{"id":3841,"date":"2025-06-23T14:34:22","date_gmt":"2025-06-23T06:34:22","guid":{"rendered":"https:\/\/www.key-iot.com\/?p=3841"},"modified":"2025-06-23T14:34:22","modified_gmt":"2025-06-23T06:34:22","slug":"design-practice-16-key-considerations-for-can-bus-application-design","status":"publish","type":"post","link":"https:\/\/www.key-iot.com\/fr\/blog\/design-practice-16-key-considerations-for-can-bus-application-design\/","title":{"rendered":"Pratique de conception 16 : consid\u00e9rations cl\u00e9s pour la conception d'applications de bus CAN"},"content":{"rendered":"
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\"7a385b2bcd0c8c0cab43075e12655d61\"<\/div>\n
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Les\u00a0R\u00e9seau de contr\u00f4leurs (CAN)<\/strong>\u00a0est une technologie de bus de terrain d\u00e9velopp\u00e9e par Bosch, essentiellement un bus de communication s\u00e9riel asynchrone. Il est largement utilis\u00e9 dans les syst\u00e8mes de contr\u00f4le \u00e9lectronique des automobiles et dans les sc\u00e9narios de contr\u00f4le industriel.<\/span><\/div>\n
\n

Vue d'ensemble du bus CAN<\/h2>\n

Le bus CAN est similaire au bus RS485 dans la mesure o\u00f9 tous deux utilisent des lignes de signal diff\u00e9rentielles pour la transmission. Les deux lignes de signal du CAN sont\u00a0CAN_H<\/strong>\u00a0et\u00a0CAN_L<\/strong>qui ont des amplitudes de signal \u00e9gales mais des phases oppos\u00e9es. La diff\u00e9rence de tension entre ces deux lignes repr\u00e9sente les niveaux logiques :<\/span><\/p>\n

    \n
  • Une diff\u00e9rence de tension positive indique une logique\u00a00<\/strong>.<\/li>\n
  • Une diff\u00e9rence de tension nulle (ou n\u00e9gative) indique une logique\u00a01<\/strong>.<\/li>\n<\/ul>\n<\/div>\n
    Le protocole CAN est plus complexe que le RS485. Alors que le RS485 utilise g\u00e9n\u00e9ralement le module UART d'un MCU, le CAN n\u00e9cessite un module d\u00e9di\u00e9.\u00a0Contr\u00f4leur CAN<\/strong>. Si le MCU n'a pas de contr\u00f4leur CAN int\u00e9gr\u00e9, un contr\u00f4leur CAN externe est n\u00e9cessaire.<\/span><\/div>\n
    \n

    Mise en \u0153uvre typique d'un bus CAN<\/h2>\n

    Un syst\u00e8me de bus CAN se compose g\u00e9n\u00e9ralement des \u00e9l\u00e9ments suivants<\/span><\/p>\n

      \n
    • MCU<\/strong>\u00a0(Unit\u00e9 de microcontr\u00f4leur)<\/li>\n
    • Contr\u00f4leur CAN<\/strong><\/li>\n
    • \u00c9metteur-r\u00e9cepteur CAN<\/strong><\/li>\n<\/ul>\n<\/div>\n
      Voici un circuit d'interface \u00e9metteur-r\u00e9cepteur typique pour un syst\u00e8me de bus CAN :<\/span><\/div>\n
      (Note : le diagramme mentionn\u00e9 dans le texte original n'est pas inclus ici).<\/em><\/span><\/div>\n
      \n

      Normes du bus CAN<\/h2>\n

      Le bus CAN a \u00e9volu\u00e9 vers deux normes internationales :\u00a0ISO11519<\/strong>\u00a0et\u00a0ISO11898<\/strong>. Leurs principales diff\u00e9rences sont les suivantes :<\/span><\/div>\n

