{"id":2991,"date":"2025-11-03T17:37:44","date_gmt":"2025-11-03T09:37:44","guid":{"rendered":"https:\/\/www.siproin-ic.com\/ssp2617-single-channel-h-bridge-driver-chip-copy\/"},"modified":"2025-11-03T18:10:47","modified_gmt":"2025-11-03T10:10:47","slug":"ssp1220-three-wire-rtd-measurement","status":"publish","type":"post","link":"https:\/\/www.siproin-ic.com\/zh\/ssp1220-three-wire-rtd-measurement\/","title":{"rendered":"SSP1220 \u4e09\u7ebf\u70ed\u7535\u963b\u6d4b\u91cf\u4eea"},"content":{"rendered":"<h3>\u2160\u3001 \u4e09\u7ebf PT100 \u6e29\u5ea6\u6d4b\u91cf\u539f\u7406<\/h3>\n<p>\u4e09\u7ebf\u8fde\u63a5\u6cd5\u7684\u6838\u5fc3\u76ee\u7684\u662f\u6d88\u9664\u5f15\u7ebf\u7535\u963b\u5bf9\u6d4b\u91cf\u7cbe\u5ea6\u7684\u5f71\u54cd\u3002PT100 \u7684\u7535\u963b\u503c\u975e\u5e38\u5c0f\uff08100\u03a9 @ 0\u2103\uff09\uff0c\u800c\u8fde\u63a5\u5bfc\u7ebf\u7684\u7535\u963b\uff08\u5341\u5206\u4e4b\u51e0\u6b27\u59c6\u5230\u51e0\u6b27\u59c6\uff0c\u5199\u6210 R6\u3001R7\u3001R15\uff0c\u89c1\u4e09\u7ebf\u70ed\u7535\u963b\u6d4b\u8bd5\u539f\u7406\u56fe\uff09\u4f1a\u5e26\u6765\u4e0d\u53ef\u5ffd\u7565\u7684\u8bef\u5dee\u3002\u4e09\u7ebf\u5236\u7cfb\u7edf\u901a\u8fc7\u5de7\u5999\u7684\u7535\u8def\u8bbe\u8ba1\u89e3\u51b3\u4e86\u8fd9\u4e00\u95ee\u9898\uff0c\u4e09\u7ebf\u70ed\u7535\u963b\u7684\u6240\u6709\u4e09\u6839\u5bfc\u7ebf\u901a\u5e38\u957f\u5ea6\u76f8\u540c\uff0c\u56e0\u6b64\u5047\u8bbe\u4e09\u6839\u5bfc\u7ebf\u7684\u7535\u963b\u76f8\u7b49\uff08RL1 = RL2 = RL3\uff0c\u5373\u539f\u7406\u56fe\u4e2d\u7684 R6=R7=R15\uff09\uff0cSSP1220 \u7684\u5185\u90e8\u53cc\u7535\u6d41\u6e90 (IDAC) \u7528\u4e8e\u62b5\u6d88\u8fd9\u4e9b\u5bfc\u7ebf\u7535\u963b\u7684\u5f71\u54cd\u3002<\/p>\n<p>\u8be6\u7ec6\u89e3\u91ca\u6d4b\u91cf\u539f\u7406\uff1a<\/p>\n<ol>\n<li>\u5728 SSP1220 \u5185\u90e8\u4f7f\u7528\u4e24\u4e2a\u5339\u914d\u7684\u53ef\u7f16\u7a0b\u7535\u6d41\u6e90\uff08IDAC1 \u548c IDAC2\uff09\u5e76\u8f93\u51fa\u76f8\u540c\u7684\u7535\u6d41\uff1a \uff0c\u5efa\u8bae\u7535\u6d41\u6e90\u9009\u62e9\u5c0f\u4e8e 1mA\uff0c\u672c\u6d4b\u8bd5\u7684\u7535\u6d41\u6e90\u9009\u62e9\u503c\u4e3a 500uA\u3002<\/li>\n<li>\u5047\u5b9a PT100 \u7684\u4e09\u4e2a\u5f15\u7ebf\u7535\u963b\u76f8\u7b49\uff1aR6 = R7 = R15 = Rl<\/li>\n<li>SSP1220 \u901a\u8fc7\u4e00\u5bf9\u5dee\u5206\u8f93\u5165\uff08AIN0\u3001AIN1\uff09\u6d4b\u91cf PT100 \u4e0a\u7684\u7535\u538b\uff1a  V<sub>IN<\/sub> = V<sub>AIN1<\/sub> - V<sub>AIN0<\/sub><\/li>\n<\/ol>\n<p>\u800cV<sub>AIN1<\/sub> = I<sub>IDAC1<\/sub> x (R<sub>L1<\/sub>+R<sub>PT100<\/sub>)+ (I<sub>IDAC1<\/sub> + I<sub>IDAC2<\/sub>) x R<sub>L3<\/sub>, V<sub>AIN0<\/sub> = I<sub>IDAC2<\/sub> x R<sub>L2<\/sub> + (I<sub>IDAC1<\/sub> + I<sub>IDAC2<\/sub>) x R<sub>L3<\/sub><\/p>\n<p>\u56e0\u4e3a\uff1a\u6211<sub>IDAC1<\/sub> = I<sub>IDAC2<\/sub> = I<sub>IDAC<\/sub> \u548c R<sub>L1<\/sub> = R<sub>L2<\/sub> = R<sub>L3<\/sub> = R<sub>L<\/sub><\/p>\n<p>\u4ee3\u5165VIN = [I<sub>IDAC<\/sub> x (R<sub>L<\/sub> + R<sub>PT100<\/sub>)+ 2I<sub>IDAC<\/sub> x R<sub>L<\/sub>]- [IIDAC x RL + 2IIDAC x RL] = I<sub>IDAC<\/sub> x R<sub>L<\/sub> + I<sub>IDAC<\/sub> x R<sub>PT100<\/sub> + 2I<sub>IDAC<\/sub> x R<sub>L<\/sub> - 2I<sub>IDAC<\/sub> x R<sub>L<\/sub> = I<sub>IDAC<\/sub> x R<sub>PT100<\/sub><\/p>\n<p>\u901a\u8fc7\u5de7\u5999\u7684\u7535\u8def\u914d\u7f6e\uff0c\u5dee\u5206\u8f93\u5165\u7535\u538b VIN \u5b8c\u5168\u6d88\u9664\u4e86\u5f15\u7ebf\u7535\u963b\u7684\u5f71\u54cd\uff0c\u53ea\u5305\u62ec PT100 \u7535\u963b\u4e0a\u7684\u538b\u964d\u3002<\/p>\n<ol start=\"4\">\n<li>SSP1220 \u7684\u57fa\u51c6\u7535\u538b Vref \u662f\u901a\u8fc7\u9ad8\u7cbe\u5ea6\u5916\u90e8\u57fa\u51c6\u7535\u963b\u5668 