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\u7535\u8def\u4e8c\uff1a<\/p>\n\n\n\n

\"img\"\/<\/div><\/figure>\n\n\n\n

\u901f\u7387\u9ad8\u65f6\u7ed9\u57fa\u6781\u52a0\u52a0\u901f\u7535\u5bb9<\/p>\n\n\n\n

\u5de5\u4f5c\u539f\u7406\uff1a<\/p>\n\n\n\n

\u5f53\u8f93\u5165 S_IN \u4e3a\u4f4e\u7535\u5e73\u65f6\uff0c\u4e09\u6781\u7ba1 Q1\u5173\u65ad\uff0c\u4e09\u6781\u7ba1 Q2 \u57fa\u6781\u4e3a\u9ad8\u7535\u5e73\uff0c\u5bfc\u81f4 Q2 \u5bfc\u901a\uff0c\u8f93\u51fa\u7aef S_OUT\u88ab\u62c9\u4f4e\uff0c\u5b9e\u73b0\u4e24\u7aef\u90fd\u4e3a\u4f4e\u7535\u5e73\u3002<\/p>\n\n\n\n

\u5f53\u8f93\u5165 S_IN \u4e3a\u9ad8\u7535\u5e73 (VDD_EXT) \u65f6\uff0c\u4e09\u6781\u7ba1 Q1 \u5bfc\u901a\uff0c\u4e09\u6781\u7ba1Q2\u5173\u65ad\uff0c\u8f93\u51fa\u7aef S_OUT \u88ab R4 \u62c9\u9ad8\u5230 VDD_MCU\uff0c\u5b9e\u73b0\u4e24\u7aef\u90fd\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u4f18\u70b9\uff1a\uff081\uff09\u4fbf\u5b9c\uff1a\u4e09\u6781\u7ba1\u5e38\u89c1\u5e76\u4e14\u5bb9\u6613\u91c7\u8d2d\uff0c\u4ef7\u683c\u4f4e\u5ec9\u3002<\/p>\n\n\n\n

\uff082\uff09\u9a71\u52a8\u80fd\u529b\u5f3a\uff1a\u9a71\u52a8\u80fd\u529b\u53d6\u51b3\u4e8e\u4e09\u6781\u7ba1\uff0c\u53ef\u4ee5\u505a\u5230\u6570\u5341mA\uff1b<\/p>\n\n\n\n

\uff083\uff09\u6f0f\u7535\u6d41\u4f4e\uff1aIN \u548cOUT\u4e24\u8005\u4e4b\u95f4\u7684\u6f0f\u7535\u6d41\u8f83\u5c0f(uA\u7ea7\u522b)\uff0c\u51e0\u4e4e\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u3002<\/p>\n\n\n\n

\u7f3a\u70b9\uff1a\uff081\uff09\u901f\u5ea6\uff1a\u4e24\u7ea7\u4e09\u6781\u7ba1\u5c5e\u4e8e\u7535\u6d41\u9a71\u52a8\u578b\uff0c\u52a0\u4e0a\u7535\u8def\u548c\u5bc4\u751f\u7535\u5bb9\uff0c\u8f6c\u6362\u540e\u7684\u6ce2\u5f62\u4e0d\u662f\u5341\u5206\u7406\u60f3\u3002\u4e00\u822c\u53ea\u80fd\u7528\u4e8e100K\u4ee5\u5185\u7684\u4fe1\u53f7\u8f6c\u6362\u3002<\/p>\n\n\n\n

\uff082\uff09\u5668\u4ef6\u591a\uff1a\u540c\u76f8\u8f6c\u6362\u9700\u89812\u4e2a\u4e09\u6781\u7ba1\u4ee5\u53ca\u914d\u5957\u7684\u7535\u963b\uff0c\u591a\u8def\u8f6c\u6362\u65f6\u5360\u7528\u7a7a\u95f4\u8f83\u591a\u3002<\/p>\n\n\n\n

5\uff0e<\/strong>MOS\u7ba1\u6784\u6210\u7684\u53cc\u5411\u7535\u5e73\u8f6c\u6362\u7535\u8def<\/em><\/h3>\n\n\n\n
\"img\"\/<\/div><\/figure>\n\n\n\n

