{"id":2943,"date":"2020-01-02T09:25:59","date_gmt":"2020-01-02T09:25:59","guid":{"rendered":""},"modified":"2020-01-02T17:26:18","modified_gmt":"2020-01-02T09:26:18","slug":"pic%e5%8d%95%e7%89%87%e6%9c%ba%e9%a9%b1%e5%8a%a8lcd%e6%a8%a1%e5%9d%97%e7%9a%84%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2943","title":{"rendered":"PIC\u5355\u7247\u673a\u9a71\u52a8LCD\u6a21\u5757\u7684\u8bbe\u8ba1"},"content":{"rendered":"
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\n\t\u5982\u4f55\u6700\u5927\u7a0b\u5ea6\u589e\u5927\u7535\u963b\uff0c\u800c\u53c8\u4e0d\u4f1a\u5bf9\u663e\u793a\u8d28\u91cf\u4ea7\u751f\u8d1f\u9762\u5f71\u54cd\uff1f\u4e00\u4e9b\u57fa\u672c\u7684\u7535\u8def\u5206\u6790\u53ef\u4ee5\u5e2e\u52a9\u786e\u5b9a\u68af\u5f62\u7f51\u7edc\u4e2d\u7535\u963b\u589e\u5927\u7684\u7a0b\u5ea6\u3002<\/p>\n
\n\tLCD\u6a21\u5757\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2a\u6a21\u62df\u591a\u8def\u5f00\u5173<\/u>\uff0c\u5b83\u4ea4\u66ff\u5730\u5c06LCD\u7535\u538b\u8fde\u63a5\u5230\u5404\u4e2a\u6bb5\u548c\u516c\u5171\u5f15\u811a\uff08\u6bb5\u7535\u6781\u548c\u516c\u5171\u7535\u6781\u4ea4\u53c9\u4e8e\u6bcf\u4e00\u4e2aLCD\u50cf\u7d20\u70b9\uff09\u3002LCD\u50cf\u7d20\u53ef\u7528\u7535\u5bb9<\/u>\u8fdb\u884c\u6a21\u62df\u3002\u68af\u5f62\u7535\u963b\u7f51\u7edc\u4e2d\u7684\u6bcf\u4e2a\u5206\u63a5\u70b9\u53ef\u4ee5\u7528\u6234\u7ef4\u5357\uff08Thevenin\uff09\u7b49\u6548\u7535\u8def\u8fdb\u884c\u6a21\u62df\u3002\u5bf9\u4e8eVLCD3\u548cVLCD0\uff0c\u6234\u7ef4\u5357\u7535\u963b\u4e3a0\uff1b\u5982\u5b83\u4e0d\u4e3a0\u7684\u4e24\u79cd\u60c5\u51b5\uff0c\u5373\u5bf9\u4e8eVLCD2\u548cVLCD1\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u7535\u8def\u53ef\u4ee5\u7b80\u5316\u4e3a\u5982\u4e0b\u56fe\u6240\u793a\u7684\u7535\u8def\u3002<\/p>\n
\n\t<\/p>\n
\n\tRS<\/u>W\u662f\u6bb5\u591a\u8def\u5f00\u5173\u7684\u7535\u963b\uff1bRCOM\u662f\u516c\u5171\u591a\u8def\u5f00\u5173\u7684\u7535\u963b\u3002<\/p>\n
\n\t\u5bf9\u4e8e\u6234\u7ef4\u5357\u7535\u963b\u4e0d\u4e3a0\u7684\u60c5\u51b5\uff0c\u6234\u7ef4\u5357\u7535\u538b\u7b49\u4e8e2\/3 VDD\u62161\/3 VDD\u3002\u6234\u7ef4\u5357\u7535\u963b\u7b49\u4e8e\u68af\u5f62\u7535\u963b\u7f51\u7edc\u4e0a\u90e8\u548c\u4e0b\u90e8\u7684\u4e32\u8054\u7535\u963b\uff0c\u5176\u4f30\u7b97\u7535\u963b\u7684\u7b49\u6548\u7535\u8def\u89c1\u53f3\u56fe\u6240\u793a\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u4f8b\u5982\uff0e\u53ef\u4ee5\u7528RC\u7535\u8def\u6765\u6a21\u62df\u5355\u4e2a\u50cf\u7d20\u7684\u9a71\u52a8\u5668\uff0c\u5728\u8be5\u7535\u8def\u4e2d\u7535\u538b\u57280V\uff5eVLCD2\u4e4b\u95f4\u5207\u6362\u3002\u5bf9\u4e8eLCD\u548cPI<\/u>C\u5355\u7247\u673a<\/u>\uff0c\u53