、 Telecommunications Industry Association (TIA)subcommittee TR45.1.This standard describes and defines a latching system and mechanism which provide a mechanical interface betweenthe automobile and cellular phone systems and similar consumer electronics products. This standard is subject tofuture rev
16、ision based on Automotive and Telecommunication industry requirements.TIA/EIA/IS-790ivTHIS PAGE INTENTIALLY LEFT BLANKTIA/EIA/IS-79011.0 ScopeThe scope of this standard is to define a latching system which will allow the consumer theability to mount and remove consumer electronics products into the
17、vehicle in an entirelyconvenient fashion.1.1 Definition of terms and acronymsMML Multi-Media LatchAMPS Advanced Mobile Phone SystemSAE Society of Automotive EngineersASTM American Society for Testing and MaterialsISO International Organization for Standardization1.2 ReferencesThis document makes ref
18、erence to the following documents, which are typically available fromother sources. Unless stated, reference is made to the most recent releases of these documents.In the event of conflict between the documents referenced herein and the contents of thisspecification, the contents of this specificati
19、on shall be considered the superseding requirement.Table 1. ReferencesRef. # Document Name: Document Number:/1/ Tensile Strength Method ASTM D638/2/ Coefficient of Thermal Expansion Method ASTM E831/3/ Resistance to Fade SAE J1885/4/ Fogging SAE J1756/5/ Odor SAE J1351/6/ Flammability SAE J3692.0 Sy
20、stem StrategyThe basis of the latching strategy is to define a common physical interface which can be usedby the automotive and consumer cellular industries.Once the common physical interface is defined, the vehicle manufactures and consumerelectronics manufactures can choose to incorporate this phy
21、sical interface and ensure thephysical connection of the two products.The common physical interface, defined by this specification, will be the vehicle side of the latch.This will be referred to as Multi-Media Latch, or MML, from here forward. (See FigureA)TIA/EIA/IS-7902The Multi-Media Latch is phy
22、sically defined in Figure C and D.This specification will also define requirements which will ensure the design integrity androbustness of the latching system. It will specify criteria which will ensure consistent usage,function and presentation to the consumer.3.0 System DescriptionThe latching sys
23、tem consists of four parts: (See Figure A) automotive environment (vehicle) vehicle latch (Multi-Media Latch) cellular phone latch cellular phone or consumer electronic deviceIncorporation of the latching system is accomplished on the vehicle side by the vehicle providingmeans for mounting the Multi
24、-Media Latch.The vehicle designers can define a mounting location and include all the design parameters whichthey feel are required for the consumer to easily install and operate their consumer electronicsproducts.Consumer cellular phone manufactures and consumer device manufactures can utilize thel
25、atching system and interface with the vehicle by obtaining or incorporating the means to connectto the Multi-Media Latch.4.0 General requirements and design integrityThe latch assembly will have a positive locking mechanism which will provide feedback(audible, tactile or visual) to inform the consum
26、er that the lock has been engaged.The latching set shall remain engaged when exposed to a removal force of 25 lbs. in all threeaxis.The operation of the latch and location of the release feature should be intuitive, obvious, andsimple.The latch assembly shall meet/exceed a cycle life of 5000 cycles
27、(1 cycle = engagement +disengagement) at automotive temperatures without failure. Temperature requirements are:Operational -30C to 65C. Storage -40C to 85C.TIA/EIA/IS-7903Provisions in the cellular phone half of the latch will have physical properties designed andmanufactured into the product such t
28、hat the latching system will not vibrate and cause noisewhen mounted in the automotive environment.Manufactures of any portion of the latching system wishing to be in compliance with thisstandard, must adhere to all mechanical properties and physical requirements of thisspecification.4.1 Material re
29、quirementsThe material requirements for all components of the latch system will meet the following:4.1.1 Resistance to FadeSAE J1885, ISO 105 A-02/AATCC Evaluation Procedure 1Level: Moderate exposureTest exposure: 225.6 kJ/m2Rating: AATCC rating of 44.1.2 FoggingSAE J1756 3 h at 100 C heating, 21 C
30、cooling plate, post testconditioning 1 h.Fog Number, min 70 Formation of a clear film, droplets orcrystals is a cause for rejection.4.1.3 OdorSAE J1351Rating: 24.1.4 FlammabilitySAE J369/ISO 3795Burn rate, max. 100 mm/minuteMaterial requirements for the Multi-Media Latch must meet or exceed the foll
31、owingmechanical properties:TIA/EIA/IS-7904Tensile Strength, yield, Minimum 6500 psi (Method ASTM D638)Must have a Coefficient of thermal expansion less than 4.0 E-5 inches/inch/F (MethodASTM E831)5.0 Latch integrationThe recommended mounting basis of the latching system is the AMPS four hole mountin
32、gpattern. (see Figure B)5.1 Vehicle side (direct mounting of the MML to the vehicle)The vehicle can utilize the Multi-Media Latch by providing the AMPS four hole mountingpattern and a mounting surface. The female fasteners for the connection of the MML will beprovided by the vehicle. The thread type
33、 for the fasteners are M4 x .7 mm. It is recommendedthat the vehicle design and protect for the engagement length of threaded fasteners which have adepth of: minimum 8 mm and maximum 12 mm in length.The mounting surface on the vehicle which will be in contact with the MML, shall be flat within.10 mm
34、.The area around the perimeter of the MML mounting location must be free of protrusions toallow the phone/consumer electronics portion of the latch clearance to engage the MML:There shall be no protrusions above the MML mounting plane, on the vehicle side, in the areaaround the MML mounting location
35、 . This area is described in Figure B. See Footnote1.The vehicle can choose to integrate the MML directly into a vehicle property viaincorporation of injection molding or similar manufacturing processes. If a vehicle manufacturechooses to integrate the MML, the material specifications and all other
36、requirements of thisdocument shall be met in order to ensure a robust system.5.2 Vehicle side (after market applications)Vehicle side applications of the MML may also be accomplished by “after marketapplications“ which typically are brackets, stalks, plates, etc. Applications of this type usuallyuse
37、 the AMPS four hole mounting pattern with through-holes for the mounting of products.1 Footnote 1.Flat area around the MML and protrusion keep out zone: Due to the diversity of consumer electronics products which mayutilize the MML latching system, it is recommended to expand the no protrusion area
38、around the MML to the largest areapossible. The larger the area the vehicle or mounting surface provides, results in the ability to allow mounting of a largernumber of consumer electronics products which utilize the latching system.TIA/EIA/IS-7905Recommend fasteners to utilize the MML in after marke
39、t applications are M4 x .7 countersinkhead screws with M4 x .7 nuts.Mounting properties of after market solutions must also adhere to the mechanical requirementsof this specification, which include physical properties, flatness and keep out areas.5.3 Consumer electronics sideConsumer electronics pro
40、ducts can utilize the latching system by one of two methods: 1) byfully integrating the latching mechanism directly into their products, or 2) by purchasing orproducing the latching mechanism as a separate part that can be secured to the consumerelectronics product.TIA/EIA/IS-7906TIA/EIA/IS-7907TIA/EIA/IS-7908