\u5de5\u4f5c\u539f\u7406\uff1a<\/p>\n\n\n\n

\u4ece\u5de6\u5411\u53f3\u770b<\/p>\n\n\n\n

\u5f53 S1A \u4e3a\u9ad8\u7535\u5e73 (VCC_S1) \u65f6\u5019\uff0cMOS\u7ba1 VGS = 0\uff0c NM1 \u4e0d\u5bfc\u901a\uff0cS2A \u5904\u7535\u5e73\u88ab R11 \u4e0a\u62c9\u4e3a\u9ad8\u7535\u5e73(VCC_S2)\uff0cS2A\u4e5f\u4e3a\u9ad8\u7535\u5e73\u3002\u4e24\u7aef\u90fd\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u5f53 S1A \u4e3a\u4f4e\u7535\u5e73 \u65f6\u5019\uff0cMOS\u7ba1 VGS = VCC_S1\uff0c NM1 \u5bfc\u901a\uff0cS2A \u7684\u7535\u5e73\u4e0e S1A\u76f8\u7b49\uff0c\u4e3a\u4f4e\u7535\u5e73\u3002\u4e24\u7aef\u90fd\u4e3a\u4f4e\u7535\u5e73\u3002<\/p>\n\n\n\n

\u4ece\u53f3\u5411\u5de6\u770b<\/p>\n\n\n\n

\u8fd9\u91cc\u8bf4\u660e\u4e00\u4e0b\u5f00\u6f0f\u8f93\u51fa\uff0c\u7531\u4e8e\u6709\u4e0a\u62c9\u7535\u963b\uff0c\u6240\u4ee5\u6ca1\u6709\u5916\u90e8\u5f71\u54cd\u7684\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0cS1A \u548c S2A \u9ed8\u8ba4\u90fd\u4f1a\u662f\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u5f53 S2A \u4e3a\u9ad8\u7535\u5e73 (VCC_S2) \u65f6\u5019\uff1a<\/p>\n\n\n\n

\u5047\u8bbe\u5de6\u4fa7 S1A \u4e3a\u9ad8\u7535\u5e73\uff08\u56e0\u4e3a\u662f\u5f00\u6f0f\u8f93\u51fa\uff0c\u6240\u4ee5\u5de6\u4fa7\u4e00\u822c\u6765\u8bf4\u88ab R10 \u4e0a\u62c9\u81f3\u9ad8\u7535\u5e73 (VCC_S1)\uff0c\u9664\u975e\u7ebf\u4e0a\u6709\u4f4e\u7535\u5e73\u62c9\u4f4e\uff0c\u8fd9\u91cc\u6211\u4eec\u4ecd\u7136\u5206\u4e24\u79cd\u60c5\u51b5\u8ba8\u8bba\uff09\uff0cMOS\u7ba1 VGS = 0\uff0c NM1 \u4e0d\u5bfc\u901a\uff0c\u5de6\u4fa7\u4f9d\u7136\u88abR10 \u4e0a\u62c9\u81f3\u9ad8\u7535\u5e73 (VCC_S1)\u3002\u4e24\u7aef\u90fd\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

\u5047\u8bbe\u5de6\u4fa7 S1A \u4e3a\u4f4e\u7535\u5e73\uff08\u6b63\u5e38\u4e0d\u4f1a\u53d1\u751f\uff0c\u539f\u56e0\u5c31\u662f\u5f00\u6f0f\u8f93\u51fa\uff09\uff0cMOS\u7ba1 VGS = VCC_S1\uff0c NM1 \u5bfc\u901a\uff0cS2A \u4e3a\u9ad8\u7535\u5e73\uff0c\u6240\u4ee5\u4f1a\u5bfc\u81f4 S1A \u7535\u538b\u4e0a\u5347\uff0c\u7b49 S1A \u4e0a\u5347\u5230 VCC_S1 \u7684\u65f6\u5019\uff0cNM1 \u622a\u6b62\uff0c\u4e24\u7aef\u90fd\u53d8\u6210\u9ad8\u7535\u5e73\uff08\u9664\u975e\u5f00\u59cb\u4f7f\u5f97 S1A \u4e3a\u4f4e\u7535\u5e73\u7684\u5916\u754c\u56e0\u6570\u4e00\u76f4\u5b58\u5728\uff0c\u8fd9\u662f\u5916\u90e8\u7684\u95ee\u9898\u4e0d\u505a\u8fc7\u591a\u8ba8\u8bba\uff09\u3002<\/p>\n\n\n\n

