{"id":10232,"date":"2022-10-08T11:01:28","date_gmt":"2022-10-08T03:01:28","guid":{"rendered":"http:\/\/www.szryc.com\/?p=10232"},"modified":"2022-10-08T11:01:28","modified_gmt":"2022-10-08T03:01:28","slug":"i2c%e6%8e%a5%e5%8f%a3%e7%9a%84%e4%b8%8a%e6%8b%89%e7%94%b5%e9%98%bb%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=10232","title":{"rendered":"I2C\u63a5\u53e3\u7684\u4e0a\u62c9\u7535\u963b\u95ee\u9898"},"content":{"rendered":"
\u5728\u4e00\u4e9bPCB\u7684layout\u4e2d\uff0c\u5927\u5bb6\u5f80\u5f80\u4f1a\u770b\u5230\u5728I2C<\/u>\u901a\u4fe1\u7684\u63a5\u53e3\u5904\uff0c\u5f80\u5f80\u4f1a\u63a5\u5165\u4e00\u4e2a4.7K\u7684\u7535\u963b\uff0c\u6709\u7684datasheet\u4e0a\u9762\u660e\u786e\u6709\u8981\u6c42\uff0c\u9700\u8981\u63a5\u5165\uff0c\u6709\u7684\u5219\u6ca1\u6709\u8981\u6c42\u3002<\/p>\n
I2C\u63a5\u53e3<\/strong><\/p>\n \u5bf9\u4e8e\u5355\u7247\u673a<\/u>\u6765\u8bb2\uff0c\u6709\u4e9bIO\u5185\u90e8\u7684\u4e0a\u62c9\u7535\u963b\u53ef\u4ee5\u4f7f\u80fd\uff0c\u8fd9\u6837\u5c31\u7701\u53bb\u4e86\u5916\u90e8\u7684\u4e0a\u62c9\u7535\u963b\uff0c\u8fd9\u662f\u5bf9\u4e8e\u5355\u7247\u673a\u5e26\u6709\u6807\u51c6I2C\u901a\u4fe1\u534f\u8bae\u63a5\u53e3\uff0c\u82e5\u662f\u53ea\u5e26\u6709\u6a21\u62dfI2C\u534f\u8bae\u63a5\u53e3\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u8003\u8651\u63a5\u5165\u4e0a\u62c9\u7535\u963b\u95ee\u9898\u3002\u4e0b\u56fe\u662f\u6444\u50cf\u5934\u8fdb\u884c\u914d\u7f6e\u901a\u4fe1\u65f6SCL\u548cSDA\u9700\u8981\u8fdb\u884c\u4e0a\u62c9\u7535\u963b\u7684\u8fde\u63a5\u3002<\/p>\n \u00a0\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u7531\u4e8eI2C\u63a5\u53e3\u91c7\u7528Open Drain\u673a\u5236\uff0c\u5668\u4ef6\u672c\u8eab\u53ea\u80fd\u8f93\u51fa\u4f4e\u7535\u5e73\uff0c\u65e0\u6cd5\u4e3b\u52a8\u8f93\u51fa\u9ad8\u7535\u5e73\uff0c\u53ea\u80fd\u901a\u8fc7\u5916\u90e8\u4e0a\u62c9\u7535\u963bRP\u5c06\u4fe1\u53f7\u7ebf\u62c9\u81f3\u9ad8\u7535\u5e73\u3002\u56e0\u6b64I2C\u603b\u7ebf\u4e0a\u7684\u4e0a\u62c9\u7535\u963b\u662f\u5fc5\u987b\u7684\uff0c\u5982\u56fe1\u6240\u793a\u3002<\/p>\n \u56fe1<\/p>\n \u56e0\u4e3aI2C\u603b\u7ebf\u5728\u7a7a\u95f2\u65f6\u5fc5\u987b\u62c9\u9ad8\uff0c\u53ea\u6709\u662f\u9ad8\u7684\u624d\u80fd\u62c9\u6210\u4f4e\u7684\uff0c\u6240\u4ee5\u8fd9\u662f\u4e4b\u6240\u4ee5\u89c4\u5b9a\u7a7a\u95f2\u65f6\u5fc5\u987b\u4e3a\u9ad8\u7684\u4e00\u4e2a\u539f\u56e0\uff0c\u8981\u662f\u4fdd\u6301\u201c\u4f4e\u201d\u7684\u8bdd\uff0c\u90a3\u662f\u4e0d\u53ef\u80fd\u6210\u4e3a\u201c\u591a\u4e3b\u201d\u603b\u7ebf\u7684\u3002<\/p>\n \u5176\u5b9eI2C\u603b\u7ebf\u63a5\u53e3\u5728\u5de5\u4f5c\u65f6\u53ea\u4f1a\u68c0\u6d4b<\/u>\u9ad8\u4f4e\u7535\u5e73\uff0c\u4ed6\u4e0d\u4f1a\u5728\u4e4e\u6709\u65e0\u4e0a\u62c9\u7535\u963b\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u603b\u7ebf\u5fc5\u987b\u6ee1\u8db3\u65f6\u5e8f\u8981\u6c42\u3002<\/p>\n \u4e0a\u62c9\u7535\u963b\u7684\u5927\u5c0f\uff0c\u4f1a\u7275\u626f\u5230\u4e24\u4e2a\u95ee\u9898\uff0c\u4e00\u4e2a\u662f\u529f\u8017\uff0c\u4e00\u4e2a\u662f\u901f\u5ea6\u95ee\u9898\uff0c\u4e24\u8005\u662f\u4e00\u4e2a\u77db\u76fe\u4f53\u3002\u5982\u679c\u4f60\u60f3\u5c3d\u91cf\u63d0\u9ad8\u901f\u5ea6\uff0c\u90a3\u4e48\u5c31\u7275\u6d89\u5230\u603b\u7ebf\u7535\u5bb9<\/u>\u7684\u95ee\u9898\uff0c\u5176\u5b9e\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u4e0a\u62c9\u7535\u963b\u4e0e\u603b\u7ebf\u7684\u7535\u5bb9\u5f62\u6210\u4e86RC\uff0c\u9ad8\u901f\u65f6\u5c06\u76f4\u63a5\u5f71\u54cd\u901a\u8baf\uff01\u56e0\u4e3a\u603b\u7ebf\u62c9\u9ad8\u65f6\u6709\u4e2a\u5145\u7535\u65f6\u95f4\u4ee5\u53ca\u9ad8\u7535\u5e73\u7684\u9600\u503c\uff0c\u5982\u679c\u8fd8\u6ca1\u6709\u5145\u7535\u5230\u8db3\u4ee5\u4fdd\u8bc1\u4ece\u5668\u4ef6\u53ef\u4ee5\u8bc6\u522b\u7684\u9ad8\u7535\u5e73\u7684\u9600\u503c\u65f6\u4e3b\u5668\u4ef6\u5c31\u4ee5\u4e3a\u5b8c\u6210\u4e86\u4e00\u4e2a\u603b\u7ebf\u52a8\u4f5c\u7684\u8bdd\uff0c\u90a3\u4e48\u901a\u8baf\u80af\u5b9a\u662f\u4e0d\u80fd\u8fdb\u884c\u7684\uff01 \/\/========================================================<\/p>\n I2C\u4e0a\u62c9\u7535\u963b\u5927\u5c0f<\/strong><\/p>\n I2C\u4e0a\u62c9\u7535\u963b\u786e\u5b9a\u6709\u4e00\u4e2a\u8ba1\u7b97\u516c\u5f0f\uff1a<\/p>\n Rmin\uff1d{Vdd(min)-o.4V}\/3mA<\/p>\n Rmax=(T\/0.874) *c,\u00a0\u00a0 ( T=1us 100KHz, T=0.3us 400KHz )<\/p>\n C\u662fBus capacitance<\/p>\n Rp\u6700\u5927\u503c\u7531\u603b\u7ebf\u6700\u5927\u5bb9\u9650\uff08Cbmax)\u51b3\u5b9a,Rp\u6700\u5c0f\u503c\u7531Vio\u4e0e\u4e0a\u62c9\u9a71\u52a8\u7535\u6d41\uff08\u6700\u5927\u53d63mA)\u51b3\u5b9a\uff1b<\/p>\n \u4e8e\u662f Rpmin=5V\/3mA\u22481.7K(@Vio=5V)\u6216\u80052.8V\/3mA\u22481K(@Vio=2.8V)<\/p>\n