{"id":9168,"date":"2025-12-11T15:50:51","date_gmt":"2025-12-11T15:50:51","guid":{"rendered":"https:\/\/www.diyipcb.com\/?post_type=product&#038;p=9168"},"modified":"2026-09-27T15:06:02","modified_gmt":"2026-09-27T15:06:02","slug":"pcf8574-i2c-interface-8bit-io-mcu-expansion-board-i-o-expander-i2c-bus-evaluation-development-module-avr-stm8-c8051f-for-arduino","status":"publish","type":"product","link":"https:\/\/www.diyipcb.com\/ja\/product\/pcf8574-i2c-interface-8bit-io-mcu-expansion-board-i-o-expander-i2c-bus-evaluation-development-module-avr-stm8-c8051f-for-arduino\/","title":{"rendered":"PCF8574 I2C\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9 8\u30d3\u30c3\u30c8IO MCU\u62e1\u5f35\u30dc\u30fc\u30c9 I\/O\u30a8\u30ad\u30b9\u30d1\u30f3\u30c0\u30fc I2C\u30d0\u30b9\u8a55\u4fa1\u958b\u767a\u30e2\u30b8\u30e5\u30fc\u30eb AVR STM8 C8051F Arduino\u7528"},"content":{"rendered":"<p>PCF8574\u306f\u3001I2C\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3059\u308bIO\u30dd\u30fc\u30c8\u62e1\u5f35\u30e2\u30b8\u30e5\u30fc\u30eb\u3067\u3059\u30023\u3064\u306e\u30a2\u30c9\u30ec\u30b9\u30d4\u30f3\u3092\u5099\u3048\u3001\u6700\u59278\u3064\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u540c\u6642\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30dc\u30fc\u30c9\u306b\u306f8\u30d3\u30c3\u30c8\u53cc\u65b9\u5411IO\u30dd\u30fc\u30c8\uff08P0\uff5eP7\uff09\u304c\u642d\u8f09\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u305e\u308c\u30c7\u30fc\u30bf\u65b9\u5411\u5236\u5fa1\u4fe1\u53f7\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u3001\u5165\u529b\u307e\u305f\u306f\u51fa\u529b\u3068\u3057\u3066\u500b\u5225\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96fb\u6e90\u6295\u5165\u6642\u3001\u3059\u3079\u3066\u306eIO\u30ec\u30d9\u30eb\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u30cf\u30a4\u30ec\u30d9\u30eb\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_1.jpg\" \/><\/p>\n<p>\u4f9b\u7d66\u96fb\u5727\uff1a3.3V\/5V<\/p>\n<p>\u901a\u4fe1\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\uff1aI2C\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u30018\u30d3\u30c3\u30c8\u30d1\u30e9\u30ec\u30eb\u30dd\u30fc\u30c8<\/p>\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u30bf\u30a4\u30d7\uff1a\u30d4\u30f3\u307e\u305f\u306f\u30bd\u30b1\u30c3\u30c8<\/p>\n<p>\u5272\u308a\u8fbc\u307f\u51fa\u529b\uff1aMCU\u306e\u5272\u308a\u8fbc\u307f\u30d4\u30f3\u306b\u63a5\u7d9a\u3055\u308c\u3001\u30ed\u30fc\u30ec\u30d9\u30eb\u304c\u6709\u52b9\u3067\u3059\u3002<\/p>\n<p>I2C\u30a2\u30c9\u30ec\u30b9\u8a2d\u5b9a\u624b\u9806<\/p>\n<p>\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306eI2C\u30a2\u30c9\u30ec\u30b9\u306f0x20\u3067\u3059\u3002<\/p>\n<p>\u56f3\u306b\u793a\u3059\u3088\u3046\u306b\u3001I2C\u30a2\u30c9\u30ec\u30b9\u306fA0\uff5eA2\u306e8\u3064\u306e\u7570\u306a\u308b\u30a2\u30c9\u30ec\u30b9\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3059\u3079\u3066\u306e\u30b8\u30e3\u30f3\u30d1\u30fc\u306f\u300c-\u300d\u5074\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001LOW\u306f\u4f4e\u30ec\u30d9\u30eb\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u300c+\u300d\u5074\u306fHIGH\u3001\u3064\u307e\u308a\u9ad8\u30ec\u30d9\u30eb\u3067\u3059\u3002<\/p>\n<p>\u4e0b\u306e\u8868\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u306f0x20\u304b\u30890x27\u307e\u3067\u3067\u3042\u308a\u3001\u3053\u308c\u306f1\u3064\u306e\u958b\u767a\u30dc\u30fc\u30c9\u306b8\u3064\u306ePCF8574\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u540c\u6642\u306b\u63a5\u7d9a\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_2.jpg\" \/><\/p>\n<p><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_3.jpg\" \/><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_4.jpg\" \/><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_5.jpg\" \/><img decoding=\"async\" data-no-lazy=\"1\" loading=\"lazy\" src=\"https:\/\/www.diyipcb.com\/wp-content\/uploads\/module-store-import\/2025\/description_images\/renamed_description_images_filtered\/pcf8574i2c_6.jpg\" \/><\/p>\n<div class=\"simg-pop-btn\" style=\"top: 118px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 865.222px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1490.44px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1490.44px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 2296.67px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 3102.89px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 3909.11px; left: 14px; display: none;\"><\/div>\n<section class=\"module-customization\">\n<h3>\u88fd\u54c1\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/h3>\n<p>\u5f53\u793e\u306f\u88fd\u54c1\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002. <a href=\"https:\/\/www.diyipcb.com\/ja\/contact-us\/\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u304a\u5ba2\u69d8\u306e\u3054\u8981\u671b\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3046\u305f\u3081\u3002.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>PCF8574 is an IO port expansion module that uses the I2C protocol. It has three address pins and can allocate up to 8 addresses simultaneously. The board includes 8-bit bidirectional IO ports (P0-P7), each of which can be separately assigned as an input or output without the need for data direction control signals. When powered on, all IO levels default to high level Supply voltage: 3.3V\/5V Communication interface: I2C interface, 8-bit parallel port Interface type: pin or socket Interrupt output: connected to MCU interrupt pin, low level is valid I2C Address Setting Instructions The default I2C address of the module is 0x20 The I2C address can be set to 8&#8230;<\/p>","protected":false},"featured_media":5200,"comment_status":"open","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":""},"product_brand":[],"product_cat":[94,101,2098],"product_tag":[],"class_list":["post-9168","product","type-product","status-publish","has-post-thumbnail","product_cat-electronic-modules","product_cat-prototyping-expansion","product_cat-prototyping","first","instock","shipping-taxable","purchasable","product-type-simple","entry","content-bg","loop-entry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product\/9168","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/comments?post=9168"}],"version-history":[{"count":0,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product\/9168\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/media\/5200"}],"wp:attachment":[{"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/media?parent=9168"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product_brand?post=9168"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product_cat?post=9168"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.diyipcb.com\/ja\/wp-json\/wp\/v2\/product_tag?post=9168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}