{"id":21153,"date":"2023-02-01T09:48:41","date_gmt":"2023-02-01T08:48:41","guid":{"rendered":"https:\/\/botland.com.pl\/blog\/?p=21153"},"modified":"2023-05-24T10:00:22","modified_gmt":"2023-05-24T08:00:22","slug":"interfejs-do-kwadratu-magistrala-i2c-co-to-jest","status":"publish","type":"post","link":"https:\/\/botland.com.pl\/blog\/interfejs-do-kwadratu-magistrala-i2c-co-to-jest\/","title":{"rendered":"Interfejs do kwadratu. Magistrala I2C &#8211; co to jest?"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Czas czytania:<\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span>\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"21153\" class=\"elementor elementor-21153\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-845e302 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"845e302\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-29e29e3\" data-id=\"29e29e3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-42cb57d elementor-widget elementor-widget-text-editor\" data-id=\"42cb57d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>I\u00b2C, czyli Inter-Integrated Circuit, jest\u00a0<span style=\"font-size: 1rem;\">synchroniczn\u0105,\u00a0<\/span><span style=\"font-size: 1rem;\">szeregow\u0105 magistral\u0105 komunikacyjn\u0105.<\/span><span style=\"font-size: 1rem;\">\u00a0Powsta\u0142a w 1982 roku za spraw\u0105 Philips Semiconductor (obecnie holenderskie przedsi\u0119biorstwo NXP Semiconductors). Jest szeroko stosowana w do\u0142\u0105czaniu peryferyjnych uk\u0142ad\u00f3w scalonych o ni\u017cszej pr\u0119dko\u015bci do procesor\u00f3w i mikrokontroler\u00f3w w komunikacji na kr\u00f3tkich dystansach, zw\u0142aszcza wewn\u0105trz p\u0142yty. Alternatywnie I<\/span>\u00b2<span style=\"font-size: 1rem;\">C jest czasami zapisywane jako I2C (I-two-C) lub IIC.<\/span><\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dbb2b63 elementor-widget elementor-widget-text-editor\" data-id=\"dbb2b63\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>W architekturze komputerowej magistrala albo bus (skr\u00f3t od \u0142aci\u0144skiego <i>omnibus)<\/i>\u00a0jest systemem komunikacyjnym, kt\u00f3ry przenosi dane pomi\u0119dzy komponentami wewn\u0105trz komputera lub pomi\u0119dzy komputerami. Wyra\u017cenie obejmuje wszystkie zwi\u0105zane z tym elementy sprz\u0119towe &#8211; na przyk\u0142ad przew\u00f3d albo \u015bwiat\u0142ow\u00f3d &#8211; i oprogramowanie wraz z protoko\u0142ami.<\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fecd276 elementor-widget elementor-widget-image\" data-id=\"fecd276\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/bus-300x225.jpg\" class=\"attachment-medium size-medium wp-image-21157\" alt=\"Low Pin Count (LPC)\" srcset=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/bus-300x225.jpg 300w, https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/bus.jpg 700w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Chip Winbond - magistrala LPC (Low Pin Count)  zaprezentowana przez Intel w 1998 roku.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62da448 elementor-widget elementor-widget-text-editor\" data-id=\"62da448\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Wczesne magistrale komputerowe by\u0142y r\u00f3wnoleg\u0142ymi przewodami elektrycznymi z wieloma po\u0142\u0105czeniami sprz\u0119towymi, ale termin ten jest obecnie u\u017cywany dla ka\u017cdego fizycznego uk\u0142adu, kt\u00f3ry zapewnia tak\u0105 sam\u0105 funkcj\u0119 logiczn\u0105 jak r\u00f3wnoleg\u0142a magistrala elektryczna. Nowoczesne magistrale komputerowe mog\u0105 wykorzystywa\u0107 zar\u00f3wno po\u0142\u0105czenia r\u00f3wnoleg\u0142e, jak i szeregowe, i mog\u0105 by\u0107 okablowane w topologii multidrop (w kt\u00f3rej wszystkie komponenty s\u0105 po\u0142\u0105czone w obw\u00f3d elektryczny) lub \u0142a\u0144cuchowej, lub te\u017c po\u0142\u0105czone przez prze\u0142\u0105czane koncentratory, jak w przypadku USB.