      \n
        \n
      1. ISO11898 (R\u00e9seau en boucle ferm\u00e9e \u00e0 grande vitesse et \u00e0 courte distance)<\/strong>:\n
          \n
        • Longueur maximale du bus :\u00a040 m\u00e8tres<\/strong><\/li>\n
        • Vitesse de communication maximale :\u00a01 Mbps<\/strong><\/li>\n
        • N\u00e9cessite un\u00a0R\u00e9sistance de terminaison de 120 ohms<\/strong>\u00a0\u00e0 chaque extr\u00e9mit\u00e9 du bus.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n
          \n
            \n
          1. ISO11519-2 (R\u00e9seau en boucle ouverte \u00e0 faible vitesse et \u00e0 longue distance)<\/strong>:\n
              \n
            • Distance de transmission maximale :\u00a01 km<\/strong><\/li>\n
            • Vitesse de communication maximale :\u00a0125 kbps<\/strong><\/li>\n
            • Chaque ligne de bus n\u00e9cessite un\u00a0R\u00e9sistance en s\u00e9rie de 2,2 k\u03a9<\/strong>. Les deux lignes sont ind\u00e9pendantes et ne forment pas une boucle ferm\u00e9e.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n
              \n

              Consid\u00e9rations pratiques sur la conception<\/h2>\n

              Lors de la conception d'un syst\u00e8me de bus CAN, la m\u00e9thode de c\u00e2blage d\u00e9pend des caract\u00e9ristiques du contr\u00f4leur CAN du MCU. Par exemple, le contr\u00f4leur\u00a0STM32F103<\/strong>\u00a0poss\u00e8de les caract\u00e9ristiques suivantes de contr\u00f4leur CAN :<\/span><\/p>\n

                \n
              • Soutien\u00a0CAN2.0A<\/strong>\u00a0et\u00a0CAN2.0B<\/strong>\u00a0protocoles.<\/li>\n
              • Vitesse de communication jusqu'\u00e0\u00a01 Mbps<\/strong>.<\/li>\n
              • Class\u00e9 comme bus \u00e0 grande vitesse.<\/li>\n<\/ul>\n<\/div>\n
                Ainsi, lors de la conception du circuit \u00e9metteur-r\u00e9cepteur p\u00e9riph\u00e9rique pour le STM32F103, la configuration de la r\u00e9sistance de terminaison doit suivre le sch\u00e9ma suivant\u00a0Norme ISO11898<\/strong>\u00a0(c'est-\u00e0-dire des r\u00e9sistances de 120 ohms aux deux extr\u00e9mit\u00e9s du bus).<\/span><\/div>\n
                \n

                Conclusion<\/h2>\n

                Le bus CAN est un protocole de communication robuste et fiable largement utilis\u00e9 dans les applications automobiles et industrielles. Sa conception n\u00e9cessite une attention particuli\u00e8re \u00e0 la norme sp\u00e9cifique (ISO11898 ou ISO11519) et aux caract\u00e9ristiques des composants du MCU et de l'\u00e9metteur-r\u00e9cepteur. Dans le prochain \u00e9pisode, nous nous concentrerons sur l'analyse des d\u00e9tails du protocole CAN lui-m\u00eame.<\/span><\/div>\n

                <\/div>\n
                <\/div>","protected":false},"excerpt":{"rendered":"

                The\u00a0Controller Area Network (CAN)\u00a0is a field bus technology developed by Bosch, essentially a serial asynchronous communication bus. It is widely used in automotive electronic control systems and industrial control scenarios. Overview of CAN Bus The CAN bus is similar to the RS485 bus in that both use differential signal lines for transmission. The two signal […]<\/p>\n","protected":false},"author":1,"featured_media":3845,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"metadata":{"classic-editor-remember":["classic-editor"],"_edit_lock":["1750660404:1"],"_edit_last":["1"],"_thumbnail_id":["3845"],"themepark_seo_title":["Design Practice 16: Key Considerations for CAN Bus Application Design"],"themepark_seo_description":["The\u00a0Controller Area Network (CAN)\u00a0is a field bus technology developed by Bosch, essentially a serial asynchronous communication bus. 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