Rpmax\u53d6\u503c\uff1a\u6807\u51c6\u6a21\u5f0f\uff0c100Kbps\u603b\u7ebf\u7684\u8d1f\u8f7d\u6700\u5927\u5bb9\u9650<=400pF\uff1b\u5feb\u901f\u6a21\u5f0f\uff0c400Kbps\u603b\u7ebf\u7684\u8d1f\u8f7d\u6700\u5927\u5bb9\u9650<=200pF,\u6839\u636e\u5177\u4f53\u4f7f\u7528\u60c5\u51b5\u3001\u76ee\u524d\u7684\u5668\u4ef6\u5236\u9020\u5de5\u827a\u3001PCB\u7684\u8d70\u7ebf\u8ddd\u79bb\u7b49\u56e0\u7d20\u4ee5\u53ca\u6807\u51c6\u7684\u5411\u4e0b\u517c\u5bb9\u6027\uff0c\u8bbe\u8ba1\u4e2d\u4ee5\u5feb\u901f\u6a21\u5f0f\u4e3a\u57fa\u7840\uff0c\u5373\u603b\u7ebf\u8d1f\u8f7d\u7535\u5bb9<200pF\uff0c\u4e5f\u5c31\u662f\u4f20\u8f93\u901f\u5ea6\u53ef\u4ee5\u4e0a\u5230400Kbps\u662f\u4e0d\u6210\u95ee\u9898\u7684\u3002\u4e8e\u662fRpmax\u53ef\u4ee5\u53d6\u7684\u8303\u56f4\u662f1.8K~7K @ Vio=5V\u5bf9\u5e9450pF~200pF\u3002<\/p>\n \u6839\u636eRpmin\u4e0eRpmax\u7684\u9650\u5236\u8303\u56f4\uff0c\u4e00\u822c\u53d65.1K @ Vio=5V , \u8d1f\u8f7d\u5bb9\u9650\u7684\u73af\u5883\u8981\u6c42\u4e5f\u5bb9\u6613\u8fbe\u5230\u3002\u57282.8V\u7cfb\u7edf\u4e2d\uff0cconsole\u8bbe\u8ba1\u90093.3K,portable\/handset\u7b49\u4f4e\u4f9b\u8017\u7684\u8bbe\u8ba1\u90094.7K\u727a\u7272\u901f\u5ea6\u6362\u53d6\u7535\u6c60\u4f7f\u7528\u65f6\u95f4\u3002<\/p>\n \u603b\u7684\u6765\u8bf4\uff1a\u7535\u6e90<\/u>\u7535\u538b\u9650\u5236\u4e86\u4e0a\u62c9\u7535\u963b\u7684\u6700\u5c0f\u503c \uff1b\u8d1f\u8f7d\u7535\u5bb9\uff08\u603b\u7ebf\u7535\u5bb9\uff09\u9650\u5236\u4e86\u4e0a\u62c9\u7535\u963b\u7684\u6700\u5927\u503c<\/p>\n \u8865\u5145\uff1a\u5728I2c\u603b\u7ebf\u53ef\u4ee5\u4e32\u8fde300\u6b27\u59c6\u7535\u963bRS<\/u>\u53ef\u4ee5\u7528\u4e8e\u9632\u6b62SDA\u548cSCL\u7ebf\u7684\u9ad8\u7535\u538b\u6bdb\u523a\u3002I2C\u534f\u8bae\u8fd8\u5b9a\u4e49\u4e86\u4e32\u8054\u5728SDA\u3001SCL\u7ebf\u4e0a\u7535\u963bRs\u3002\u8be5\u7535\u963b\u7684\u4f5c\u7528\u662f\uff0c\u6709\u6548\u6291\u5236\u603b\u7ebf\u4e0a\u7684\u5e72\u6270\u8109\u51b2\u8fdb\u5165\u4ece\u8bbe\u5907\uff0c\u63d0\u9ad8\u53ef\u9760\u6027\u3002\u8fd9\u4e2a\u7535\u963b\u7684\u9009\u62e9\u4e00\u822c\u5728100\uff5e200ohm\u5de6\u53f3\u3002\u5f53\u7136,\u8fd9\u4e2a\u7535\u963b\u5e76\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u5728\u6076\u52a3\u566a\u58f0\u73af\u5883\u4e2d\uff0c\u53ef\u4ee5\u9009\u7528\u3002<\/p>\n \/\/========================================================<\/p>\n I2C\u4e0a\u62c9\u7535\u963b\u8ba8\u8bba<\/strong><\/p>\n