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-834fd3d elementor-widget elementor-widget-heading\" data-id=\"834fd3d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Magistrale dawniej i dzi\u015b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-90b61ef elementor-widget elementor-widget-text-editor\" data-id=\"90b61ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Wczesne komputery zawiera\u0142y wbudowany procesor z lampami, b\u0119ben magnetyczny jako pami\u0119\u0107 g\u0142\u00f3wn\u0105 oraz ta\u015bm\u0119 dziurkowan\u0105 i drukark\u0119 do odczytu i zapisu danych. Nowoczesne systemy maj\u0105 zwykle wielordzeniowy procesor, pami\u0119\u0107 DDR4 SDRAM, dysk do przechowywania danych wt\u00f3rnych, kart\u0119 graficzn\u0105 i <a href=\"\/596-wyswietlacze-lcd-tft-i-ips\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\">wy\u015bwietlacz LCD<\/a>, wreszcie: mysz i klawiatur\u0119 do interakcji oraz \u0142\u0105cze WiFi. W obu przyk\u0142adach magistrale komputerowe w takiej lub innej formie przenosz\u0105 dane mi\u0119dzy wszystkimi tymi urz\u0105dzeniami.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-7366c5f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7366c5f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-d3b3636\" data-id=\"d3b3636\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-caf5f0e elementor-widget elementor-widget-text-editor\" data-id=\"caf5f0e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>W wi\u0119kszo\u015bci tradycyjnych architektur komputerowych procesor i pami\u0119\u0107 g\u0142\u00f3wna s\u0105 ze sob\u0105 \u015bci\u015ble sprz\u0119\u017cone. Mikroprocesor konwencjonalnie jest pojedynczym uk\u0142adem scalonym, kt\u00f3ry posiada szereg po\u0142\u0105cze\u0144 elektrycznych na swoich pinach, kt\u00f3re mog\u0105 by\u0107 u\u017cyte do wyboru &#8220;adresu&#8221; w pami\u0119ci g\u0142\u00f3wnej oraz inny zestaw pin\u00f3w do odczytu i zapisu danych przechowywanych w tej lokalizacji. W wi\u0119kszo\u015bci przypadk\u00f3w procesor i pami\u0119\u0107 maj\u0105 wsp\u00f3lne w\u0142a\u015bciwo\u015bci sygnalizacyjne i dzia\u0142aj\u0105 synchronicznie. Magistrala \u0142\u0105cz\u0105ca CPU i pami\u0119\u0107 jest jedn\u0105 z cech definiuj\u0105cych system i cz\u0119sto okre\u015blana jest po prostu jako magistrala systemowa.<\/p><p>Opracowany na pocz\u0105tku lat 80. standard I2C cechowa\u0142a pr\u0119dko\u015b\u0107 transmisji 100 kbps i 7 bitowa przestrze\u0144 adresowa. Sp\u00f3jrzmy na niego bli\u017cej.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1394c1f\" data-id=\"1394c1f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-de3f08c elementor-widget elementor-widget-image\" data-id=\"de3f08c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"330\" height=\"362\" src=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/i2c-logo.png\" class=\"attachment-large size-large wp-image-21164\" alt=\"\" srcset=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/i2c-logo.png 330w, https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2021\/04\/i2c-logo-273x300.png 273w\" sizes=\"(max-width: 330px) 100vw, 330px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-593fb07 elementor-widget elementor-widget-heading\" data-id=\"593fb07\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">I2C - wprowadzenie<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ceb7218 elementor-widget elementor-widget-text-editor\" data-id=\"ceb7218\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Kilku konkurent\u00f3w, takich jak Siemens (p\u00f3\u017aniej wydzielone z koncernu Infineon Technologies, obecnie dzia\u0142 bada\u0144 Intel Mobile Communications), NEC, Texas Instruments, STMicroelectronics (wcze\u015bniej SGS-Thomson), Motorola (p\u00f3\u017aniej Freescale, obecnie po\u0142\u0105czona z NXP), Nordic Semiconductor i Intersil wprowadzi\u0142y na rynek od po\u0142owy lat 90. kompatybilne produkty I2C. Z kolei System Management Bus (SMBus), zdefiniowana przez firm\u0119 Intel w 1995 roku, jest podzbiorem I2C o bardziej rygorystycznym zastosowaniu. Nowoczesne systemy I2C zawieraj\u0105 pewne zasady i regu\u0142y SMBus, czasami obs\u0142uguj\u0105 zar\u00f3wno I2C jak i SMBus, wymagaj\u0105c jedynie minimalnej rekonfiguracji poprzez wydawanie polece\u0144 lub w\u0142a\u015bciwe u\u017cycie pin\u00f3w wyj\u015bciowych.