{"id":56,"date":"2026-09-04T18:03:26","date_gmt":"2026-09-04T10:03:26","guid":{"rendered":"https:\/\/www.oldhamburger.cn\/?p=56"},"modified":"2026-09-04T18:32:02","modified_gmt":"2026-09-04T10:32:02","slug":"i2c-iic-communication-guide","status":"publish","type":"post","link":"https:\/\/www.oldhamburger.cn\/index.php\/2026\/09\/04\/i2c-iic-communication-guide\/","title":{"rendered":"I\u00b2C\uff08IIC\uff09\u901a\u4fe1\u8be6\u89e3\uff1a\u4ece\u603b\u7ebf\u539f\u7406\u3001\u65f6\u5e8f\u5230\u5355\u7247\u673a\u5b9e\u6218"},"content":{"rendered":"<p><!--\nTitle: I\u00b2C\uff08IIC\uff09\u901a\u4fe1\u8be6\u89e3\uff1a\u4ece\u603b\u7ebf\u539f\u7406\u3001\u65f6\u5e8f\u5230\u5355\u7247\u673a\u5b9e\u6218\nSlug: i2c-iic-communication-guide\n--><\/p>\n<p>I\u00b2C \u662f\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d\u6700\u5e38\u89c1\u7684\u677f\u7ea7\u901a\u4fe1\u603b\u7ebf\u4e4b\u4e00\u3002\u53ea\u7528 SDA \u548c SCL \u4e24\u6839\u4fe1\u53f7\u7ebf\uff0c\u4e00\u4e2a\u63a7\u5236\u5668\u5c31\u80fd\u8fde\u63a5\u4f20\u611f\u5668\u3001EEPROM\u3001RTC\u3001OLED \u7b49\u591a\u4e2a\u5668\u4ef6\u3002\u56fd\u5185\u5f00\u53d1\u8005\u4e5f\u5e38\u628a\u5b83\u5199\u6210 IIC\uff1b\u672c\u6587\u7edf\u4e00\u4f7f\u7528\u89c4\u8303\u5199\u6cd5 I\u00b2C\u3002<\/p>\n<p>\u5b83\u7684\u5f15\u811a\u5c11\u3001\u5bfb\u5740\u6e05\u6670\u3001\u5916\u8bbe\u751f\u6001\u6210\u719f\uff0c\u4f46\u201c\u80fd\u770b\u5230\u65f6\u949f\u201d\u5e76\u4e0d\u7b49\u4e8e\u201c\u901a\u4fe1\u4e00\u5b9a\u6b63\u786e\u201d\u3002\u5730\u5740\u5199\u6cd5\u3001\u4e0a\u62c9\u7535\u963b\u3001\u603b\u7ebf\u7535\u5bb9\u3001ACK\u3001\u91cd\u590d\u8d77\u59cb\u548c\u65f6\u949f\u62c9\u4f38\uff0c\u90fd\u662f\u5b9e\u9645\u8c03\u8bd5\u4e2d\u6700\u5bb9\u6613\u8e29\u5751\u7684\u5730\u65b9\u3002\u4e0b\u9762\u4ece\u7535\u6c14\u7ed3\u6784\u5f00\u59cb\uff0c\u5b8c\u6574\u8d70\u4e00\u904d I\u00b2C\u3002<\/p>\n<h2>\u4e00\u3001I\u00b2C \u603b\u7ebf\u7531\u4ec0\u4e48\u7ec4\u6210<\/h2>\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/www.oldhamburger.cn\/wp-content\/uploads\/2026\/09\/i2c-bus-topology.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/www.oldhamburger.cn\/wp-content\/uploads\/2026\/09\/i2c-bus-topology.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"I2C \u603b\u7ebf\u5178\u578b\u8fde\u63a5\u62d3\u6251\uff0cSDA \u548c SCL \u5404\u81ea\u901a\u8fc7\u4e0a\u62c9\u7535\u963b\u8fde\u63a5 3.3V\uff0c\u5e76\u8fde\u63a5 MCU\u3001\u4f20\u611f\u5668\u3001EEPROM \u548c OLED\" \/><\/div><figcaption>I\u00b2C \u5178\u578b\u8fde\u63a5\uff1a\u6240\u6709\u5668\u4ef6\u5171\u4eab SDA \u4e0e