{"id":2788,"date":"2019-09-03T02:49:06","date_gmt":"2019-09-03T02:49:06","guid":{"rendered":""},"modified":"2019-09-03T10:49:27","modified_gmt":"2019-09-03T02:49:27","slug":"%e5%9f%ba%e4%ba%8emax7348%e7%9a%84%e4%b8%b2%e8%a1%8ci2c%e6%80%bb%e7%ba%bf%e7%9a%84%e9%94%ae%e7%9b%98%e7%94%b5%e8%b7%af%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2788","title":{"rendered":"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1"},"content":{"rendered":"

\n\t\u4e00\u3001\u6982\u8ff0<\/p>\n

\n\t\u672c\u6587\u4ecb\u7ecd\u4e00\u79cd\u91c7\u7528MAX7348\u7684\u4e32\u884cI2C<\/u>\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def<\/u>\u4ee5\u53ca\u9a71\u52a8\u7a0b\u5e8f\u7684\u8bbe\u8ba1\u3002<\/p>\n

\n\t <\/div>\n

\n\tI2C \u9700\u8981\u8fde\u7ebf\u5c11\uff0c\u4ec5\u9700\u4e00\u6761\u4e32\u884c\u65f6\u949f<\/u>\u7ebf\u548c\u4e00\u6761\u4e32\u884c\u6570\u636e\u7ebf\u3002\u5141\u8bb8\u591a\u4e3b\u673a\u63a7\u5236\uff0c\u5177\u6709\u88c1\u51b3\u548c\u540c\u6b65\u529f\u80fd\uff0c\u53ef\u968f\u610f\u6dfb\u52a0\u6216\u6458\u9664\u603b\u7ebf\u4e0a\u7684\u5b50\u5668\u4ef6\u7b49\u8bf8\u591a\u4f18\u70b9\uff0c\u6240\u4ee5\u5df2\u7ecf\u88ab\u5e7f\u6cdb\u5e94\u7528\u3002<\/p>\n

\n\t\u4e8c\u3001MAX7348<\/p>\n

\n\tMAX7348 \u662f\u7f8e\u56fdMAXIM \u516c\u53f8\u751f\u4ea7\u76842 \u7ebf\u63a5\u53e3<\/u>\u3001\u4f4eEMI<\/u> \u952e\u76d8\u5f00\u5173<\/u>\u548c\u53d1\u58f0\u63a7\u5236\u5668\uff0c\u53ef\u76d1\u63a7<\/u>\u591a\u8fbe40 \u4e2a\u6309\u952e\uff0c\u53ef\u5bf9\u6309\u952e\u53bb\u6296\u5e76\u4fdd\u5b58\u5728FIF<\/u>O \u4e2d\uff0c\u53bb\u6296\u65f6\u95f4\u7528\u6237\u53ef\u57289 ~ 40ms \u4e4b\u95f4\u4efb\u610f\u8bbe\u7f6e\uff0cMAX7348 \u81ea\u5e26\u7684\u97f3\u8c03\u53d1\u751f\u5668\u5728\u63a7\u5236\u5668\u7684\u4f5c\u7528\u4e0b\u53ef\u81ea\u52a8\u53d1\u51fa\u6309\u952e\u58f0\u548c\u62a5\u8b66\u58f0\uff0c\u5728\u53d1\u58f0\u671f\u95f4\uff0c\u8f93\u51fa\u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u9ad8\u7535\u5e73\u6216\u4f4e\u7535\u5e73\uff0c\u4ee5\u9a71\u52a8\u7535\u5b50\u53d1\u58f0\u5668\u3001\u7ee7\u7535\u5668<\/u>\u6216\u6307\u793a\u706f<\/u>\u3002<\/p>\n