\u5f53 S2A \u4e3a\u4f4e\u7535\u5e73\u65f6\u5019\uff1a<\/p>\n\n\n\n

\u6b63\u5e38\u60c5\u51b5\u4e0b\u5de6\u4fa7 S1A \u4e3a\u9ad8\u7535\u5e73(VCC_S1)\uff0cMOS\u7ba1 VGS = 0\uff0c NM1 \u4e0d\u5bfc\u901a\uff0c\u4f46\u662f\u7531\u4e8e MOS \u7ba1\u7684\u5bc4\u751f\u4e8c\u6781\u7ba1\uff0c\u4f1a\u628a S1A \u4e0b\u62c9\u81f3\u4f4e\u7535\u5e73\uff08\u8fd9\u4e2a\u4f4e\u7535\u5e73\u4e0d\u662f0V\uff0c\u662f\u6bd4 S2A \u9ad8\u4e00\u4e2a\u4e8c\u6781\u7ba1\u538b\u964d\uff0c\u6bd4\u5982 0.7V\uff09\uff0c\u90a3\u4e48VGS =\uff08VCC_S1 – 0.7V\uff09\uff0c\u4f7f\u5f97 NM1\u5bfc\u901a\uff0c\u5bfc\u901a\u4ee5\u540e\uff0c\u90a3\u4e48 S1A \u548c S1B \u57fa\u672c\u76f8\u7b49\uff0c\u4e24\u7aef\u90fd\u4e3a\u4f4e\u7535\u5e73\u3002<\/p>\n\n\n\n

\u5982\u679c S1A \u5f00\u59cb\u5c31\u4e3a\u4f4e\u7535\u5e73\uff08\u6b63\u5e38\u4e0d\u4f1a\u53d1\u751f\uff09\uff0cMOS\u7ba1 VGS = VCC_S1\uff0c NM1 \u5bfc\u901a\uff0cS2A \u7684\u7535\u5e73\u4e0e S1A\u76f8\u7b49\uff0c\u4e3a\u4f4e\u7535\u5e73\u3002\u4e24\u7aef\u90fd\u4e3a\u4f4e\u7535\u5e73\u3002<\/p>\n\n\n\n

\u4f18\u70b9\uff1a\uff081\uff09\u9002\u7528\u4e8e\u4f4e\u9891\u4fe1\u53f7\u7535\u5e73\u8f6c\u6362\uff0c\u4ef7\u683c\u4f4e\u5ec9\u3002<\/p>\n\n\n\n

\uff082\uff09\u5bfc\u901a\u540e\uff0c\u538b\u964d\u6bd4\u4e09\u6781\u7ba1\u5c0f\u3002<\/p>\n\n\n\n

\uff083\uff09\u6b63\u53cd\u5411\u53cc\u5411\u5bfc\u901a\uff0c\u76f8\u5f53\u4e8e\u673a\u68b0\u5f00\u5173\u3002<\/p>\n\n\n\n

\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n\n\n\n

1\uff0e\u8be5\u7535\u8def\u53ea\u80fd\u7528\u4e8e\u6536\u53d1\u53cc\u65b9\u90fd\u662f\u5f00\u96c6\uff08Open Collector, OC\uff09\u6216\u5f00\u6f0f\uff08Open Drain, OD\uff09\u7ed3\u6784\u8f93\u51fa\u7684\u53cc\u5411\u4fe1\u53f7\u7ebf\u3002\u6bd4\u5982\u5e38\u89c1\u7684*I2C\u901a\u8baf*<\/strong><\/em>\u3002<\/p>\n\n\n\n

2\uff0eMOS\u7ba1\u7684S\u6781\u8981\u63a5\u5230\u4f4e\u7535\u6e90\u90a3\u8fb9\uff0c\u4e0d\u80fd\u63a5\u53cd\uff0cVCC_S1 <= VCC_S2\u3002<\/p>\n\n\n\n