SCL\uff0c\u6bcf\u6839\u7ebf\u90fd\u9700\u8981\u4e0a\u62c9\u7535\u963b\u3002<\/figcaption><\/figure>\n<p>I\u00b2C \u662f\u540c\u6b65\u4e32\u884c\u603b\u7ebf\u3002SCL \u63d0\u4f9b\u65f6\u949f\uff0cSDA \u4f20\u8f93\u6570\u636e\u3002\u603b\u7ebf\u901a\u5e38\u7531\u4e00\u4e2a\u63a7\u5236\u5668\u53d1\u8d77\u4e8b\u52a1\uff0c\u76ee\u6807\u5668\u4ef6\u6839\u636e\u5730\u5740\u54cd\u5e94\u3002NXP \u6700\u65b0\u89c4\u8303\u4f7f\u7528 <strong>Controller\/Target<\/strong> \u63cf\u8ff0\u8fd9\u4e24\u4e2a\u89d2\u8272\uff0c\u5f88\u591a\u65e7\u8d44\u6599\u4e2d\u4ecd\u4f1a\u770b\u5230 Master\/Slave\uff0c\u5b83\u4eec\u6307\u7684\u662f\u540c\u4e00\u7ec4\u89d2\u8272\u3002<\/p>\n<p>\u540c\u4e00\u603b\u7ebf\u4e0a\u7684\u76ee\u6807\u5668\u4ef6\u5fc5\u987b\u4f7f\u7528\u4e0d\u51b2\u7a81\u7684\u5730\u5740\u3002\u56fe\u4e2d\u7684\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u3001EEPROM \u548c OLED \u867d\u7136\u5171\u7528\u4e24\u6839\u7ebf\uff0c\u4f46\u63a7\u5236\u5668\u80fd\u591f\u901a\u8fc7\u5730\u5740\u9009\u62e9\u5176\u4e2d\u4e00\u4e2a\u5668\u4ef6\u3002<\/p>\n<h2>\u4e8c\u3001\u4e3a\u4ec0\u4e48 SDA \u548c SCL \u90fd\u8981\u4e0a\u62c9<\/h2>\n<p>I\u00b2C \u5f15\u811a\u901a\u5e38\u91c7\u7528\u5f00\u6f0f\uff08Open-drain\uff09\u7ed3\u6784\uff1a\u5668\u4ef6\u53ef\u4ee5\u4e3b\u52a8\u628a\u603b\u7ebf\u62c9\u4f4e\uff0c\u5374\u4e0d\u4f1a\u4e3b\u52a8\u8f93\u51fa\u9ad8\u7535\u5e73\u3002\u6ca1\u6709\u5668\u4ef6\u62c9\u4f4e\u65f6\uff0c\u5916\u90e8\u4e0a\u62c9\u7535\u963b\u628a\u603b\u7ebf\u6062\u590d\u4e3a\u9ad8\u7535\u5e73\u3002\u56e0\u6b64\uff0c\u603b\u7ebf\u4e0a\u7684\u9ad8\u7535\u5e73\u5b9e\u9645\u8868\u793a\u201c\u6240\u6709\u5668\u4ef6\u90fd\u91ca\u653e\u4e86\u8fd9\u6839\u7ebf\u201d\u3002<\/p>\n<p>\u8fd9\u79cd\u7ed3\u6784\u5e26\u6765\u4e24\u4e2a\u5173\u952e\u80fd\u529b\uff1a<\/p>\n<ul>\n<li><strong>\u7ebf\u4e0e\u903b\u8f91\uff1a<\/strong>\u4efb\u4f55\u4e00\u4e2a\u5668\u4ef6\u62c9\u4f4e\uff0c\u603b\u7ebf\u8bfb\u5230\u7684\u5c31\u662f\u4f4e\u7535\u5e73\uff0c\u907f\u514d\u591a\u4e2a\u5668\u4ef6\u76f4\u63a5\u63a8\u633d\u5bf9\u6253\u3002<\/li>\n<li><strong>\u591a\u5668\u4ef6\u534f\u4f5c\uff1a<\/strong>ACK\u3001\u65f6\u949f\u62c9\u4f38\u548c\u591a\u63a7\u5236\u5668\u4ef2\u88c1\uff0c\u90fd\u5efa\u7acb\u5728\u201c\u4f4e\u7535\u5e73\u4f18\u5148\u201d\u7684\u7535\u6c14\u7279\u6027\u4e0a\u3002<\/li>\n<\/ul>\n<blockquote class=\"wp-block-quote\"><p>\u5e38\u89c1\u7684 4.7 k\u03a9 \u53ea\u662f\u7ecf\u9a8c\u8d77\u70b9\uff0c\u5e76\u4e0d\u662f\u6240\u6709 I\u00b2C \u7535\u8def\u7684\u56fa\u5b9a\u7b54\u6848\u3002\u901f\u5ea6\u8d8a\u5feb\u3001\u8d70\u7ebf\u8d8a\u957f\u3001\u5668\u4ef6\u8d8a\u591a\uff0c\u603b\u7ebf\u7535\u5bb9\u8d8a\u5927\uff0c\u5bf9\u4e0a\u62c9\u7535\u963b\u7684\u8981\u6c42\u5c31\u8d8a\u4e25\u683c\u3002<\/p><\/blockquote>\n<h2>\u4e09\u3001START\u3001STOP \u4e0e\u6570\u636e\u91c7\u6837<\/h2>\n<p>\u603b\u7ebf\u7a7a\u95f2\u65f6\uff0cSDA \u548c SCL \u90fd\u4fdd\u6301\u9ad8\u7535\u5e73\u3002\u4e00\u6b21\u4e8b\u52a1\u7531\u63a7\u5236\u5668\u4ea7\u751f START \u6761\u4ef6\u5f00\u59cb\uff0c\u5e76\u7531 STOP \u6761\u4ef6\u7ed3\u675f\uff1a<\/p>\n<ul>\n<li><strong>START\uff1a<\/strong>SCL \u4e3a\u9ad8\u7535\u5e73\u65f6\uff0cSDA \u4ece\u9ad8\u53d8\u4f4e\u3002<\/li>\n<li><strong>STOP\uff1a<\/strong>SCL \u4e3a\u9ad8\u7535\u5e73\u65f6\uff0cSDA \u4ece\u4f4e\u53d8\u9ad8\u3002<\/li>\n<li><strong>\u666e\u901a\u6570\u636e\u4f4d\uff1a<\/strong>SDA \u5e94\u5728 SCL \u4f4e\u7535\u5e73\u671f\u95f4\u6539\u53d8\uff0c\u5728 SCL \u9ad8\u7535\u5e73\u671f\u95f4\u4fdd\u6301\u7a33\u5b9a\u3002<\/li>\n<li><strong>\u53d1\u9001\u987a\u5e8f\uff1a<\/strong>\u6bcf\u4e2a\u5b57\u8282\u90fd\u4ece\u6700\u9ad8\u4f4d MSB \u5f00\u59cb\u4f20\u8f93\u3002<\/li>\n<\/ul>\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/www.oldhamburger.cn\/wp-content\/uploads\/2026\/09\/i2c-write-frame-timing.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/www.oldhamburger.cn\/wp-content\/uploads\/2026\/09\/i2c-write-frame-timing.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"I2C \u5199\u5e27\u65f6\u5e8f\u56fe\uff0c\u5411 7 \u4f4d\u5730\u5740 0x3C \u5199\u5165\u6570\u636e 0xA5\uff0c\u5305\u542b START\u3001\u5730\u5740\u3001\u5199\u65b9\u5411\u4f4d\u3001ACK\u3001\u6570\u636e\u4e0e STOP\" \/><\/div><figcaption>\u5411 7 \u4f4d\u5730\u5740 0x3C \u5199\u5165 0xA5\uff1a\u6bcf\u4f20\u8f93 8 \u4f4d\uff0c\u63a5\u6536\u65b9\u5728\u7b2c 9 \u4e2a\u65f6\u949f\u7ed9\u51fa ACK \u6216 NACK\u3002<\/figcaption><\/figure>\n<h2>\u56db\u3001\u5730\u5740\u3001\u65b9\u5411\u4f4d\u4e0e ACK<\/h2>\n<p>\u6700\u5e38\u89c1\u7684 I\u00b2C \u5730\u5740\u957f\u5ea6\u662f 7 \u4f4d\u3002START \u4e4b\u540e\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u7531\u201c7 \u4f4d\u5730\u5740 + 1 \u4f4d\u8bfb\u5199\u65b9\u5411\u201d\u7ec4\u6210\uff1a\u65b9\u5411\u4f4d\u4e3a 0 \u8868\u793a\u5199\uff0c\u4e3a 1 \u8868\u793a\u8bfb\u3002\u7d27\u63a5\u7740\u7684\u7b2c 9 \u4e2a\u65f6\u949f\u7528\u4e8e\u5e94\u7b54\u3002<\/p>\n<ul>\n<li><strong>ACK\uff1a<\/strong>\u63a5\u6536\u65b9\u5728\u7b2c 9 \u4e2a\u65f6\u949f\u628a SDA \u62c9\u4f4e\uff0c\u8868\u793a\u5df2\u63a5\u6536\u3002<\/li>\n<li><strong>NACK\uff1a<\/strong>SDA \u4fdd\u6301\u9ad8\u7535\u5e73\uff0c\u53ef\u80fd\u8868\u793a\u5730\u5740\u65e0\u4eba\u54cd\u5e94\u3001\u76ee\u6807\u5668\u4ef6\u5c1a\u672a\u51c6\u5907\u597d\uff0c\u6216\u8005\u8bfb\u53d6\u65b9\u4e0d\u518d\u9700\u8981\u66f4\u591a\u5b57\u8282\u3002<\/li>\n<\/ul>\n<h3>\u6700\u5e38\u89c1\u7684\u5730\u5740\u6df7\u6dc6<\/h3>\n<p>\u5047\u8bbe\u5668\u4ef6\u7684 7 \u4f4d\u5730\u5740\u662f <code>0x3C<\/code>\uff0c\u653e\u5165\u603b\u7ebf\u9996\u5b57\u8282\u540e\uff0c\u5199\u5730\u5740\u5b57\u8282\u662f <code>0x78<\/code>\uff0c\u8bfb\u5730\u5740\u5b57\u8282\u662f <code>0x79<\/code>\u3002\u6709\u4e9b\u6570\u636e\u624b\u518c\u7ed9 7 \u4f4d\u5730\u5740\uff0c\u6709\u4e9b\u65e7\u4ee3\u7801\u76f4\u63a5\u7ed9\u5de6\u79fb\u540e\u7684 8 \u4f4d\u5730\u5740\u3002\u8c03\u7528\u9a71\u52a8\u524d\u4e00\u5b9a\u8981\u786e\u8ba4 API \u9700\u8981\u54ea\u4e00\u79cd\uff1b\u591a\u6570\u73b0\u4ee3 HAL \u63a5\u53e3\u8981\u6c42\u4f20\u5165 7 \u4f4d\u5730\u5740\uff0c\u4f46\u4e5f\u6709\u63a5\u53e3\u8981\u6c42\u8c03\u7528\u8005\u81ea\u884c\u5de6\u79fb\u3002<\/p>\n<h2>\u4e94\u3001\u5178\u578b\u7684\u5bc4\u5b58\u5668\u8bfb\u5199\u6d41\u7a0b<\/h2>\n<h3>\u5199\u4e00\u4e2a\u5bc4\u5b58\u5668<\/h3>\n<pre class=\"wp-block-code\"><code>START\n  -&gt; \u5730\u5740 + W -&gt; ACK\n  -&gt; \u5bc4\u5b58\u5668\u5730\u5740 -&gt; ACK\n  -&gt; \u6570\u636e -&gt; ACK\n  -&gt; STOP<\/code><\/pre>\n<h3>\u8bfb\u53d6\u4e00\u4e2a\u5bc4\u5b58\u5668<\/h3>\n<pre class=\"wp-block-code\"><code>START\n  -&gt; \u5730\u5740 + W -&gt; ACK\n  -&gt; \u5bc4\u5b58\u5668\u5730\u5740 -&gt; ACK\n  -&gt; REPEATED START\n  -&gt; \u5730\u5740 + R -&gt; ACK\n  -&gt; \u6570\u636e -&gt; NACK\n  -&gt; STOP<\/code><\/pre>\n<p>\u8bfb\u53d6\u5bc4\u5b58\u5668\u65f6\uff0c\u524d\u534a\u6bb5\u5199\u5165\u7684\u662f\u201c\u63a5\u4e0b\u6765\u8981\u8bfb\u54ea\u4e2a\u5bc4\u5b58\u5668\u201d\u3002\u968f\u540e\u63a7\u5236\u5668\u53d1\u51fa\u91cd\u590d\u8d77\u59cb\uff08Repeated START\uff09\uff0c\u4e0d\u91ca\u653e\u603b\u7ebf\u4fbf\u5207\u6362\u5230\u8bfb\u65b9\u5411\u3002\u8bfb\u53d6\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u540e\uff0c\u63a7\u5236\u5668\u53d1\u9001 NACK\uff0c\u544a\u8bc9\u76ee\u6807\u5668\u4ef6\u8bfb\u53d6\u7ed3\u675f\uff0c\u518d\u4ea7\u751f STOP\u3002<\/p>\n<h2>\u516d\u3001\u5e38\u89c1\u901f\u7387\u6a21\u5f0f<\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>\u6a21\u5f0f<\/th>\n<th>\u6700\u9ad8\u901f\u7387<\/th>\n<th>\u5e38\u89c1\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Standard-mode<\/td>\n<td>100 kbit\/s<\/td>\n<td>\u517c\u5bb9\u6027\u4f18\u5148\u3001\u4f4e\u901f\u4f20\u611f\u5668<\/td>\n<\/tr>\n<tr>\n<td>Fast-mode<\/td>\n<td>400 kbit\/s<\/td>\n<td>\u5e38\u89c1 MCU \u4e0e\u663e\u793a\u3001\u4f20\u611f\u5668<\/td>\n<\/tr>\n<tr>\n<td>Fast-mode