Rref (R5) \u5408\u5e76\u4e24\u4e2a IDAC \u7535\u6d41\u4ea7\u751f\u7684\uff0c\u5373 Vref = (Iidac1 + Iidac2) * R<\/li>\n<li>\u5728\u8fdb\u884c\u6bd4\u7387\u6d4b\u91cf\u65f6\uff0c\u65e0\u8bba IDAC \u7535\u6d41\u7684\u7edd\u5bf9\u503c\u3001\u7cbe\u5ea6\u548c\u6f02\u79fb\u5982\u4f55\uff0c\u6700\u7ec8 ADC \u8f93\u51fa\u4ee3\u7801\u90fd\u4e0e (Rpt100) \/ (Rref) \u6210\u6bd4\u4f8b\uff0c\u540c\u65f6\u8fd8\u80fd\u62b5\u6d88\u5f15\u7ebf\u7535\u963b Rl1 \u548c Rl2 \u7684\u5f71\u54cd\uff1a<\/li>\n<\/ol>\n<p>\u5bf9\u4e8e 24 \u4f4d SSP1220\uff0c\u8f93\u51fa\u6570\u5b57\u4ee3\u7801\u4e3a<\/p>\n<p>\u4ee3\u7801 = (2<sup>23<\/sup> - 1) x (V<sub>IN<\/sub>\/V<sub>REF<\/sub>) = (2<sup>23<\/sup> - 1) x [R<sub>PT100<\/sub>\/(2 x R<sub>REF<\/sub>) ]<\/p>\n<p>\u901a\u8fc7 ADC \u4ee3\u7801\u53cd\u8f6c PT100 \u7535\u963b\u503c\uff1a<\/p>\n<p>R<sub>PT100<\/sub> = [\u4ee3\u7801\/\uff082<sup>23<\/sup>-1)] x 2 x R<sub>REF<\/sub><\/p>\n<p>\u6700\u540e\uff0c\u6839\u636e PT100 \u7684\u7535\u963b-\u6e29\u5ea6\u7279\u6027\uff08\u901a\u5e38\u4f7f\u7528 Callendar-Van Dusen \u65b9\u7a0b\u6216\u67e5\u8868\u6cd5\uff09\uff0c\u5c06 Rpt100 \u8f6c\u6362\u4e3a\u6e29\u5ea6\u503c\uff1aT = f (Rpt100)\u3002\u5bf9\u4e8e PT100\uff0c\u5728 0\u2103\u3001R0 = 100.00\u03a9 \u65f6\uff0c\u7535\u963b\u6e29\u5ea6\u7cfb\u6570\u7ea6\u4e3a\u03b1\u2248 0.00385 \u03a9\/\u03a9\/\u2103<\/p>\n<h3>\u2161\u3001\u786c\u4ef6\u7535\u8def\u8bbe\u8ba1<\/h3>\n<p>\u6839\u636e\u6570\u636e\u8868\u4e2d\u7684\u5178\u578b\u5e94\u7528\uff0c\u5178\u578b\u7684\u4e09\u7ebf PT100 \u8fde\u63a5\u7535\u8def\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-2992\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12201-300x106.png\" alt=\"\" width=\"422\" height=\"149\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12201-300x106.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12201-18x6.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12201.png 554w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><\/p>\n<ol>\n<li>\u7535\u8def\u8fde\u63a5\u8bf4\u660e<\/li>\n<\/ol>\n<ul>\n<li>PT100 \u8fde\u63a5\uff1aPT100 \uff08\u4e09\u7ebf\u5236\uff09\u7684\u8fde\u63a5\u5982\u793a\u610f\u56fe\u6240\u793a\u3002<\/li>\n<li>\u7535\u538b\u57fa\u51c6\u751f\u6210\uff1aIDAC1 \u8f93\u51fa\u7aef\u8fde\u63a5\u81f3 AIN2\uff08\u9700\u8981\u5185\u90e8\u8f6f\u4ef6\u914d\u7f6e\uff09\uff0cIDAC2 \u8f93\u51fa\u7aef\u8fde\u63a5\u81f3 AIN3\uff08\u9700\u8981\u5185\u90e8\u8f6f\u4ef6\u914d\u7f6e\uff09\uff0c\u4e24\u4e2a IDAC \u7535\u6d41\u5728\u8282\u70b9\u5904\u6c47\u5408\uff0c\u4e00\u8d77\u6d41\u7ecf\u5916\u90e8\u57fa\u51c6\u7535\u963b Rref(R5)\u3002REF \u7684\u53e6\u4e00\u7aef\u8fde\u63a5\u5230\u6a21\u62df\u5730 AVSS\u3002SSP1220 \u7684\u6b63\u57fa\u51c6\u8f93\u5165 REFP0 \u8fde\u63a5\u5230 RREF (R5) \u7684\u4e0a\u7aef\uff08IDAC \u5408\u5e76\u70b9\uff09\u3002SSP1220 \u7684\u8d1f\u57fa\u51c6\u8f93\u5165\u7aef REFN0 \u8fde\u63a5\u81f3 AVSS\u3002\u56e0\u6b64\uff0c\u57fa\u51c6\u7535\u538b VREF= (IIDAC1 + IIDAC2) * RREF\u3002<\/li>\n<li>\u4fe1\u53f7\u6d4b\u91cf\uff1aSSP1220 \u7684 AIN1 \u914d\u7f6e\u4e3a\u5dee\u5206\u6b63\u8f93\u5165 AINP\uff0cSSP1220 \u7684 AIN0 \u914d\u7f6e\u4e3a\u5dee\u5206\u8d1f\u8f93\u5165 AINN\uff0c\u56e0\u6b64\u6d4b\u91cf\u7535\u538b\u4e3a AIN1 \u548c AIN0 \u4e4b\u95f4\u7684\u7535\u4f4d\u5dee\u3002<\/li>\n<li>\u6ee4\u6ce2\u7535\u8def\uff1a\u9700\u8981\u5728\u6a21\u62df\u8f93\u5165\uff08AIN0\u3001AIN1\u3001AIN2\uff09\u548c\u57fa\u51c6\u8f93\u5165\uff08REFP0\uff09\u4e0a\u6dfb\u52a0 RC \u4f4e\u901a\u6ee4\u6ce2\u5668\uff0c\u4ee5\u5b9e\u73b0\u6297\u952f\u9f7f\u548c\u566a\u58f0\u6291\u5236\u3002\u8f93\u5165\u6ee4\u6ce2\u5668\uff1a\u7531 