{"id":429476,"date":"2023-08-13T14:45:44","date_gmt":"2023-08-13T12:45:44","guid":{"rendered":"https:\/\/www.ecinews.fr\/?p=429476"},"modified":"2023-08-13T14:49:10","modified_gmt":"2023-08-13T12:49:10","slug":"note-dapplication-filtre-et-protection-contre-les-surtensions-pour-bus-i2c","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/note-dapplication-filtre-et-protection-contre-les-surtensions-pour-bus-i2c\/","title":{"rendered":"Un filtre et un circuit de protection pour augmenter l\u2019immunit\u00e9 au bruit du bus I\u00b2C"},"content":{"rendered":"<table width=\"100%\">\n<tbody>\n<tr>\n<td>\n<h3><span style=\"font-size: 16px;\">W\u00fcrth Elektronik a publi\u00e9 une nouvelle note d\u2019application :\u00a0<a href=\"https:\/\/www.we-online.com\/en\/support\/knowledge\/application-notes?d=anp121-filter-and-surge-protection\">\u00ab ANP121 \u2013 Filtre et protection contre les surtensions pour bus I\u00b2C \u00bb<\/a>.<\/span><\/h3>\n<p>Dans cette nouvelle note, le fournisseur de composants \u00e9lectroniques et \u00e9lectrom\u00e9caniques apporte une aide pr\u00e9cieuse aux d\u00e9veloppeurs qui utilisent un bus I\u00b2C (Inter-Integrated Circuit Bus) dans des sc\u00e9narios inter-carte. Une extension de l\u2019interface via des connecteurs ou des c\u00e2bles peut toutefois rendre le bus I\u00b2C sensible aux interf\u00e9rences externes telles que les d\u00e9charges \u00e9lectrostatiques (ESD), les rafales et les radiofr\u00e9quences rayonn\u00e9es. L\u2019objectif de cette note d\u2019application est de pr\u00e9senter un filtre et un circuit de protection appropri\u00e9s qui augmentent l\u2019immunit\u00e9 au bruit du bus I\u00b2C sans compromettre la qualit\u00e9 du signal des lignes de donn\u00e9es et d\u2019horloge.<br \/>\nLe dernier ajout \u00e0 la collection de notes d\u2019application sur les sites de W\u00fcrth Elektronik comprend les sections \u00ab Vue d\u2019ensemble du bus I\u00b2C \u00bb, \u00ab Vue d\u2019ensemble des sp\u00e9cifications I2C \u00bb, \u00ab S\u00e9lection des composants de filtrage et de protection contre les surtensions \u00bb, \u00ab Simulation LTspice avec une fr\u00e9quence d\u2019horloge de 400 kHz \u00bb et \u00ab Mesure d\u2019une application r\u00e9elle avec une fr\u00e9quence d\u2019horloge de 400 kHz \u00bb. La note d\u2019application a \u00e9t\u00e9 cr\u00e9\u00e9e en construisant des mod\u00e8les de simulation dans LTspice et en les mesurant dans une application r\u00e9elle pour v\u00e9rifier les r\u00e9sultats de la simulation.<\/p>\n<p><strong>Configuration de test avec FeatherWing<\/strong><\/p>\n<p>Pour v\u00e9rifier la simulation, des mesures suppl\u00e9mentaires ont \u00e9t\u00e9 effectu\u00e9es sur un\u00a0<a href=\"https:\/\/www.we-online.com\/en\/components\/products\/SENSOR_BLE__FEATHERWING_KIT?ajax=\">kit SensorBLE FeatherWing<\/a>\u00a0de W\u00fcrth Elektronik. Ce kit se compose d\u2019une carte ma\u00eetresse avec un microcontr\u00f4leur et de deux autres cartes \u00e9quip\u00e9es d\u2019un module Bluetooth WE et d\u2019un syst\u00e8me FeatherWing avec des capteurs WE (acc\u00e9l\u00e9ration \u00e0 3 axes, temp\u00e9rature, humidit\u00e9, pression). La carte ma\u00eetresse communique avec les deux autres cartes via le bus I\u00b2C \u00e0 un d\u00e9bit maximum de 400 kBit\/s. Un c\u00e2ble de donn\u00e9es de 20 cm de long a \u00e9t\u00e9 utilis\u00e9 pour connecter la carte du capteur au reste du bus I\u00b2C. Une capacit\u00e9 parasite de 400 pF par rapport \u00e0 la masse a \u00e9t\u00e9 simul\u00e9e en utilisant des MLCC. La simulation et la mesure ont montr\u00e9 que les\u00a0<a href=\"https:\/\/www.we-online.com\/en\/components\/products\/WE-CBF?s\">ferrites multicouches CMS<\/a>\u00a0en combinaison avec des\u00a0<a href=\"https:\/\/www.we-online.com\/en\/components\/products\/WE-TVS-SS\">diodes de protection ESD<\/a>\u00a0n\u2019ont pratiquement aucun effet sur le signal de donn\u00e9es (SDA) et le signal d\u2019horloge (SCL) du bus I\u00b2C, mais qu\u2019elles am\u00e9liorent plut\u00f4t l\u2019immunit\u00e9 au bruit du bus I\u00b2C.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>&nbsp;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.we-online.com\/\">www.we-online.com<\/a><\/p>\n<p><a href=\"https:\/\/news.google.com\/publications\/CAAqBwgKMJbcwQswuPfYAw?hl=fr&amp;gl=BE&amp;ceid=BE:fr\">Suivre ECInews sur Google news<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>W\u00fcrth Elektronik a publi\u00e9 une nouvelle note d\u2019application :\u00a0\u00ab ANP121 \u2013 Filtre et protection contre les surtensions pour bus I\u00b2C \u00bb. Dans cette nouvelle note, le fournisseur de composants \u00e9lectroniques et \u00e9lectrom\u00e9caniques apporte une aide pr\u00e9cieuse aux d\u00e9veloppeurs qui utilisent un bus I\u00b2C (Inter-Integrated Circuit Bus) dans des sc\u00e9narios inter-carte. Une extension de l\u2019interface via [&hellip;]<\/p>\n","protected":false},"author":36,"featured_media":429477,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[886],"tags":[4362,4288],"domains":[47],"ppma_author":[1154],"class_list":["post-429476","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-fr","tag-filtre","tag-protection","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Un filtre et un circuit de protection pour augmenter l\u2019immuni...<\/title>\n<meta name=\"description\" content=\"W\u00fcrth Elektronik a publi\u00e9 une nouvelle note d\u2019application :\u00a0\u00ab ANP121 \u2013 Filtre et protection contre les surtensions pour bus I\u00b2C \u00bb.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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