RP\u4e0d\u5b9c\u8fc7\u5c0f\uff0c\u4e00\u822c\u4e0d\u4f4e\u4e8e1K\u03a9<\/p>\n \u4e00\u822cIO \u7aef\u53e3\u7684\u9a71\u52a8\u80fd\u529b\u57282mA\uff5e4mA\u91cf\u7ea7\u3002\u5982\u679cRP\u963b\u503c\u8fc7\u5c0f\uff0cVDD\u704c\u5165\u7aef\u53e3\u7684\u7535\u6d41\u5c06\u8f83\u5927\uff0c\u8fd9\u5bfc\u81f4\u7aef\u53e3\u8f93\u51fa\u7684\u4f4e\u7535\u5e73\u503c\u589e\u5927(I2C\u534f\u8bae\u89c4\u5b9a\uff0c\u7aef\u53e3\u8f93\u51fa\u4f4e\u7535\u5e73\u7684\u6700\u9ad8\u5141\u8bb8\u503c\u4e3a0.4V)\uff1b\u5982\u679c\u704c\u5165\u7aef\u53e3\u7684\u7535\u6d41\u8fc7\u5927\uff0c\u8fd8\u53ef\u80fd\u635f\u574f\u7aef\u53e3\u3002\u6545\u901a\u5e38\u4e0a\u62c9\u7535\u963b\u5e94\u9009\u53d6\u4e0d\u4f4e\u4e8e1K\u03a9\u7684\u7535\u963b\uff08\u5f53VDD\uff1d3V\u65f6\uff0c\u704c\u5165\u7535\u6d41\u4e0d\u8d85\u8fc73mA\uff09\u3002<\/p>\n RP\u4e0d\u5b9c\u8fc7\u5927\uff0c\u4e00\u822c\u4e0d\u9ad8\u4e8e10K\u03a9<\/p>\n \u7531\u4e8e\u7aef\u53e3\u8f93\u51fa\u9ad8\u7535\u5e73\u662f\u901a\u8fc7RP\u5b9e\u73b0\u7684\uff0c\u7ebf\u4e0a\u7535\u5e73\u4ece\u4f4e\u5230\u9ad8\u53d8\u5316\u65f6\uff0c\u7535\u6e90\u901a\u8fc7RP\u5bf9\u7ebf\u4e0a\u8d1f\u8f7d\u7535\u5bb9CL\u5145\u7535\uff0c\u8fd9\u9700\u8981\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u5373\u4e0a\u5347\u65f6\u95f4\u3002\u7aef\u53e3\u4fe1\u53f7\u7684\u4e0a\u5347\u65f6\u95f4\u53ef\u8fd1\u4f3c\u7528\u5145\u7535\u65f6\u95f4\u5e38\u6570RPCL\u4e58\u79ef\u8868\u793a\u3002<\/p>\n \u4fe1\u53f7\u7ebf\u8d1f\u8f7d\u7535\u5bb9\uff08\u5bf9\u5730\uff09\u7531\u591a\u65b9\u9762\u7ec4\u6210\uff0c\u5305\u62ec\u5668\u4ef6\u5f15\u811a\u3001PCB\u4fe1\u53f7\u7ebf\u3001\u8fde\u63a5\u5668\u7b49\u3002\u5982\u679c\u4fe1\u53f7\u7ebf\u4e0a\u6302\u6709\u591a\u4e2a\u5668\u4ef6\uff0c\u8d1f\u8f7d\u7535\u5bb9\u4e5f\u4f1a\u589e\u5927\u3002\u6bd4\u5982\u603b\u7ebf\u89c4\u5b9a\uff0c\u5bf9\u4e8e\u7684400kbps\u901f\u7387\u5e94\u7528\uff0c\u4fe1\u53f7\u4e0a\u5347\u65f6\u95f4\u5e94\u5c0f\u4e8e300ns\uff1b\u5047\u8bbe\u7ebf\u4e0aCL\u4e3a20PF\uff0c\u53ef\u8ba1\u7b97\u51fa\u5bf9\u5e94\u7684RP\u503c\u4e3a15K\u03a9\u3002<\/p>\n \u5982\u679cRC\u5145\u7535\u65f6\u95f4\u5e38\u6570\u8fc7\u5927\uff0c\u5c06\u4f7f\u5f97\u4fe1\u53f7\u4e0a\u5347\u6cbf\u53d8\u5316\u7f13\u6162\uff0c\u8fbe\u4e0d\u5230\u6570\u636e\u4f20\u8f93\u7684\u8981\u6c42\u3002<\/p>\n 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