R1\u3001R2\u3001C1 \u548c C6\u3001C5 \u7ec4\u6210\u3002\u53c2\u8003\u6ee4\u6ce2\u5668\uff1a\u7531 R3\u3001R4\u3001C2 \u548c C3\u3001C4 \u7ec4\u6210\u3002\u4e3a\u4fdd\u6301\u523b\u5ea6\u6d4b\u91cf\u7684\u51c6\u786e\u6027\uff0c\u53c2\u8003\u6ee4\u6ce2\u5668\u7684\u622a\u6b62\u9891\u7387\u5e94\u4e0e\u8f93\u5165\u6ee4\u6ce2\u5668\u76f8\u5339\u914d\u3002<\/li>\n<\/ul>\n<h3>\u2162\u3001\u8bbe\u5907\u9009\u62e9\u548c\u53c2\u6570\u8ba1\u7b97<\/h3>\n<p>\u5047\u8bbe\u8bbe\u8ba1\u76ee\u6807\u5982\u4e0b\uff1aPT100 \u7c7b\u578b\uff1a\u4e09\u7ebf\u5236\uff1b\u6e29\u5ea6\u6d4b\u91cf\u8303\u56f4\uff1a-200\u00b0C ~ +850\u00b0C\uff1b\u7535\u6e90\u7535\u538b AVDD\uff1a3.3V\uff08AVSS = 0V\uff09\uff1bDAC \u7535\u6d41\uff1a500\u03bcA\uff08\u6bcf\u901a\u9053\uff09\uff1b\u6570\u636e\u901f\u7387\uff1a20 SPS\uff08\u4ee5\u83b7\u5f97\u6700\u4f73\u566a\u58f0\u6027\u80fd\uff09\u3002<\/p>\n<ol>\n<li>\u53c2\u8003\u7535\u963b (Rref) \u7684\u9009\u62e9\u548c\u8ba1\u7b97<\/li>\n<\/ol>\n<p>Rref \u662f\u6574\u4e2a\u7cfb\u7edf\u51c6\u786e\u6027\u7684\u6838\u5fc3\u3002\u5176\u529f\u80fd\u662f\u4ea7\u751f ADC \u7684\u57fa\u51c6\u7535\u538b V ref\uff0c\u5176\u7cbe\u5ea6\u548c\u7a33\u5b9a\u6027\u76f4\u63a5\u51b3\u5b9a\u6d4b\u91cf\u7ed3\u679c\u3002<\/p>\n<p>\u7535\u963b\u8ba1\u7b97\uff1a<\/p>\n<p>\u4e3a\u4e86\u6700\u5927\u9650\u5ea6\u5730\u63d0\u9ad8 ADC \u7684\u91cf\u7a0b\u5e76\u6ee1\u8db3 PGA \u7684\u5171\u6a21\u7535\u538b\u8981\u6c42\uff0c\u901a\u5e38\u5c06 Vref \u8bbe\u7f6e\u4e3a\u7535\u6e90\u7535\u538b\u7684\u4e00\u534a\u5de6\u53f3\u3002\u5728\u672c\u8bbe\u8ba1\u4e2d\uff0cAVDD = 3.3V\uff0c\u76ee\u6807 VREF \u7ea6\u4e3a 1.65V\u3002<\/p>\n<p>I<sub>IDAC<\/sub> = I_IDAC1 + I_IDAC2 = 500uA + 500uA = 1mA<\/p>\n<p>R<sub>REF<\/sub> = V<sub>REF<\/sub> \/(I<sub>IDAC1<\/sub> + I<sub>IDAC2<\/sub>) = 1.65V\/1mA = 1.65k\u03a9<\/p>\n<p>\u53ef\u4ee5\u9009\u62e9\u6807\u79f0\u503c\u4e3a 1.65 k\u03a9 \u7684\u7535\u963b\u5668\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c1.62k\u03a9 \u6216 1.69k\u03a9 \u4e5f\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u8fd1\u4f3c\u503c\u3002<\/p>\n<p>\u9074\u9009\u8981\u6c42\uff1a<\/p>\n<p>\u7cbe\u5ea6\uff1a\u81f3\u5c11 \u00b10.1%\uff0c\u9ad8\u7cbe\u5ea6\u5e94\u7528\u5efa\u8bae \u00b10.05% \u6216\u66f4\u9ad8\u3002<\/p>\n<p>\u6e29\u5ea6\u6f02\u79fb\uff1a\u5fc5\u987b\u975e\u5e38\u4f4e\uff0c\u5efa\u8bae\u4f7f\u7528 \u00b15 ppm\/\u00b0C \u6216 \u00b110 ppm\/\u00b0C \u7684\u7cbe\u5bc6\u8584\u819c\u7535\u963b\u3002<\/p>\n<p>\u957f\u671f\u7a33\u5b9a\u6027\uff1a\u9ad8\u3002<\/p>\n<p>\u5207\u52ff\u4f7f\u7528\u666e\u901a\u7684 1%\u3001100ppm\/\u00b0C \u7247\u5f0f\u7535\u963b\u5668\u3002<\/p>\n<ol start=\"2\">\n<li>IDAC \u7535\u6d41\u548c PGA \u589e\u76ca\u9009\u9879<\/li>\n<\/ol>\n<p>IDAC \u7535\u6d41\uff1a\u9009\u62e9 500\u03bcA\u3002\u8be5\u503c\u5728\u529f\u8017\u3001\u81ea\u70ed\u6548\u5e94\u548c\u4fe1\u53f7\u5e45\u5ea6\u4e4b\u95f4\u53d6\u5f97\u4e86\u826f\u597d\u7684\u5e73\u8861\u3002\u5982\u679c\u7535\u6d41\u592a\u5c0f\uff0c\u4fe1\u53f7\u4f1a\u5f88\u5f31\uff0c\u5bb9\u6613\u53d7\u566a\u58f0\u5f71\u54cd\uff1b\u7535\u6d41\u592a\u5927\u53ef\u80fd\u4f1a\u5bfc\u81f4 PT100 \u81ea\u70ed\u6216\u8d85\u8fc7 IDAC \u517c\u5bb9\u7535\u538b\u3002<\/p>\n<p>PGA \u589e\u76ca\u9009\u62e9\uff1aPT100 \u7684\u7535\u538b\u8f83\u5c0f\uff08\u4f8b\u5982 500\u03bcA \u00d7 100\u03a9 = 50mV\uff09\uff0c\u4f46\u4f7f\u7528\u6bd4\u7387\u6d4b\u91cf\uff08\u53c2\u8003\u7535\u538b\u4e5f\u6765\u81ea IDAC\uff09\uff0c\u56e0\u6b64\u65e0\u9700\u653e\u5927\u4ee5\u907f\u514d\u9971\u548c\uff0c\u589e\u76ca\u9009\u62e9\u4e3a 1X\u3002<\/p>\n<ol