Plus<\/td>\n<td>1 Mbit\/s<\/td>\n<td>\u652f\u6301 Fm+ \u7684\u9ad8\u901f\u5668\u4ef6<\/td>\n<\/tr>\n<tr>\n<td>High-speed mode<\/td>\n<td>3.4 Mbit\/s<\/td>\n<td>\u5bf9\u5668\u4ef6\u548c\u603b\u7ebf\u8bbe\u8ba1\u8981\u6c42\u8f83\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>Ultra Fast-mode<\/td>\n<td>5 Mbit\/s<\/td>\n<td>\u5355\u5411\u4f20\u8f93\uff0c\u4f7f\u7528\u573a\u666f\u8f83\u5c11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>\u5b9e\u9645\u901f\u7387\u4e0d\u80fd\u53ea\u770b MCU \u80fd\u8dd1\u591a\u5feb\uff0c\u8fd8\u8981\u786e\u8ba4\u603b\u7ebf\u4e0a\u6bcf\u4e00\u4e2a\u5668\u4ef6\u3001\u53cc\u5411\u7535\u5e73\u8f6c\u6362\u5668\u3001\u4e0a\u62c9\u7f51\u7edc\u548c\u8d70\u7ebf\u7535\u5bb9\u90fd\u652f\u6301\u8be5\u6a21\u5f0f\u3002\u5bf9\u5e38\u89c1\u5f00\u53d1\u677f\u6765\u8bf4\uff0c100 kHz \u548c 400 kHz \u901a\u5e38\u6700\u5b9e\u7528\u3002<\/p>\n<h2>\u4e03\u3001\u65f6\u949f\u62c9\u4f38\u4e0e\u591a\u63a7\u5236\u5668\u4ef2\u88c1<\/h2>\n<p>\u76ee\u6807\u5668\u4ef6\u5982\u679c\u6682\u65f6\u6765\u4e0d\u53ca\u5904\u7406\u6570\u636e\uff0c\u53ef\u4ee5\u628a SCL \u4fdd\u6301\u5728\u4f4e\u7535\u5e73\uff0c\u8fd9\u53eb\u65f6\u949f\u62c9\u4f38\uff08Clock Stretching\uff09\u3002\u63a7\u5236\u5668\u91ca\u653e SCL \u540e\uff0c\u5e94\u8bfb\u53d6\u5f15\u811a\u7684\u771f\u5b9e\u7535\u5e73\uff0c\u7b49\u5b83\u786e\u5b9e\u53d8\u9ad8\u518d\u7ee7\u7eed\u3002\u4f7f\u7528\u786c\u4ef6 I\u00b2C \u5916\u8bbe\u65f6\uff0c\u9700\u8981\u786e\u8ba4\u63a7\u5236\u5668\u53ca\u5176\u9a71\u52a8\u662f\u5426\u652f\u6301\u76ee\u6807\u5668\u4ef6\u8981\u6c42\u7684\u62c9\u4f38\u884c\u4e3a\u3002<\/p>\n<p>\u5728\u591a\u63a7\u5236\u5668\u7cfb\u7edf\u4e2d\uff0c\u591a\u4e2a\u63a7\u5236\u5668\u53ef\u80fd\u540c\u65f6\u53d1\u8d77\u901a\u4fe1\u3002\u4ef2\u88c1\u540c\u6837\u5229\u7528\u7ebf\u4e0e\u903b\u8f91\uff1a\u4e00\u4e2a\u63a7\u5236\u5668\u91ca\u653e SDA\u3001\u51c6\u5907\u53d1\u9001 1\uff0c\u5374\u8bfb\u5230\u4f4e\u7535\u5e73\uff0c\u8bf4\u660e\u53e6\u4e00\u4e2a\u63a7\u5236\u5668\u6b63\u5728\u53d1\u9001 0\uff0c\u6b64\u65f6\u524d\u8005\u5931\u53bb\u4ef2\u88c1\u5e76\u505c\u6b62\u9a71\u52a8\u3002\u666e\u901a\u5355\u63a7\u5236\u5668\u9879\u76ee\u901a\u5e38\u9047\u4e0d\u5230\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u4f46\u7406\u89e3\u5b83\u6709\u52a9\u4e8e\u89e3\u91ca I\u00b2C \u4e3a\u4ec0\u4e48\u5fc5\u987b\u4f7f\u7528\u5f00\u6f0f\u7ed3\u6784\u3002<\/p>\n<h2>\u516b\u3001\u4e0a\u62c9\u7535\u963b\u600e\u4e48\u9009<\/h2>\n<p>\u7535\u963b\u592a\u5c0f\uff0c\u4f1a\u8ba9\u5668\u4ef6\u62c9\u4f4e\u65f6\u627f\u53d7\u8fc7\u5927\u7684\u704c\u7535\u6d41\uff1b\u7535\u963b\u592a\u5927\uff0c\u53c8\u4f1a\u4f7f