SVENSK STANDARD SS-EN :2014

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1 SVENSK STANDARD SS-EN :2014 Fastställd/Approved: Publicerad/Published: Utgåva/Edition: 1 Språk/Language: engelska/english ICS: Rymdteknik Rymdfarkoster diskreta gränssnitt Space engineering Spacecraft discrete interfaces

2 Standarder får världen att fungera SIS (Swedish Standards Institute) är en fristående ideell förening med medlemmar från både privat och offentlig sektor. Vi är en del av det europeiska och globala nätverk som utarbetar internationella standarder. Standarder är dokumenterad kunskap utvecklad av framstående aktörer inom industri, näringsliv och samhälle och befrämjar handel över gränser, bidrar till att processer och produkter blir säkrare samt effektiviserar din verksamhet. Delta och påverka Som medlem i SIS har du möjlighet att påverka framtida standarder inom ditt område på nationell, europeisk och global nivå. Du får samtidigt tillgång till tidig information om utvecklingen inom din bransch. Ta del av det färdiga arbetet Vi erbjuder våra kunder allt som rör standarder och deras tillämpning. Hos oss kan du köpa alla publikationer du behöver allt från enskilda standarder, tekniska rapporter och standardpaket till handböcker och onlinetjänster. Genom vår webbtjänst e-nav får du tillgång till ett lättnavigerat bibliotek där alla standarder som är aktuella för ditt företag finns tillgängliga. Standarder och handböcker är källor till kunskap. Vi säljer dem. Utveckla din kompetens och lyckas bättre i ditt arbete Hos SIS kan du gå öppna eller företagsinterna utbildningar kring innehåll och tillämpning av standarder. Genom vår närhet till den internationella utvecklingen och ISO får du rätt kunskap i rätt tid, direkt från källan. Med vår kunskap om standarders möjligheter hjälper vi våra kunder att skapa verklig nytta och lönsamhet i sina verksamheter. Vill du veta mer om SIS eller hur standarder kan effektivisera din verksamhet är du välkommen in på eller ta kontakt med oss på tel Standards make the world go round SIS (Swedish Standards Institute) is an independent non-profit organisation with members from both the private and public sectors. We are part of the European and global network that draws up international standards. Standards consist of documented knowledge developed by prominent actors within the industry, business world and society. They promote cross-border trade, they help to make processes and products safer and they streamline your organisation. Take part and have influence As a member of SIS you will have the possibility to participate in standardization activities on national, European and global level. The membership in SIS will give you the opportunity to influence future standards and gain access to early stage information about developments within your field. Get to know the finished work We offer our customers everything in connection with standards and their application. You can purchase all the publications you need from us - everything from individual standards, technical reports and standard packages through to manuals and online services. Our web service e-nav gives you access to an easy-to-navigate library where all standards that are relevant to your company are available. Standards and manuals are sources of knowledge. We sell them. Increase understanding and improve perception With SIS you can undergo either shared or in-house training in the content and application of standards. Thanks to our proximity to international development and ISO you receive the right knowledge at the right time, direct from the source. With our knowledge about the potential of standards, we assist our customers in creating tangible benefit and profitability in their organisations. If you want to know more about SIS, or how standards can streamline your organisation, please visit or contact us on phone +46 (0)

3 Europastandarden EN :2014 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN :2014. The European Standard EN :2014 has the status of a Swedish Standard. This document contains the official version of EN :2014. Copyright / Upphovsrätten till denna produkt tillhör SIS, Swedish Standards Institute, Stockholm, Sverige. Användningen av denna produkt regleras av slutanvändarlicensen som återfinns i denna produkt, se standardens sista sidor. Copyright SIS, Swedish Standards Institute, Stockholm, Sweden. All rights reserved. The use of this product is governed by the end-user licence for this product. You will find the licence in the end of this document. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Information about the content of the standard is available from the Swedish Standards Institute (SIS), telephone Standards may be ordered from SIS Förlag AB, who can also provide general information about Swedish and foreign standards. Har du synpunkter på innehållet i den här standarden, vill du delta i ett kommande revideringsarbete eller vara med och ta fram andra standarder inom området? Gå in på - där hittar du mer information.

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5 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN September 2014 ICS English version Space engineering - Spacecraft discrete interfaces Ingénierie spatiale - Interfaces électriques discrètes pour satellites Raumfahrttechnik - Diskrete Schnittstellen in Raumfahrzeugen This European Standard was approved by CEN on 1 March CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN/CENELEC All rights of exploitation in any form and by any means reserved worldwide for CEN national Members and for CENELEC Members. Ref. No. EN :2014 E

6 Table of contents Foreword Scope Normative references Terms, definitions and abbreviated terms Terms from other standards Terms specific to the present standard Abbreviated terms Conventions Bit numbering convention Timing diagram conventions Signal and signal event naming convention Signal timing and measurement references General Introduction Architectural concepts Overview General failure tolerance Interface control during power cycling Cross-strapping Harness cross-strapping Cable capacitance Analogue signal interfaces Overview Analogue signal monitor (ASM) interface General Analogue signal monitor interface Temperature sensors monitor (TSM) interface Overview TSM acquisition layout TSM acquisition resolution TSM wire configuration