start=\"3\">\n<li>\u6ee4\u6ce2\u7535\u8def\u5143\u4ef6\u9009\u62e9<\/li>\n<\/ol>\n<p>\u6ee4\u6ce2\u7535\u963b\u5668\uff08R1\u3001R2\u3001R3\u3001R4\uff09\uff1a\u901a\u5e38\u9009\u62e9 1k\u03a9\u3002\u8be5\u503c\u8db3\u591f\u5927\u4ee5\u6709\u6548\u6ee4\u6ce2\uff0c\u8db3\u591f\u5c0f\u4ee5\u907f\u514d\u8f93\u5165\u7aef\u51fa\u73b0\u660e\u663e\u7684\u504f\u79fb\u7535\u538b\uff08\u7531\u4e8e\u8f93\u5165\u504f\u7f6e\u7535\u6d41\uff09\u3002\u5b83\u4eec\u8fd8\u8d77\u5230\u9650\u6d41\u4fdd\u62a4\u4f5c\u7528\u3002<\/p>\n<p>\u5dee\u5206\u6ee4\u6ce2\u7535\u5bb9\u5668\uff08C1\u3001C2\uff09\uff1a\u4e0e\u7535\u963b\u4e00\u8d77\u8bbe\u7f6e\u622a\u6b62\u9891\u7387\u3002fc = 1 \/ (2\u03c0 * (R1+R2) * C1)\u3002 \u5982\u679c R1+R2=2k\u03a9 \u5e76\u671f\u671b fc \u2248 16Hz\uff0c\u5219 C1 \u2248 1 \/ (2* 2000 * 16) \u2248 4.7\u03bcF\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u901a\u5e38\u4f7f\u7528 100nF (0.1\u03bcF) \u6765\u83b7\u5f97\u66f4\u5bbd\u7684\u566a\u58f0\u6291\u5236\u5e26\u5bbd\u3002\u7c7b\u578b\uff1a\u63a8\u8350\u4f7f\u7528 C0G\uff08NPO\uff09\u9676\u74f7\u7535\u5bb9\u5668\uff0c\u56e0\u4e3a\u5b83\u5177\u6709\u7a33\u5b9a\u7684\u4ecb\u7535\u5e38\u6570\u3001\u4f4e\u7535\u538b\u7cfb\u6570\u548c\u4f4e\u5fae\u58f0\u6548\u5e94\u3002<\/p>\n<p>\u5171\u6a21\u6ee4\u6ce2\u7535\u5bb9\u5668\uff08C5\u3001C6\u3001C3\u3001C4\uff09\uff1a\u901a\u5e38\u9009\u62e9\u6bd4\u5dee\u5206\u7535\u5bb9\u5c0f\u4e00\u4e2a\u6570\u91cf\u7ea7\u7684\u7535\u5bb9\uff0c\u5982 10nF\uff0c\u4ee5\u786e\u4fdd\u5dee\u5206\u7535\u5bb9\u7684\u4e0d\u5339\u914d\u4e0d\u4f1a\u5bfc\u81f4\u8fc7\u591a\u5171\u6a21\u566a\u58f0\u8f6c\u6362\u6210\u5dee\u5206\u566a\u58f0\u3002<\/p>\n<h3>\u2163\u3001\u8f6f\u4ef6\u914d\u7f6e<\/h3>\n<ol>\n<li><strong>\u4e3b\u903b\u8f91<\/strong><\/li>\n<\/ol>\n<p>float SSP1x20_read_temperature(void)<\/p>\n<p>{<\/p>\n<p>uint32_t ADC_data\uff1b<\/p>\n<p>uint32_t ADC_temp1\uff1b<\/p>\n<p>\/\/SSP1x20_read_register(SSP1x20_REG0, 4, &amp;Read_REGTab[0])\uff1b<\/p>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN0_AIN1 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_ON\uff1b<\/p>\n<p>Write_REGTab[1]=SSP1x20_DR_20SPS|SSP1x20_MODE_NORMAL|SSP1x20_SC|SSP1x20_TS_ON| SSP1x20_BCS_OFF;<\/p>\n<p>Write_REGTab[2]=SSP1x20_VREF_2048|SSP1x20_REJECT_OFF|SSP1x20_PSW_OFF | SSP1x20_IDAC_1000uA;<\/p>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>SSP1x20_WriteRegister(SSP1x20_REG0, 4, &amp;Write_REGTab[0])\uff1b<\/p>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START)\uff1b<\/p>\n<p>spi_adc_cs_low()\uff1b<\/p>\n<p>while (ADC_DRDY_GAIN == 1);\/\/SSP1x20_DRDYM_DRDY<\/p>\n<ol start=\"2\">\n<li><strong>\u7a0b\u5e8f\u7684\u4e3b\u8981\u914d\u7f6e\u548c\u8bf4\u660e<\/strong><\/li>\n<\/ol>\n<ul>\n<li><strong>\u914d\u7f6e\u5bc4\u5b58\u5668 0\uff1a\u591a\u8def\u590d\u7528\u5668\u548c\u589e\u76ca<\/strong><\/li>\n<\/ul>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN0_AIN1 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_ON\uff1b<\/p>\n<table width=\"607\">\n<tbody>\n<tr>\n<td width=\"94\">\u5bb9\u91cf<\/td>\n<td width=\"132\">\u914d\u7f6e<\/td>\n<td width=\"132\">\u529f\u80fd<\/td>\n<td width=\"248\">\u8bf4\u660e<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT7~BIT4<\/td>\n<td width=\"132\">MUX_AIN0_AIN1<\/td>\n<td width=\"132\">\u5dee\u5206\u8f93\u5165\u901a\u9053\u9009\u62e9<\/td>\n<td width=\"248\">AIN0 - AIN1 \u2192 \u7528\u4e8e PT100 \u7535\u538b\u6d4b\u91cf<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT3~BIT1<\/td>\n<td width=\"132\">GAIN_1\uff081 \u500d\u589e\u76ca\uff09<\/td>\n<td width=\"132\">\u589e\u76ca\u8bbe\u7f6e<\/td>\n<td width=\"248\">1\u00d7\uff08\u65e0\u9700\u653e\u5927\uff0c\u56e0\u4e3a