3\uff0eMOS\u7ba1\u5bfc\u901a\u7535\u538b\u95e8\u9650\uff08Vth(GS)\u91cc\u9762\u7684\u6700\u5927\u503c\uff09\u9700\u8981\u5c0f\u4e8e\u4f4e\u7535\u6e90\u7535\u538b\u3002<\/p>\n\n\n\n

\"img\"\/<\/div><\/figure>\n\n\n\n

\u5982\u56fe\u662f2N7002\u7684NMOS\u7ba1\u7684\u90e8\u5206\u53c2\u6570\u8868\uff0c1V<Vgs<2.5V\u3002\u5982\u679c5V\u548c3.3V\u4e4b\u95f4\u7684\u4e92\u8f6c\uff0c\u53ef\u4ee5\u7528\u8fd9\u4e2aMOS\u7ba1\u3002\u4f46\u5982\u679c\u662f3.3V\u548c1.8V\u4e4b\u95f4\u7684\u4e92\u8f6c\uff0c\u5c31\u4e0d\u80fd\u4f7f\u7528\u8fd9\u4e2a\u7ba1\u5b50\u3002\u56e0\u4e3a\u5bfc\u901a\u95e8\u9650\u7535\u538b\u662f1~2.5V\u3002\u56e0\u4e3a\u53ef\u80fd\u4f1a\u7528\u5230\u5bfc\u901a\u7535\u538b\u5927\u4e8e1.8V\u7684\u5668\u4ef6\uff0c\u8fd9\u6837MOS\u7ba1\u53ef\u80fd\u6c38\u8fdc\u65e0\u6cd5\u5bfc\u901a\u4e86\u3002<\/p>\n\n\n\n

4\uff0e\u4f4e\u7535\u5e73\u6307\u7b49\u4e8e\u6216\u63a5\u8fd10V\uff1b\u9ad8\u7535\u5e73\u6307\u7b49\u4e8e\u6216\u63a5\u8fd1\u7535\u6e90\u7535\u538b\u3002\u6240\u4ee53.3V\u7535\u538b\u57df\u7684\u5668\u4ef6\uff0c\u5176\u9ad8\u7535\u5e73\u4e3a\u7b49\u4e8e\u6216\u63a5\u8fd13.3V\uff1b5V\u7535\u538b\u57df\u7684\u5668\u4ef6\uff0c\u5176\u9ad8\u7535\u5e73\u4e3a\u7b49\u4e8e\u6216\u63a5\u8fd15V\u3002\u5177\u4f53\u8981\u6c42\u770b\u82af\u7247\u7684\u6570\u636e\u624b\u518c\u662f\u600e\u4e48\u8bf4\u660e\u8fd9\u4e2a\u9650\u5b9a\u8303\u56f4\u7684\uff0c\u5e38\u89c1\u7684\u6bd4\u5982\u8bf40.3\u500d\u7684\u201c\u82af\u7247\u4f9b\u7535\u7535\u538b\u201d\u4ee5\u4e0b\u4e3a\u4f4e\u7535\u5e73\uff0c0.7\u500d\u7684\u201c\u82af\u7247\u4f9b\u7535\u7535\u538b\u201d\u4ee5\u4e0a\u4e3a\u9ad8\u7535\u5e73\u3002\u4e5f\u5c31\u662f\u8bf4\u201c\u82af\u7247\u4f9b\u7535\u7535\u538b\u201d\u4e3a5V\u7684\u65f6\u5019\uff0c5 x 0.3 = 1.5V \u4ee5\u4e0b\u4e3a\u4f4e\u7535\u5e73\uff0c5 x 0.7 = 3.5V \u4ee5\u4e0a\u4e3a\u9ad8\u7535\u5e73\u3002<\/p>\n\n\n\n

6\uff0e<\/strong>\u7535\u5e73\u8f6c\u6362\u82af\u7247\u6784\u6210\u7684\u53cc\u5411\u7535\u5e73\u8f6c\u6362\u7535\u8def<\/em><\/h3>\n\n\n\n
\"img\"\/<\/div><\/figure>\n\n\n\n