\n\t\u82af\u7247\u91c7\u7528400Kps\uff0c5.5V \u5bb9\u96502 \u7ebf\u4e32\u884c\u63a5\u53e3\uff0c\u5de5\u4f5c\u7535\u538b2.4 ~ 3.6V\uff0c4 \u4e2aI2C \u5730\u5740\u9009\u62e9\u3002\u4e0eMAX7348\u540c\u7cfb\u5217\u7684\u8fd8\u6709MAX7347 \u548cMAX7349 \u7b49\u3002<\/p>\n

\n\t\u5982\u56fe1 \u6240\u793a\uff0cSDA \u3001SCL \u5206\u522b\u662f\u517c\u5bb9I2C \u4e32\u884c\u603b\u7ebf\u7684\u6570\u636e\u3001\u65f6\u949f\u63a5\u53e3\uff0c\u4f7f\u7528\u65f6\u901a\u5e38\u9700\u8981\u63a5\u4e00\u4e2a\u5178\u578b\u503c\u4e3a4.7kΩ \u7684\u4e0a\u62c9\u7535\u963b<\/u>\uff1bROW0 ~ ROW8 \u4e3a\u952e\u76d8\u77e9\u9635\u884c\u8f93\u5165\u7aef\u53e3\uff0c\u4e0d\u7528\u65f6\u5f00\u8def<\/u>\uff1bCOL0 ~ COL4\u4e3a\u952e\u76d8\u77e9\u9635\u5217\u8f93\u51fa\u7aef\u53e3\uff1bSOUNDER \u4e3a\u53d1\u58f0\u5668\u8f93\u51fa\u7aef\u53e3\uff0c\u8be5\u8f93\u51fa\u4e3a\u63a8\u633d\u7ed3\u6784\uff0c\u901a\u5e38\u4e0e\u5730\u4e4b\u95f4\u63a5\u4e00\u4e2a\u538b\u7535\u9676\u74f7\u7247\u6216\u5176\u4ed6\u53d1\u58f0\u8bbe\u5907\uff1bINT \u4e3a\u4e2d\u65ad\u8f93\u51fa\u7aef\u53e3\uff1bADO \u4e3a\u5730\u5740\u8f93\u5165\u7aef\u53e3\uff0c\u7528\u6765\u8bbe\u7f6e\u5668\u4ef6\u7684\u4ece\u5730\u5740\uff0c\u8be5\u5f15\u811a\u63a5GND\u3001V+\u3001SDA\u3001SCL \u53ef\u5f62\u62104 \u79cd\u903b\u8f91\u7ec4\u5408\u6784\u6210MAX7348 \u76844 \u4e2a\u53ef\u9009\u7684I2C \u5730\u5740\uff0c\u5982\u88681 \uff1bGND \u4e3a\u63a5\u5730\u7aef\uff0cV+ \u63a5\u7535\u6e90\uff082.4 ~ 3.6V\uff09\u3002<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\t\u88681 2\u7ebf\u63a5\u53e3\u5730\u5740\u5206\u914d\u8868<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\tD0 ~ D5 \u4f4d\u8868\u793a\u6309\u952e\u4e2d\u7684\u90a3\u4e9b\u952e\u5df2\u53bb\u6296\uff0cD6 \u6307\u660e\u5f53\u524d\u53bb\u6296\u6309\u952e\u662f\u5426\u662fFIFO \u4e2d\u7684\u6700\u540e\u4e00\u4e2a\uff1bD7 \u4f4d\u662f\u6ea2\u51fa\u6807\u5fd7\uff0c\u5b83\u8868\u793a\u6309\u952eFIFO \u662f\u5426\u6ea2\u51fa\u3002\u8bfb\u6309\u952e\u626b\u63cfFIFO \u5c06\u6e05\u9664\u4e2d\u65ad\u4fe1\u53f7\uff0c\u4f46\u662f\u53ea\u6709\u901a\u8fc7\u6267\u884c\u8db3\u591f\u6b21\u6570\u7684\u8bfb\u64cd\u4f5c\u6e05\u7a7aFIFO\u540e\u624d\u80fd\u518d\u6b21\u4ea7\u751f\u4e2d\u65ad\uff08INT\uff09\u4fe1\u53f7\u3002<\/p>\n