Vin \u2248 1V\uff09<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT0<\/td>\n<td width=\"132\">PGA_BYPASS_ON<\/td>\n<td width=\"132\">PGA \u65c1\u8def<\/td>\n<td width=\"248\">\u5173\u95ed\u53ef\u7f16\u7a0b\u589e\u76ca\u653e\u5927\u5668\uff0c\u9632\u6b62\u4fe1\u53f7\u5931\u771f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><strong>\u914d\u7f6e\u5bc4\u5b58\u5668 1\uff1a\u91c7\u6837\u7387\u548c\u6a21\u5f0f<\/strong><\/li>\n<\/ul>\n<p>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_OFF | SSP1x20_BCS_OFF\uff1b<\/p>\n<table width=\"595\">\n<tbody>\n<tr>\n<td width=\"94\">\u5bb9\u91cf<\/td>\n<td width=\"113\">\u914d\u7f6e<\/td>\n<td width=\"142\">\u529f\u80fd<\/td>\n<td width=\"246\">\u8bf4\u660e<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT7~BIT5<\/td>\n<td width=\"113\">DR_20SPS<\/td>\n<td width=\"142\">\u6570\u636e\u4f20\u8f93\u901f\u7387<\/td>\n<td width=\"246\">20 \u6b21\/\u79d2 \u2192 \u9002\u7528\u4e8e\u7f13\u6162\u7684\u6e29\u5ea6\u53d8\u5316<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT4~BIT3<\/td>\n<td width=\"113\">\u6a21\u5f0f_\u6b63\u5e38<\/td>\n<td width=\"142\">\u6b63\u5e38\u5de5\u4f5c\u6a21\u5f0f<\/td>\n<td width=\"246\">\u975e\u5355\u4e00\u6216\u8fde\u7eed<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">\u6bd4\u6258<\/td>\n<td width=\"113\">SC<\/td>\n<td width=\"142\">\u5df2\u542f\u7528\u81ea\u52a8\u6821\u51c6\u529f\u80fd<\/td>\n<td width=\"246\">\u63d0\u9ad8\u7cbe\u786e\u5ea6\uff08\u5efa\u8bae\u5f00\u542f\uff09<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT1<\/td>\n<td width=\"113\">TS_OFF<\/td>\n<td width=\"142\">\u7981\u7528\u5185\u90e8\u6e29\u5ea6\u4f20\u611f\u5668<\/td>\n<td width=\"246\">TS_ON \u6253\u5f00\u5185\u90e8\u6e29\u5ea6\u4f20\u611f\u5668\uff0c\u6d4b\u91cf\u5916\u90e8\u6e29\u5ea6\u7684\u914d\u7f6e\u4e0d\u8d77\u4f5c\u7528\uff08\u8be5\u914d\u7f6e\u5177\u6709\u6700\u9ad8\u4f18\u5148\u7ea7\uff09\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u00a0<\/strong><\/p>\n<ul>\n<li><strong>\u914d\u7f6e\u5bc4\u5b58\u5668 2\uff1a\u5e26 IDAC \u7684\u57fa\u51c6\u7535\u538b<\/strong><\/li>\n<\/ul>\n<p>Write_REGTab[2] = SSP1x20_VREF_2048 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_500uA\uff1b<\/p>\n<table width=\"597\">\n<tbody>\n<tr>\n<td width=\"94\">\u5bb9\u91cf<\/td>\n<td width=\"113\">\u914d\u7f6e<\/td>\n<td width=\"170\">\u529f\u80fd<\/td>\n<td width=\"220\">\u8bf4\u660e<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT7~BIT6<\/td>\n<td width=\"113\">VREF_2048<\/td>\n<td width=\"170\">\u5916\u90e8\u57fa\u51c6\u7535\u538b<\/td>\n<td width=\"220\">\u4f7f\u7528\u5916\u90e8 R_REFR_REF \u751f\u6210\u57fa\u51c6\u7535\u538b\uff08\u4f8b\u5982 1.65k\u03a9\uff09\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT5~BIT4<\/td>\n<td width=\"113\">REJECT_OFF<\/td>\n<td width=\"170\">\u65e0\u9677\u6ce2\u6ee4\u6ce2<\/td>\n<td width=\"220\">\u65e0\u9700\u6297\u7535\u6e90\u9891\u7387\u5e72\u6270<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT3<\/td>\n<td width=\"113\">PSW_OFF<\/td>\n<td width=\"170\">\u4e0d\u8981\u542f\u7528\u7535\u6e90\u5f00\u5173<\/td>\n<td width=\"220\">\u4fdd\u6301\u6b63\u5e38\u4f9b\u7535<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">BIT2~BIT0<\/td>\n<td width=\"113\">IDAC_500uA<\/td>\n<td width=\"170\">\u6fc0\u52b1\u7535\u6d41<\/td>\n<td width=\"220\">\u8bbe\u7f6e\u4e3a 500 \u03bcA\uff0c\u4ee5\u907f\u514d 3.9k\u03a9 \u00d7 1mA = 3.9V &gt; 3.3V \u8fc7\u538b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u00a0<\/strong><strong>\u00a0<\/strong><\/p>\n<table width=\"595\">\n<tbody>\n<tr>\n<td width=\"113\">\u5bb9\u91cf<\/td>\n<td