\u5de5\u4f5c\u539f\u7406\uff1a<\/p>\n\n\n\n

\u5982\u56fe7\u4f7f\u7528\u4e13\u7528\u7684\u7535\u5e73\u8f6c\u6362\u82af\u7247\u8fdb\u884c\u7535\u5e73\u8f6c\u6362\uff0c\u7535\u5e73\u8f6c\u6362\u82af\u7247\u4e3a\u4e0d\u540c\u7535\u538b\u57df\u4e4b\u95f4\u7684\u6570\u636e\u901a\u8baf\u53ca\u63a7\u5236\u63d0\u4f9b\u4e86\u65b9\u4fbf\u3002\u4f8b\u5982\u82af\u7247TXB0102\uff0c\u4f5c\u4e3a\u4e00\u6b3e\u53cc\u7535\u6e90\u4f9b\u7535\u7684\u53cc\u5411\u7535\u5e73\u8f6c\u6362\u82af\u7247\uff0c\u901a\u8fc7\u68c0\u6d4b\u5916\u90e8\u7aef\u53e3\u7684\u9a71\u52a8\u7535\u6d41\u6765\u5224\u522b\u8f6c\u6362\u65b9\u5411\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u5916\u90e8\u7684\u65b9\u5411\u63a7\u5236\u7ba1\u811a\u6765\u9009\u62e9\u63a7\u5236\u5668\u4ef6\u8f6c\u6362\u7684\u65b9\u5411\u3002\u56e0\u6b64\u5728\u4f7f\u7528\u5b83\u65f6\u975e\u5e38\u7701\u4e8b\uff0c\u8f6f\u4ef6\u4e0a\u4e5f\u65e0\u9700\u8003\u8651\u53bb\u66f4\u6539\u5b83\u7684\u8f6c\u6362\u65b9\u5411\u3002<\/p>\n\n\n\n

\u4f18\u70b9\uff1a<\/p>\n\n\n\n

\uff081) \u9a71\u52a8\u80fd\u529b\u5f3a\uff1a\u4e13\u7528\u82af\u7247\u7684\u8f93\u51fa\u4e00\u822c\u90fd\u4f7f\u7528\u4e86CMOS\u5de5\u827a\uff0c\u8f93\u51fa\u7535\u6d41\u53ef\u4ee5\u8fbe\u5230\u51e0\u5341mA\u3002<\/p>\n\n\n\n

\uff082\uff09\u6f0f\u7535\u6d41\u51e0\u4e4e\u4e3a0\uff1a\u5185\u90e8\u662f\u4e00\u4e9b\u653e\u5927\u3001\u6bd4\u8f83\u5668\uff0c\u8f93\u5165\u963b\u6297\u975e\u5e38\u9ad8\uff0c\u4e00\u822c\u90fd\u8fbe\u5230\u6570\u767eK\uff1b\u6f0f\u7535\u6d41\u57fa\u672c\u90fd\u662fnA\u7ea7\u522b\u7684\u3002<\/p>\n\n\n\n

\uff083) \u8def\u6570\u8f83\u591a\uff1a\u4e13\u7528\u82af\u7247\u9488\u5bf9\u4e0d\u540c\u7684\u5e94\u7528\uff0c\u4ece2\u8def\u5230\u6570\u5341\u8def\u90fd\u6709\uff0c\u5341\u5206\u9002\u5408\u5bf9\u9762\u79ef\u8981\u6c42\u9ad8\u7684\u573a\u5408\u3002<\/p>\n\n\n\n

\uff084\uff09\u901f\u7387\u9ad8\uff1a\u4e13\u7528\u82af\u7247\u7531\u4e8e\u96c6\u6210\u5ea6\u8f83\u9ad8\uff0c\u5de5\u827a\u8f83\u9ad8\uff0c\u901f\u7387\u4ece\u6570\u767eK\u5230\u6570\u767eM\u7684\u9891\u7387\u90fd\u53ef\u4ee5\u505a\u3002<\/p>\n\n\n\n

\u7f3a\u70b9\uff1a<\/p>\n\n\n\n

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