\n\t\uff082\uff09\u53bb\u6296\u5bc4\u5b58\u5668<\/u>\uff08 01H\uff09 \u8be5\u5bc4\u5b58\u5668\u7528\u6765\u8bbe\u7f6e\u6bcf\u4e00\u4e2a\u53bb\u6296\u5468\u671f\u7684\u65f6\u95f4\uff0c\u4ee5\u53ca\u4f7f\u80fd\u548c\u7981\u7528GPO \u7aef\u53e3\uff0c\u5176\u4e2dD0 ~ D4 \u4f4d\u7528\u6765\u57289 ~ 40ms \u8303\u56f4\u5185\u8bbe\u7f6e\u53bb\u6296\u65f6\u95f4\uff0c\u6b65\u957f1ms\uff0cD5 ~ D7 \u7528\u6765\u8bbe\u7f6e\u4f7f\u80fd\u90a3\u4e00\u4e2aGPO \u7aef\u53e3\uff08\u88682\uff09\u3002<\/p>\n

\n\t\u88682 \u53bb\u6296\u5bc4\u5b58\u5668\u8bbe\u7f6e<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\t\uff083\uff09\u81ea\u52a8\u91cd\u590d\u5bc4\u5b58\u5668\uff08 02H\uff09\u8be5\u5bc4\u5b58\u5668\u7528\u6765\u8bbe\u7f6e\u81ea\u52a8\u91cd\u590d\u9891\u7387\u53ca\u5176\u5ef6\u65f6\u3002\u5f53\u6309\u952e\u6309\u4e0b\u4e14\u6ca1\u6709\u91ca\u653e\u65f6\uff0c\u81ea\u52a8\u91cd\u590d\u529f\u80fd\u5141\u8bb8\u8fde\u7eed\u89e6\u53d1\u6309\u952e\u4e8b\u4ef6\u3002\u81ea\u52a8\u91cd\u590d\u5ef6\u65f6\u89c4\u5b9a\u4e86\u7b2c\u4e00\u6b21\u6309\u4e0b\u6309\u952e\u4e0e\u5f00\u59cb\u91cd\u590d\u4e4b\u95f4\u7684\u65f6\u95f4\uff08\u5982\u679c\u6309\u952e\u6ca1\u6709\u91ca\u653e\uff09\u3002\u81ea\u52a8\u91cd\u590d\u9891\u7387\u89c4\u5b9a\u4e86\u81ea\u52a8\u91cd\u590d\u5f00\u59cb\u540e\u6309\u952e\u4e8b\u4ef6\u8fde\u7eed\u89e6\u53d1\u7684\u901f\u5ea6\u3002D0 ~ D3\u8bbe\u5b9a\u81ea\u52a8\u91cd\u590d\u5ef6\u65f6\uff0c\u8303\u56f4\u4ece8 \u4e2a\u53bb\u6296\u5468\u671f\u5230128 \u4e2a\u53bb\u6296\u5468\u671f\u3002D4 ~ D6 \u4f4d\u89c4\u5b9a\u91cd\u590d\u9891\u7387\uff0c\u8303\u56f4\u662f4 \u523032 \u4e2a\u53bb\u6296\u5468\u671f\uff0cD7 \u4f4d\u662f\u81ea\u52a8\u91cd\u590d\u529f\u80fd\u4f7f\u80fd\u4f4d\uff08\u5982\u88683 \u6240\u793a\uff09\u3002<\/p>\n