ef\u4ee5\u4f30\u7b97\u6bb5\u548c\u516c\u5171\u5f00\u5173\u7535\u8def\u7684\u7535\u963b\u5206\u522b\u5927\u7ea6\u4e3a4.7kΩ\u548c0.4kΩ\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u7ecf\u8fc7\u50cf\u7d20\u7684\u7535\u538b\u4ece0\u53d8\u4e3aVTH\u7684\u65f6\u95f4\u5c06\u53d6\u51b3\u4e8e\u50cf\u7d20\u7684\u7535\u5bb9\u548c\u603b\u7535\u963b\uff0c\u800c\u68af\u5f62\u7535\u963b\u7f51\u7edc\u6234\u7ef4\u5357\u7535\u963b\u6784\u6210\u4e86\u603b\u7535\u963b\u6700\u4e3b\u8981\u7684\u90e8\u5206\u3002<\/p>\n
\n\t\u7ecf\u8fc7\u50cf\u7d20\uff08\u7b49\u6548\u7535\u8def\u89c1\u4e0b\u56fe\u6240\u793a\uff09\u7684\u7535\u538b\u7684\u9636\u8dc3\u54cd\u5e94\u9075\u5faa\u4ee5\u4e0b\u516c\u5f0f\uff1a<\/p>\n
\n\t<\/p>\n
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\n\t<\/p>\n
\n\t\u73b0\u5728\uff0c\u9700\u8981\u4f30\u7b97\u7535\u5bb9\u3002\u7535\u5bb9\u5927\u5c0f\u6b63\u6bd4\u4e8e\u50cf\u7d20\u7684\u9762\u79ef\u3002\u6211\u4eec\u53ef\u4ee5\u6d4b\u91cf<\/u>\u50cf\u7d20\u7684\u9762\u79ef\uff0c\u5e76\u6839\u636e\u4ee5\u4e0b\u516c\u5f0f\u4f30\u7b97\u7535\u5bb9\u3002\u5f88\u663e\u7136\uff0c\u8f83\u5927\u7684\u663e\u793a\u5668<\/u>\uff08\u5982\u6570\u5b57\u5899\u949f\uff09\u5c06\u5177\u6709\u8f83\u5927\u7684\u50cf\u7d20\u548c\u8f83\u9ad8\u7684\u7535\u5bb9\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u5e0c\u671b\u65f6\u95f4\u5e38\u6570\u8fdc\u5c0f\u4e8eLCD\u9a71\u52a8\u6ce2\u5f62\u7684\u5468\u671f\uff0c\u4ee5\u4fbf\u6700\u5927\u7a0b\u5ea6\u5730\u51cf\u5c11\u5728VPIXEL\u4e0a\u5347\u5230VTH\u7684\u65f6\u95f4\u6bb5\u5185\u51fa\u73b0\u4e00\u4e2a\u4ee5\u4e0a\u7684LCD\u9a71\u52a8\u6ce2\u5f62\u7684\u53ef\u80fd\u6027\u3002\u5982\u679c\u5e0c\u671bRC\u7b49\u4e8e100μs\uff0c\u90a3\u4e48\u603b\u7535\u963b\u53ef\u4ee5\u6839\u636e\u4ee5\u4e0b\u516c\u5f0f\u8ba1\u7b97\uff1a<\/p>\n
\n\t<\/p>\n
\n\tRTOTAL=l00μs\/45pF=2.22MΩ<\/p>\n
\n\tRTH=2.22MΩ-5.1kΩ≈2.2MΩ<\/p>\n
\n\tLCD\u6a21\u5757\u5185\u7684\u5f00\u5173\u7535\u8def\u7535\u963b\u76f8\u5bf9\u4e8e\u8be5\u7535\u963b\u6765\u8bf4\u5f88\u5c0f\uff0c\u6240\u4ee5\u68af\u5f62\u7535\u963b\u7f51\u7edc\u5728VLCD2\u548cVLCD1\u65f6\u7684\u6234\u7ef4\u5357\u7535\u963b\u53ef\u4ee5\u89c6\u4e3a\u5c31\u662fRTOTAL\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u8ba1\u7b97R\u7684\u503c\uff0c\u4ece\u800c\u5f97\u5230\u6b63\u786e\u7684\u6234\u7ef4\u5357\u7535\u963b\u3002<\/p>\n
\n\tR=3RTH\/2=3.3MΩ<\/p>\n
\n\t\u73b0\u5728\uff0e\u53ef\u4ee5\u8ba1\u7b97\u901a\u8fc7\u68af\u5f62\u7535\u963b\u7f51\u7edc\u7684\u7535\u6d41\uff08\u5047\u8bbe\u4f7f\u75283.3MΩ\u7684\u7535\u963b\uff09\u3002<\/p>\n
\n\tRLADDER=9.9MΩ\uff0cILADDER=5V\/9.9M=0.5μA<\/p>\n
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