7 5.3.5 TSM electrical characteristics Bi-level discrete input interfaces Bi-level discrete monitor (BDM) interface Overview Bi-level discrete monitor interface Bi-level switch monitor (BSM) interface General principles Bi-level switch monitor interface Pulsed command interfaces High power command (HPC) interfaces General principles High power command interface Low voltage high power command (LV-HPC) electrical characteristics High voltage high power command (HV-HPC) electrical characteristics High current high power command (HC-HPC) electrical characteristics Wiring type High power command interface arrangement Low power command (LPC) interface General Low power command interface LPC electrical characteristics Wiring type Interface arrangement Serial digital interfaces Foreword General principles of serial digital interfaces Overview General requirements bit input serial digital (ISD) interface bit input serial digital interface description Signals skew ISD interface timing specification bit input serial digital interface: signal description bit output serial digital (OSD) interface description bit output serial digital interface description

8 8.4.2 Signals skew OSD interface timing specification bit output serial digital interface signal description bit bi-directional serial digital (BSD) interface description Serial digital interface electrical circuits description Balanced differential serial digital interface signals Balanced differential serial digital interface - GATE_WRITE circuits Balanced differential serial digital interface - DATA_CLK_OUT circuits Balanced differential serial digital interface - DATA_OUT circuits Balanced differential serial digital interface - DATA_IN circuits Balanced differential serial digital interface - GATE_READ circuits Serial digital interface circuit electrical characteristics Introduction Provisions Annex A (informative) Tailoring guidelines Bibliography Figures Figure 3-1: Bit numbering convention Figure 3-2: Timing diagram conventions Figure 3-3: Signal timing and measurement references Figure 4-1: Architectural context of interfaces defined in this standard Figure 4-2: General scheme of redundant unit s cross-strapping Figure 4-3: Example scheme for Single source Dual receiver cross-strapping Figure 4-4: Example scheme for Dual source Single receiver cross-strapping Figure 4-5: Cable capacitance definitions Figure 5-1: Analogue signal monitor (single ended source) interface arrangement Figure 5-2: Analogue signal monitor (differential source) interface arrangement Figure 5-3: TSM1 reference model Figure 5-4: Requirement for R th /R th as a function of R NORM and R th. x = ±0, Figure 5-5: TSM1 interface arrangement Figure 5-6: TSM2 interface arrangement Figure 5-7: Example TSM1 and 4K3A354 thermistor Figure 5-8: Example TSM1 and YSI44907 thermistor Figure 5-9: Example TSM2 and PT1000 thermistor Figure 6-1: BDM Interface configuration

9 Figure 6-2: Switch status circuit interface arrangement Figure 7-1: HPC interface arrangement Figure 7-2: LPC active signal output voltage vs. load current Figure 7-3: LPC-P and LPC-S interface arrangement Figure 8-1: 16-bit input serial digital (ISD) interface signal arrangement Figure 8-2: 16-bit input serial digital (ISD) interface Figure 8-3: 16-bit output serial digital (OSD) interface signal arrangement Figure 8-4: 16-bit output serial digital (OSD) interface Figure 8-5: 16-bit bi-directional serial digital interface signal arrangement Figure 8-6: Balanced differential circuits for serial digital interfaces Figure 8-7: Example of serial digital interface arrangement Figure 8-8: Threshold levels for ECSS-E differential circuits Tables Table 5-1: Analogue signal monitor source circuit characteristics Table 5-2 Analogue signal receiver circuit characteristics Table 5-3: TSM1 source circuit characteristics Table 5-4: TSM1 receiver circuit characteristics Table 5-5: TSM2 source characteristics Table 5-6: TSM2 receiver characteristics Table 6-1: BDM source characteristics Table 6-2: BDM receiver characteristics Table 6-3: Switch source characteristics Table 6-4: Switch receiver characteristics Table 7-1: LV-HPC source characteristics Table 7-2: LV-HPC receiver characteristics Table 7-3: HV-HPC source characteristics Table 7-4: HV-HPC receiver characteristics Table 7-5: HC-HPC source characteristics Table 7-6: HC-HPC receiver characteristics Table 7-7: LPC source characteristics Table 7-8: LPC receiver characteristics Table 8-1: 16-bit input serial digital (ISD) interface characteristics Table 8-2: t b values Table 8-3: 16-bit output serial digital (OSD) interface characteristics Table 8-4: Serial digital interface electrical characteristics

10 Foreword This document (EN :2014) has been prepared by Technical Committee CEN/CLC/TC 5 Space, the secretariat of which is held by DIN. This standard (EN :2014) originates from ECSS-E-ST-50-14C. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2015, and conflicting national standards shall be withdrawn at the latest by March Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document has been developed to cover specifically space systems and has therefore precedence over any EN covering the same scope but with a wider domain of applicability (e.g. : aerospace). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 6

11 1 Scope This standard specifies a common set of spacecraft onboard electrical interfaces for sensor acquisition and actuator control. The interfaces specified in this standard are the traditional point-to-point interfaces that are commonly used on modern spacecraft. The interfaces specified in this standard include analogue and discrete digital interfaces used for status measurement and control, as well as point-to-point serial digital interfaces used for digital data acquisition and commanding of devices. This standard specifies: interface signal identification; interface signal waveforms; signal timing requirements; signal modulation; voltage levels; input and output impedance; overvoltage protection requirements; bit ordering in digital data words; cabling requirements where appropriate. This standard does not cover: connector requirements; digital data word semantics; message or block formats and semantics. Connector requirements are not covered because these are normally mission or project specific. The goal of this standard is to establish a single set of definitions for these interfaces and to promote generic implementations that can be re-used throughout different missions. When referred, the present standard is applicable as a complement of the already existing interface standards ANSI/TIA/EIA-422B-1994 and ITU-T Recommendation V.11 (Previously CCITT Recommendation ) (03/93). Guidance for tailoring of the present standard can be found in Annex A. This Standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00. 7