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ef7478f elementor-widget elementor-widget-heading\" data-id=\"ef7478f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Design interfejsu I2C<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-594834f elementor-widget elementor-widget-text-editor\" data-id=\"594834f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Projekt wzorcowy I2C posiada 7-bitow\u0105 przestrze\u0144 adresow\u0105, z rzadko u\u017cywanym rozszerzeniem 10-bitowym. Typowe pr\u0119dko\u015bci magistrali I2C to tryb standardowy 100 kbit\/s i tryb szybki 400 kbit\/s. Istnieje r\u00f3wnie\u017c tryb niskiej pr\u0119dko\u015bci 10 kbit\/s, ale dozwolone s\u0105 r\u00f3wnie\u017c arbitralnie niskie cz\u0119stotliwo\u015bci zegara. Ostatnie rewizje I2C mog\u0105 obs\u0142ugiwa\u0107 wi\u0119cej w\u0119z\u0142\u00f3w i pracowa\u0107 z wi\u0119kszymi pr\u0119dko\u015bciami (400 kbit\/s tryb Fast, 1 Mbit\/s tryb Fast plus, 3.4 Mbit\/s tryb High Speed i 5 Mbit\/s tryb Ultra Fast). Te pr\u0119dko\u015bci s\u0105 cz\u0119\u015bciej stosowane w systemach wbudowanych ni\u017c w komputerach PC. Typowe napi\u0119cia to 5 V lub 3,3 V, cho\u0107 dopuszczalne s\u0105 systemy z innymi napi\u0119ciami.<\/p><p>Rzeczywista szybko\u015b\u0107 przesy\u0142ania danych u\u017cytkownika jest ni\u017csza ni\u017c wynika\u0142oby to z samych szczytowych szybko\u015bci bitowych. Na przyk\u0142ad, je\u015bli ka\u017cda interakcja z urz\u0105dzeniem podrz\u0119dnym nieefektywnie pozwala na przes\u0142anie tylko 1 bajtu danych, szybko\u015b\u0107 transmisji danych b\u0119dzie mniejsza ni\u017c po\u0142owa szczytowej szybko\u015bci bitowej.<\/p><p>Liczba w\u0119z\u0142\u00f3w, kt\u00f3re mog\u0105 istnie\u0107 na danej magistrali I2C jest ograniczona przez przestrze\u0144 adresow\u0105, a tak\u017ce przez ca\u0142kowit\u0105 pojemno\u015b\u0107 magistrali wynosz\u0105c\u0105 400 pF, kt\u00f3ra ogranicza praktyczne odleg\u0142o\u015bci komunikacyjne do kilku metr\u00f3w. Stosunkowo wysoka impedancja i niska odporno\u015b\u0107 na zak\u0142\u00f3cenia wymaga wsp\u00f3lnego potencja\u0142u masy, co ponownie ogranicza praktyczne zastosowanie do komunikacji w obr\u0119bie tej samej p\u0142yty PC lub ma\u0142ego systemu p\u0142yt.<\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Szyna I2C jest jednym z najpopularniejszych standard\u00f3w lokalnej komunikacji szeregowej w urz\u0105dzeniach cyfrowych. Poznaj podstawy i zastosowania I2C w praktyce!<\/p>\n","protected":false},"author":10,"featured_media":61826,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7,179],"tags":[],"class_list":["post-21153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-elektronika","category-kompendium"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interfejs do kwadratu. Magistrala I2C - co to jest? - Botland<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/botland.com.pl\/blog\/interfejs-do-kwadratu-magistrala-i2c-co-to-jest\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Interfejs do kwadratu. Magistrala I2C - co to jest? - Botland\" \/>\n<meta property=\"og:description\" content=\"Szyna I2C jest jednym z najpopularniejszych standard\u00f3w lokalnej komunikacji szeregowej w urz\u0105dzeniach cyfrowych. 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