\n\t\u88683 \u81ea\u52a8\u91cd\u590d\u5bc4\u5b58\u5668<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\t\uff084\uff09 \u4e2d\u65ad\u5bc4\u5b58\u5668\uff08 03H\uff09 \u8be5\u5bc4\u5b58\u5668\u5305\u542b\u4e0e\u4e2d\u65ad\u8bf7\u6c42\u529f\u80fd\u8bbe\u7f6e\u6709\u5173\u7684\u4fe1\u606f\uff0c\u4ee5\u53caINT \u8f93\u51fa\u7684\u72b6\u6001\uff0cINT \u8f93\u51fa\u4e5f\u53ef\u914d\u7f6e\u4e3aGPO.\u4e2d\u65ad\u5bc4\u5b58\u5668\u662f\u53ea\u8bfb\u5bc4\u5b58\u5668\uff0c\u5411\u8be5\u5bc4\u5b58\u5668\u5199\u5165\u6570\u636e\u65e0\u6548\u3002<\/p>\n

\n\t\uff085\uff09\u914d\u7f6e\u5bc4\u5b58\u5668\uff0804H\uff09\u8be5\u5bc4\u5b58\u5668\u53cd\u6620\u53d1\u58f0\u5668\u7684\u72b6\u6001\u3001\u63a7\u5236I2C \u603b\u7ebf\u8d85\u65f6\u3001\u4f7f\u80fd\u62a5\u8b66\u8f93\u5165\u4e2d\u65ad\u3001\u4f7f\u80fd\u53d1\u58f0\u5668\u5bf9\u62a5\u8b66\u8f93\u5165\u548c\u6309\u952e\u53bb\u6296\u65f6\u95f4\u505a\u51fa\u54cd\u5e94\uff0c\u4ee5\u53ca\u63a7\u5236\u5668\u4ef6\u5173\u65ad\u7b49\u3002\u8be5\u5bc4\u5b58\u5668\u7ed3\u6784\u5982\u88684 \u6240\u793a\uff0c\u9664D1\u3001D2 \u8bbe\u5b9a\u53d1\u58f0\u5668\u8f93\u51fa\u72b6\u6001\u5916\uff0c\u5176\u4f59\u6bcf\u4e00\u4f4d\u5bf9\u5e94\u4e00\u4e2a\u63a7\u5236\u72b6\u6001\uff0c\u7528\u6237\u53ef\u6839\u636e\u9700\u8981\u4f7f\u80fd\uff08\u7f6e"1"\uff09\u6216\u7981\u6b62\uff08\u7f6e"0"\uff09\u3002<\/p>\n

\n\t\u88684 \u914d\u7f6e\u5bc4\u5b58\u5668\u7ed3\u6784<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\t\uff086\uff09\u6309\u952e\u53d1\u58f0\u5bc4\u5b58\u5668\uff08 06H\uff09 \u5982\u679c\u914d\u7f6e\u5bc4\u5b58\u5668\uff0804H\uff09\u4e2d\u4f7f\u80fd\u6309\u952e\u53d1\u58f0\uff0c\u90a3\u4e48\u5f53\u4e00\u4e2a\u952e\u6216\u4e00\u7ec4\u952e\u53bb\u6296\u540e\uff0c\u53d1\u58f0\u63a7\u5236\u5668\u5c06\u53d1\u51fa\u58f0\u97f3\uff0c\u5e76\u7531\u6309\u952e\u53d1\u58f0\u5bc4\u5b58\u5668\u8bbe\u5b9a\u53d1\u58f0\u7684\u65f6\u95f4\u548c\u9891\u7387\u3002<\/p>\n

\n\t\u9664\u4ee5\u4e0a\u51e0\u4e2a\u4e3b\u8981\u5bc4\u5b58\u5668\u5916\u8fd8\u6709\u7aef\u53e3\u5bc4\u5b58\u5668\u3001\u62a5\u8b66\u58f0\u5bc4\u5b58\u5668\u3001\u53d1\u58f0\u5668\u5bc4\u5b58\u5668\u7b49\u591a\u4e2a\u5bc4\u5b58\u5668\uff0c\u8fd9\u4e9b\u5bc4\u5b58\u5668\u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u53d1\u58f0\u5668\u548c\u6269\u5c55GPO \u7aef\u53e3\uff0c\u5728\u6b64\u4e0d\u505a\u8be6\u7ec6\u53d9\u8ff0\uff0c\u611f\u5174\u8da3\u7684\u8bfb\u8005\u53ef\u4ee5\u81ea\u884c\u67e5\u9605\u6709\u5173MAX7348 \u7684\u6280\u672f\u8d44\u6599\u3002<\/p>\n