RC \u4e0a\u5347\u6cbf\u8fc7\u6162\u3002TI \u7684\u5e94\u7528\u8bf4\u660e\u7ed9\u51fa\u4e86\u5b9e\u7528\u8fb9\u754c\uff1a<\/p>\n<pre class=\"wp-block-code\"><code>R\u209a(min) = (VCC - VOL(max)) \/ IOL\nR\u209a(max) = tr \/ (0.8473 \u00d7 Cb)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>tr<\/code> \u662f\u89c4\u8303\u5141\u8bb8\u7684\u6700\u5927\u4e0a\u5347\u65f6\u95f4\uff0c<code>Cb<\/code> \u662f\u603b\u7ebf\u603b\u7535\u5bb9\u3002\u4e3e\u4f8b\uff1a3.3 V \u603b\u7ebf\u3001<code>VOL(max)=0.4 V<\/code>\u3001\u5141\u8bb8\u704c\u7535\u6d41 3 mA\uff0c\u5219\u6700\u5c0f\u503c\u7ea6\u4e3a 967 \u03a9\uff1b\u82e5 Fast-mode \u7684\u4e0a\u5347\u65f6\u95f4\u6309 300 ns\u3001\u603b\u7ebf\u7535\u5bb9\u7ea6 100 pF \u4f30\u7b97\uff0c\u6700\u5927\u503c\u7ea6\u4e3a 3.54 k\u03a9\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53ef\u4ece 2.2 k\u03a9 \u6216 3.3 k\u03a9 \u5f00\u59cb\u9a8c\u8bc1\u3002<\/p>\n<p>\u8fd8\u8981\u6ce8\u610f\uff0c\u5f00\u53d1\u677f\u548c\u6a21\u5757\u4e0a\u53ef\u80fd\u5df2\u7ecf\u710a\u6709\u4e0a\u62c9\u7535\u963b\u3002\u591a\u4e2a\u6a21\u5757\u7684\u4e0a\u62c9\u4f1a\u5e76\u8054\uff0c\u4f8b\u5982\u4e24\u7ec4 4.7 k\u03a9 \u5e76\u8054\u540e\u7b49\u6548\u7ea6 2.35 k\u03a9\u3002\u6700\u7ec8\u5e94\u7ed3\u5408\u5668\u4ef6\u624b\u518c\uff0c\u5e76\u7528\u793a\u6ce2\u5668\u89c2\u5bdf SDA\u3001SCL \u7684\u4f4e\u7535\u5e73\u548c\u4e0a\u5347\u6cbf\u3002<\/p>\n<h2>\u4e5d\u3001\u4e00\u4e2a\u7b80\u5316\u7684\u5199\u5bc4\u5b58\u5668\u793a\u4f8b<\/h2>\n<pre class=\"wp-block-code\"><code>bool i2c_write_register(uint8_t address7,\n                        uint8_t reg,\n                        uint8_t value)\n{\n    if (!i2c_start()) return false;\n\n    if (!i2c_write_byte((address7 &lt;&lt; 1) | 0u)) goto fail;\n    if (!i2c_write_byte(reg)) goto fail;\n    if (!i2c_write_byte(value)) goto fail;\n\n    i2c_stop();\n    return true;\n\nfail:\n    i2c_stop();\n    return false;\n}<\/code><\/pre>\n<p>\u8fd9\u6bb5\u4f2a\u4ee3\u7801\u5c55\u793a\u7684\u662f\u603b\u7ebf\u4e8b\u52a1\uff0c\u4e0d\u5bf9\u5e94\u67d0\u4e2a\u5177\u4f53\u82af\u7247\u3002\u5b9e\u9645\u5de5\u7a0b\u4f18\u5148\u4f7f\u7528 MCU \u7684\u786c\u4ef6 I\u00b2C \u5916\u8bbe\u548c\u7ecf\u8fc7\u9a8c\u8bc1\u7684 HAL\/\u9a71\u52a8\uff0c\u5e76\u8865\u5145\u8d85\u65f6\u3001\u9519\u8bef\u7801\u3001\u603b\u7ebf\u6062\u590d\u548c\u5e76\u53d1\u4fdd\u62a4\u3002<\/p>\n<h2>\u5341\u3001\u5e38\u89c1\u6545\u969c\u4e0e\u6392\u67e5\u987a\u5e8f<\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>\u73b0\u8c61<\/th>\n<th>\u4f18\u5148\u68c0\u67e5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5730\u5740\u540e\u6ca1\u6709 