{"id":81596,"date":"2010-08-10T19:01:00","date_gmt":"2010-08-10T17:01:00","guid":{"rendered":"https:\/\/cms.galaxiemedia.fr\/tomshardware\/2010\/08\/10\/charge-et-usb-les-explications\/"},"modified":"2023-06-22T19:19:09","modified_gmt":"2023-06-22T17:19:09","slug":"charge-et-usb-les-explications","status":"publish","type":"post","link":"https:\/\/www.tomshardware.fr\/charge-et-usb-les-explications\/","title":{"rendered":"Charge et USB : les explications"},"content":{"rendered":"<p><span class=\"imgContent imgRight\"><span class=\"iZoom\"><a href=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2010\/08\/chargeur-secteur-usb-apple-pour-iphone-et-ipod.jpg\" class=\"wrapper-lightbox\"><img alt=\"Image 1 : Charge et USB : les explications\" decoding=\"async\" width=\"200\" height=\"200\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2010\/08\/chargeur-secteur-usb-apple-pour-iphone-et-ipod-200x200.jpg\" class=\"attachment-purch-200 size-purch-200\" alt=\"\" \/><\/a><\/span><\/span><\/p>\n<\/p>\n<p>Nous avons d\u00e9j\u00e0 parl\u00e9 de la charge en USB, une chose de plus en plus courante. Expliquons les diff\u00e9rents modes qui existent pour charger un appareil mobile avec un port USB.\u00a0<\/p>\n<\/p>\n<p>Premi\u00e8rement, il y a le chargeur de base, qui ne fournit que le courant \u00e9lectrique. La norme est simple : c&#8217;est 100 mA au maximum quand il n&#8217;y a pas de signal de donn\u00e9es. Les chargeurs bas de gamme n&#8217;ont g\u00e9n\u00e9ralement pas le signal en question et certains t\u00e9l\u00e9phones bloquent donc la charge quand sur ce type de chargeur : ils consid\u00e8rent qu&#8217;ils ne vont recevoir que 100 mA, ce qui est trop peu pour une charge, m\u00eame si le chargeur fournit plus.<\/p>\n<\/p>\n<p>Ensuite, il y a le chargeur \u00ab intelligent \u00bb, qui fournit 500 mA et pr\u00e9vient le p\u00e9riph\u00e9rique que c&#8217;est le cas, via les lignes de donn\u00e9es. C&#8217;est le cas de la majorit\u00e9 des chargeurs de marque. <\/p>\n<\/p>\n<p>On trouve aussi les appareils \u00e0 la norme \u00ab USB Battery Charging Specification 1.1 \u00bb. Il existe plusieurs modes, mais on reste (globalement) dans deux cas : soit l&#8217;appareil envoie des donn\u00e9es, et l&#8217;intensit\u00e9 ne peut pas d\u00e9passer 500 mA, soit il s&#8217;agit d&#8217;un port d\u00e9di\u00e9 \u00e0 la charge (int\u00e9gr\u00e9 dans un ordinateur ou dans un bo\u00eetier externe) et l&#8217;intensit\u00e9 peut atteindre 1 500 mA (en 5 V, soit 7,5 W). Dans les deux cas, l&#8217;appareil doit envoyer des informations au p\u00e9riph\u00e9rique pour que celui-ci connaisse (et accepte) l&#8217;intensit\u00e9 du courant.<\/p>\n<\/p>\n<p>Comme on le voit, l&#8217;USB a \u00e9t\u00e9 pens\u00e9 (dans ses derni\u00e8res r\u00e9visions) pour un usage \u00ab chargement \u00bb et la proposition de la Comission europ\u00e9enne d&#8217;utiliser le Micro USB est donc int\u00e9ressante. <\/p>\n<\/p>\n<p>Notons toutefois que certaines marques (notamment Apple) vont parfois plus loin que la norme, avec par exemple des ports USB qui envoient 1 A tout en laissant passer des donn\u00e9es (sur les Mac sortis apr\u00e8s 2007).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La charge en USB : les explications.<\/p>","protected":false},"author":36,"featured_media":81597,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[487,4076,4068,4102,4104],"tags":[],"hubs":[],"acf":{"post_show_excerpt":false,"post_source":{"title":"Tom's Hardware FR","url":"http:\/\/www.presence-pc.com\/","target":""}},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Charge et USB : les explications<\/title>\n<meta name=\"description\" content=\"La charge en USB : les explications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tomshardware.fr\/charge-et-usb-les-explications\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta 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