\n\t\u4e09\u3001\u7535\u8def\u8bbe\u8ba1<\/p>\n

\n\t\u56fe2 \u662f\u7b14\u8005\u8bbe\u8ba1\u7684MAX7348 \u5e94\u7528\u7535\u8def\uff0c\u8be5\u7535\u8def\u4ee5\u51cc\u9633\uff08SPCE061A\uff09\u5355\u7247\u673a<\/u>\u4e3a\u4e3b\u63a7\u5236\u5668\uff0c\u7ed3\u5408MAX7348 \u6784\u6210\u4e86\u4e00\u4e2a\u5177\u670940 \u4e2a\u6309\u952e\u7684\u952e\u76d8\u7535\u8def\uff0c\u901a\u8fc7\u7a0b\u5e8f\u53ef\u4ee5\u8bbe\u7f6e\u6309\u952e\u53d1\u58f0\u3001\u81ea\u52a8\u8fde\u7eed\u6309\u952e\u3001\u4e2d\u65ad\u8f93\u51fa\u7b49\u529f\u80fd\u3002MAX7348 \u7684SDA\u3001SCL\u3001INT \u5206\u522b\u4e0eSPCE061A \u5355\u7247\u673a\u7684IOB0\u3001IOB1\u3001IOB2\uff08\u6ce8\uff1aSPCE061A \u5355\u7247\u673a\u7684IOB2 \u4e3a\u5916\u90e8\u4e2d\u65ad1 \u7684\u8f93\u5165\u53e3\uff09\u8fde\u63a5\uff0c\u7531\u4e8eI2C \u603b\u7ebf\u5141\u8bb8\u6302\u63a5\u591a\u4e2a\u4ece\u673a\uff0c\u6240\u4ee5\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u53ef\u4ee5\u5c06\u591a\u4e2a\u4e0d\u540c\u4ece\u673a\u5730\u5740\u7684\u8bbe\u5907\u6302\u63a5\u5728\u540c\u4e00\u603b\u7ebf\u4e0a\uff0c\u4e3a\u5355\u7247\u673a\u8282\u7ea6\u5927\u91cf\u7684\u786c\u4ef6\u8d44\u6e90\u3002<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

\n\t\u56db\u3001\u8f6f\u4ef6\u7f16\u5199<\/p>\n

\n\t\u5728\u56fe2 \u6240\u793a\u7684\u952e\u76d8\u7535\u8def\u4e2d\uff0c\u7531\u4e8eMAX7348 \u53ea\u5177\u6709\u517c\u5bb9\u7684I2C \u63a5\u53e3\uff0c\u800cSPCE061A \u5355\u7247\u673a\u672c\u8eab\u4e0d\u5177\u5907I2C\u63a5\u53e3\uff0c\u8981\u5b9e\u73b0\u4e8c\u8005\u4e4b\u95f4\u7684\u6570\u636e\u4f20\u8f93\uff0c\u901a\u5e38\u91c7\u7528\u901a\u7528IO\u53e3\u8f6f\u4ef6\u6a21\u62dfI2C \u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002\u56fe3 \u662fMAX7348 \u7684\u603b\u7ebf\u65f6\u5e8f\u3002<\/p>\n

\n\t\"\u57fa\u4e8eMAX7348\u7684\u4e32\u884cI2C\u603b\u7ebf\u7684\u952e\u76d8\u7535\u8def\u8bbe\u8ba1\"<\/p>\n

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