ACK<\/td>\n<td>7 \u4f4d\/8 \u4f4d\u5730\u5740\u662f\u5426\u6df7\u7528\uff1b\u4f9b\u7535\u3001\u5171\u5730\u3001\u5f15\u811a\u590d\u7528\u548c\u4e0a\u62c9\u662f\u5426\u6b63\u786e<\/td>\n<\/tr>\n<tr>\n<td>SDA \u4e00\u76f4\u4e3a\u4f4e<\/td>\n<td>\u76ee\u6807\u5668\u4ef6\u662f\u5426\u5728\u4f20\u8f93\u4e2d\u590d\u4f4d\uff1b\u5148\u590d\u4f4d\u5668\u4ef6\uff0c\u5fc5\u8981\u65f6\u8f93\u51fa 9 \u4e2a SCL \u8109\u51b2\u540e\u518d\u4ea7\u751f STOP<\/td>\n<\/tr>\n<tr>\n<td>\u4e0a\u5347\u6cbf\u7f13\u6162<\/td>\n<td>\u51cf\u5c0f\u4e0a\u62c9\u963b\u503c\u3001\u7f29\u77ed\u8d70\u7ebf\u3001\u51cf\u5c11\u5668\u4ef6\u548c\u8fde\u63a5\u7ebf\u5e26\u6765\u7684\u7535\u5bb9<\/td>\n<\/tr>\n<tr>\n<td>100 kHz \u6b63\u5e38\uff0c400 kHz \u5931\u8d25<\/td>\n<td>\u4e0a\u5347\u65f6\u95f4\u3001\u5e03\u7ebf\u3001\u7535\u5e73\u8f6c\u6362\u5668\u3001\u76ee\u6807\u5668\u4ef6\u901f\u7387\u4e0a\u9650<\/td>\n<\/tr>\n<tr>\n<td>\u5076\u53d1\u9519\u7801\u6216\u8bfb\u6570\u8df3\u53d8<\/td>\n<td>\u903b\u8f91\u7535\u5e73\u9608\u503c\u3001\u4f9b\u7535\u566a\u58f0\u3001\u4fe1\u53f7\u5b8c\u6574\u6027\u3001\u65f6\u949f\u62c9\u4f38\u548c\u8f6f\u4ef6\u8d85\u65f6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>\u63a8\u8350\u4f7f\u7528\u903b\u8f91\u5206\u6790\u4eea\u6216\u793a\u6ce2\u5668\u6309\u4ee5\u4e0b\u987a\u5e8f\u89c2\u5bdf\uff1a\u5148\u786e\u8ba4\u7a7a\u95f2\u7535\u5e73\uff0c\u518d\u627e START\uff0c\u7136\u540e\u68c0\u67e5\u5730\u5740\u4e0e\u65b9\u5411\u4f4d\uff0c\u6700\u540e\u770b\u7b2c 9 \u4e2a\u65f6\u949f\u662f\u5426\u51fa\u73b0 ACK\u3002\u628a\u95ee\u9898\u5b9a\u4f4d\u5230\u201c\u7535\u6c14\u5c42\u3001\u5730\u5740\u5c42\u8fd8\u662f\u6570\u636e\u5c42\u201d\uff0c\u901a\u5e38\u6bd4\u53cd\u590d\u4fee\u6539\u9a71\u52a8\u4ee3\u7801\u66f4\u5feb\u3002<\/p>\n<h2>\u5341\u4e00\u3001\u8fde\u63a5\u524d\u7684\u5feb\u901f\u68c0\u67e5\u8868<\/h2>\n<ul>\n<li>SDA\u3001SCL \u662f\u5426\u63a5\u5bf9\uff0c\u6240\u6709\u5668\u4ef6\u662f\u5426\u5171\u5730\u3002<\/li>\n<li>\u603b\u7ebf\u7535\u538b\u662f\u5426\u6ee1\u8db3\u6bcf\u4e2a\u5668\u4ef6\u7684\u8f93\u5165\u9608\u503c\uff0c\u8de8\u7535\u538b\u57df\u65f6\u662f\u5426\u4f7f\u7528\u5408\u9002\u7684\u53cc\u5411\u8f6c\u6362\u5668\u3002<\/li>\n<li>SDA\u3001SCL \u662f\u5426\u90fd\u6709\u4e0a\u62c9\uff0c\u7b49\u6548\u963b\u503c\u662f\u5426\u5408\u7406\u3002<\/li>\n<li>\u5730\u5740\u662f 7 \u4f4d\u8fd8\u662f\u5df2\u7ecf\u5de6\u79fb\u7684 8 \u4f4d\u8868\u793a\u3002<\/li>\n<li>\u76ee\u6807\u5668\u4ef6\u7684\u5730\u5740\u9009\u62e9\u811a\u3001\u590d\u4f4d\u811a\u548c\u542f\u52a8\u5ef6\u65f6\u662f\u5426\u7b26\u5408\u624b\u518c\u3002<\/li>\n<li>\u901f\u7387\u3001\u65f6\u949f\u62c9\u4f38\u3001\u91cd\u590d\u8d77\u59cb\u662f\u5426\u88ab\u63a7\u5236\u5668\u9a71\u52a8\u6b63\u786e\u652f\u6301\u3002<\/li>\n<\/ul>\n<h2>\u7ed3\u8bed<\/h2>\n<p>I\u00b2C \u7684\u534f\u8bae\u5e76\u4e0d\u590d\u6742\uff1a\u4e24\u6839\u5f00\u6f0f\u4fe1\u53f7\u7ebf\u3001START\/STOP\u3001\u6309\u5b57\u8282\u4f20\u8f93\u4ee5\u53ca\u6bcf\u5b57\u8282\u540e\u7684 ACK\u3002\u4f46\u771f\u6b63\u7a33\u5b9a\u7684\u7cfb\u7edf\uff0c\u8fd8\u4f9d\u8d56\u6b63\u786e\u7684\u7535\u6c14\u8bbe\u8ba1\u548c\u6e05\u6670\u7684\u9519\u8bef\u5904\u7406\u3002\u7406\u89e3\u201c\u8c01\u5728\u62c9\u4f4e\u603b\u7ebf\u3001\u4ec0\u4e48\u65f6\u5019\u91c7\u6837\u3001\u4e3a\u4ec0\u4e48\u6ca1\u6709 ACK\u201d\uff0c\u5c31\u80fd\u628a\u5927\u591a\u6570 I\u00b2C \u6545\u969c\u4ece\u731c\u6d4b\u53d8\u6210\u53ef\u6d4b\u91cf\u3001\u53ef\u5b9a\u4f4d\u7684\u95ee\u9898\u3002<\/p>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nxp.com\/docs\/en\/user-guide\/UM10204.pdf\" target=\"_blank\" rel=\"noopener\">NXP\uff1aUM10204 I\u00b2C-bus specification and user manual<\/a><\/li>\n<li><a href=\"https:\/\/www.ti.com\/lit\/an\/slva689\/slva689.pdf\" target=\"_blank\" rel=\"noopener\">Texas Instruments\uff1aI2C Bus Pullup Resistor Calculation<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4ece\u5f00\u6f0f\u4e0e\u4e0a\u62c9\u3001START\/STOP\u3001\u5730\u5740\u548c ACK\uff0c\u5230\u5bc4\u5b58\u5668\u8bfb\u5199\u3001\u4e0a\u62c9\u7535\u963b\u8ba1\u7b97\u4e0e\u6545\u969c\u6392\u67e5\uff0c\u7cfb\u7edf\u638c\u63e1 I\u00b2C\uff08IIC\uff09\u901a\u4fe1\u3002<\/p>\n","protected":false},"author":2,"featured_media":53,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10,11,13,12,14],"class_list":["post-56","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-i2c","tag-iic","tag-13","tag-12","tag-14"],"_links":{"self":[{"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/posts\/56","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/comments?post=56"}],"version-history":[{"count":2,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/posts\/56\/revisions"}],"predecessor-version":[{"id":58,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/posts\/56\/revisions\/58"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/media\/53"}],"wp:attachment":[{"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/media?parent=56"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/categories?post=56"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oldhamburger.cn\/index.php\/wp-json\/wp\/v2\/tags?post=56"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}