width=\"123\">\u914d\u7f6e<\/td>\n<td width=\"151\">\u529f\u80fd<\/td>\n<td width=\"208\">\u8bf4\u660e<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">BIT7~BIT5<\/td>\n<td width=\"123\">IDAC1_AIN2<\/td>\n<td width=\"151\">IDAC1 \u8f93\u51fa\u81f3 AIN2<\/td>\n<td width=\"208\">\u6fc0\u52b1\u7535\u6d41\u6d41\u7ecf PT100 \u7684\u4e0a\u7aef<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">BIT4~BIT2<\/td>\n<td width=\"123\">IDAC2_AIN3<\/td>\n<td width=\"151\">IDAC2 \u8f93\u51fa\u81f3 AIN3<\/td>\n<td width=\"208\">\u8fd4\u56de\u8def\u5f84\u4ee5\u62b5\u6d88\u5bfc\u7ebf\u7535\u963b<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">BIT1<\/td>\n<td width=\"123\">DRDYM_DRDY<\/td>\n<td width=\"151\">DRDY \u6a21\u5f0f<\/td>\n<td width=\"208\">\u4f7f\u7528 DRDY \u4fe1\u53f7\u901a\u77e5\u60a8\u8f6c\u6362\u5df2\u5b8c\u6210<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>(4) \u914d\u7f6e\u5bc4\u5b58\u5668 3\uff1a\u5e26 DRDY \u7684 IDAC \u8def\u7531\u901a\u9053<\/strong><\/p>\n<ol start=\"3\">\n<li><strong>\u4e09\u7ebf PT100 \u78c1\u82af\uff1a<\/strong><\/li>\n<\/ol>\n<p>\u5f53\u524d\u8def\u5f84\uff1a<\/p>\n<ul>\n<li>IDAC1 \u2192 AIN2 \u2192 PT100 \u2192 AIN1<\/li>\n<li>IDAC2 \u2192 AIN3 \u2192 AIN1\uff08\u8fd4\u56de\uff09<\/li>\n<li>\u4e24\u4e2a\u7535\u6d41\u76f8\u7b49 \u2192 \u62b5\u6d88 R_LEAD2R_LEAD2 \u4e0a\u7684\u538b\u964d<\/li>\n<\/ul>\n<p><strong>uint32_t<\/strong> raw_u24 = SSP1x20_read_data_drdy()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>SSP1220 \u8f93\u51fa <strong>24 \u4f4d\u6570\u636e<\/strong>\u4f46 MCU \u901a\u5e38\u4ee5 32 \u4f4d\u8bfb\u53d6\uff08SPI \u4e00\u6b21\u8bfb\u53d6 4 \u4e2a\u5b57\u8282\uff09\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u5982\u679c<\/strong> (raw &lt; 0) raw = -raw\uff1b<\/p>\n<p>PT100 \u7535\u538b <strong>\u59cb\u7ec8\u4e3a\u6b63 <\/strong>(\u7535\u6d41\u4ece AIN0 \u6d41\u5411 AIN1\uff09\u3002<\/p>\n<p>\u5982\u679c raw &lt; 0\uff0c\u5219 <strong>AIN0 \u548c AIN1 \u8f6f\u4ef6\u914d\u7f6e\u76f8\u53cd\u3002<\/strong><\/p>\n<p>printf(\"Raw: %ld, R=%.3f \u03a9, Temp=%.2f \u00b0C\\r\\n\", raw, R_pt100, temperature)\uff1b<\/p>\n<p>\u6253\u5370 <strong>\u8ba1\u7b97\u7535\u963b\u503c\u548c\u6700\u7ec8\u6e29\u5ea6<\/strong> \u4fbf\u4e8e\u8c03\u8bd5<\/p>\n<p>\u5982\u679c Raw \u4e3a\u8d1f\u503c\u2192 \u914d\u7f6e\u5219\u76f8\u53cd<\/p>\n<p>\u5982\u679c R &gt; 1400\u03a9 \u2192 \u8868\u793a IDAC \u6216 Rref \u8bbe\u7f6e\u9519\u8bef<\/p>\n<p>\u5982\u679c\u6e29\u5ea6 = -999 \u2192 \u8868\u793a R \u503c\u8d85\u51fa\u5408\u7406\u8303\u56f4<\/p>\n<p>&nbsp;<\/p>\n<h3>\u2164\u3001\u6d4b\u91cf\u7a0b\u5e8f\u548c\u7ed3\u679c<\/h3>\n<ol>\n<li><strong>\u4e24\u7aef\u7684 PT100 \u7535\u538b\u6d4b\u91cf\u7a0b\u5e8f\uff1a<\/strong><\/li>\n<\/ol>\n<p>void SSP1x20_ADC_MeasurePt100(void)<\/p>\n<p>{<\/p>\n<p>float V_ref = 2.048; \/\/ \u5185\u90e8\u57fa\u51c6\u7535\u538b 2.048V<\/p>\n<p>\/\/printf(\"\\rrn Multi-point single voltage measurement\\r\\n\")\uff1b<\/p>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN1_AIN0 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_OFF\uff1b<\/p>\n<p>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_OFF | SSP1x20_BCS_OFF\uff1b<\/p>\n<p>Write_REGTab[2] = SSP1x20_VREF_REF0 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_500uA\uff1b<\/p>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>SSP1x20_WriteRegister(SSP1x20_REG0, 4, &amp;Write_REGTab[0])\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>printf(\"Write_REGTab[0]=%x\\r\\n\", Write_REGTab[0])\uff1b<\/p>\n<p>printf(\"Write_REGTab[1]=%x\\r\\n\", Write_REGTab[1])\uff1b<\/p>\n<p>printf(\"Write_REGTab[2]=%x\\r\\n\", Write_REGTab[2])\uff1b<\/p>\n<p>printf(\"Write_REGTab[3]=%x\\r\\n\", Write_REGTab[3])\uff1b<\/p>\n<p>\u5f53 (1)<\/p>\n<p>{<\/p>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START); \/\/ \u542f\u7528\u8fde\u7eed\u6d4b\u91cf\u65f6\uff0c\u8be5\u547d\u4ee4\u53ea\u53d1\u9001\u4e00\u6b21<\/p>\n<p>HAL_Delay(100)\uff1b<\/p>\n<p>spi_adc_cs_low()\uff1b<\/p>\n<p>}<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>SSP1220 \u6d4b\u8bd5\u7ed3\u679c<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-2993\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12202-300x137.png\" alt=\"\" width=\"300\" height=\"137\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12202-300x137.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12202-18x8.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12202.png 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<ol start=\"2\">\n<li><strong>SSP1220 \u5185\u90e8\u6e29\u5ea6\u6d4b\u91cf<\/strong><\/li>\n<\/ol>\n<p>\u5185\u90e8\u6e29\u5ea6\u6d4b\u8bd5\u529f\u80fd<\/p>\n<p>float SSP1x20_read_temperature(void)<\/p>\n<p>{<\/p>\n<p>uint32_t ADC_data\uff1b<\/p>\n<p>uint32_t ADC_temp1\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>\/\/SSP1x20_read_register(SSP1x20_REG0, 4, &amp;Read_REGTab[0])\uff1b<\/p>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN0_AIN1 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_ON\uff1b<\/p>\n<p>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_ON | SSP1x20_BCS_OFF\uff1b<\/p>\n<p>Write_REGTab[2] = SSP1x20_VREF_2048 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_1000uA\uff1b<\/p>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>SSP1x20_WriteRegister(SSP1x20_REG0, 4, &amp;Write_REGTab[0])\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START)\uff1b<\/p>\n<p>spi_adc_cs_low()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>while (ADC_DRDY_GAIN == 1);\/\/SSP1x20_DRDYM_DRDY<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u5185\u90e8\u6e29\u5ea6\u6d4b\u8bd5\u914d\u7f6e\u8be6\u60c5\uff1a<\/strong><\/p>\n<p><strong>\u00a0<\/strong>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_ON | SSP1x20_BCS_OFF\uff1b<\/p>\n<ul>\n<li>SSP1x20_TS_ON\uff1a <strong>\u542f\u7528\u5185\u90e8\u6e29\u5ea6\u4f20\u611f\u5668<\/strong> (\u91cd\u8981\uff09\uff0c\u8be5\u914d\u7f6e\u5177\u6709\u6700\u9ad8\u4f18\u5148\u7ea7<\/li>\n<li>SSP1x20_SC\uff1a \u6267\u884c\u81ea\u6821\u51c6\uff08\u63a8\u8350\uff09<\/li>\n<li><strong>20SPS<\/strong>:\u4f4e\u901f\u3001\u9ad8\u7cbe\u5ea6\uff0c\u9002\u7528\u4e8e\u6e29\u5ea6\u6d4b\u91cf<\/li>\n<\/ul>\n<p>Write_REGTab[2] = SSP1x20_VREF_2048 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_1000uA\uff1b<\/p>\n<ul>\n<li>SSP1x20_VREF_2048: \u4f7f\u7528 <strong>\u5185\u7f6e 2.048V \u57fa\u51c6\u7535\u538b<\/strong> (\u975e\u5916\u90e8 REF0\uff01\uff09\u3002\n<ul>\n<li>\u56e0\u4e3a\u5185\u90e8\u6e29\u5ea6\u4f20\u611f\u5668 <strong>\u7edd\u5bf9\u7535\u538b\u8f93\u51fa<\/strong>, a <strong>\u56fa\u5b9a\u57fa\u51c6\u7535\u538b <\/strong>\u5fc5\u987b\u7528\u6765\u8f6c\u6362\u6e29\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>IDAC_1000uA<\/strong>:\u867d\u7136\u542f\u7528\u4e86 IDAC\u3001 <strong>\u5904\u4e8e TS_ON \u6a21\u5f0f\u7684 IDAC \u4e0d\u5f71\u54cd\u5185\u90e8\u6e29\u5ea6\u6d4b\u91cf<\/strong> (\u53ef\u5ffd\u7565\u4e0d\u8ba1\uff09\u3002<\/li>\n<\/ul>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<ul>\n<li>\u914d\u7f6e IDAC \u5f15\u811a\u548c DRDY\uff0c\u4f46 <strong>\u5bf9\u5185\u90e8\u6e29\u5ea6\u6d4b\u91cf\u6ca1\u6709\u5f71\u54cd<\/strong> (\u53ea\u9700\u4fdd\u6301\u5bc4\u5b58\u5668\u5b8c\u597d\u65e0\u635f\uff09\u3002<\/li>\n<li><strong>2 \u542f\u52a8\u8f6c\u6362\u5e76\u7b49\u5f85 DRDY<\/strong><\/li>\n<\/ul>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START); SPI_ADC_CS_LOW()\uff1b<strong>\u867d\u7136<\/strong> (adc_drdy_gain == 1); \/\/ \u7b49\u5f85 drdy \u53d8\u4f4e<\/p>\n<ul>\n<li>\u53d1\u9001 START\uff08\u5f00\u59cb\uff09\u547d\u4ee4\u542f\u52a8\u8fde\u7eed\u8f6c\u6362<\/li>\n<li>\u7b49\u5f85 <strong>\u5c06 DRDY \u5f15\u811a\u7f6e\u4f4e<\/strong>\u8868\u793a\u6570\u636e\u5df2\u51c6\u5907\u5c31\u7eea<\/li>\n<\/ul>\n<p>\u5ba4\u5185\u5ba4\u6e29\u7684\u6d4b\u91cf\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-2994\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12203-300x141.png\" alt=\"\" width=\"300\" height=\"141\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12203-300x141.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12203-18x8.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12203.png 479w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h2>3.\u5916\u90e8\u6e29\u5ea6\u6d4b\u91cf\uff08\u65b9\u6cd5 1\uff0c\u7b80\u5316\u7cfb\u6570 0.385 \u8ba1\u7b97\uff09<\/h2>\n<p>\u5916\u90e8\u6e29\u5ea6\u6d4b\u8bd5\u76f8\u5173\u4ee3\u7801\uff1a<\/p>\n<p>uint32_t ADC_gain_value = 0; \/\/ \u8bfb\u51fa\u6570\u636e<\/p>\n<p>uint32_t ADC_value = 0; \/\/ \u6d4b\u91cf\u6570\u636e\u503c<\/p>\n<p>\u6d6e\u70b9\u6570 tmpPt100=0\uff1b<\/p>\n<p>float RTD=0\uff1b<\/p>\n<p>void SSP1x20_ADC_Measure(void)<\/p>\n<p>{<\/p>\n<p>&nbsp;<\/p>\n<p>printf(\"\\rr\\n Multi-point single voltage measurement \uff08\u591a\u70b9\u5355\u7535\u538b\u6d4b\u91cf\uff09\")\uff1b<\/p>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN1_AIN0 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_OFF; SSP1x20_MUX_AIN1_AIN0 \u63a5\u53e3 AIN1 AIN0 \u5e94\u6839\u636e\u5b9e\u9645\u7535\u8def\u56fe\u8fdb\u884c\u9009\u62e9<\/p>\n<p>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_OFF | SSP1x20_BCS_OFF\uff1b<\/p>\n<p>Write_REGTab[2] = SSP1x20_VREF_REF0 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_500uA\uff1b<\/p>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>SSP1x20_WriteRegister(SSP1x20_REG0, 4, &amp;Write_REGTab[0])\uff1b<\/p>\n<p>printf(\"Write_REGTab[0]=%x\\r\\n\", Write_REGTab[0])\uff1b<\/p>\n<p>printf(\"Write_REGTab[1]=%x\\r\\n\", Write_REGTab[1])\uff1b<\/p>\n<p>printf(\"Write_REGTab[2]=%x\\r\\n\", Write_REGTab[2])\uff1b<\/p>\n<p>printf(\"Write_REGTab[3]=%x\\r\\n\", Write_REGTab[3])\uff1b<\/p>\n<p>\u5f53 (1)<\/p>\n<p>{<\/p>\n<p>&nbsp;<\/p>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START); \u542f\u7528\u8fde\u7eed\u6d4b\u91cf\u65f6\uff0c\u8be5\u547d\u4ee4\u53ea\u53d1\u9001\u4e00\u6b21<\/p>\n<p>HAL_Delay(100)\uff1b<\/p>\n<p>spi_adc_cs_low()\uff1b<\/p>\n<p>ADC_gain_value =0\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>ADC_gain_value = SPI_ADC_ReadByte()\uff1b<\/p>\n<p>ADC_gain_value = (ADC_gain_value &lt;&lt; 8) | SPI_ADC_ReadByte()\uff1b<\/p>\n<p>ADC_gain_value = (ADC_gain_value &lt;&lt; 8) | SPI_ADC_ReadByte()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>spi_adc_cs_high()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>RTD = 1650*( (float)ADC_gain_value \/(0x3fffff));\/\/Reference \u7535\u963b 1650 \u6b27\u59c6<\/p>\n<p>tmpPt100 = (RTD-100)\/0.38\uff1b<\/p>\n<p>__NOP()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>printf(\"R=%.3f \u03a9, Temp=%.2f \u00b0C\\r\\n\",RTD, tmpPt100 )\uff1b<\/p>\n<p>}<\/p>\n<p>\u4e09\u7ebf\u70ed\u7535\u963b\u6d4b\u91cf\u51b0\u6c34\u6df7\u5408\u7269\u6e29\u5ea6\u7684\u7ed3\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><strong> <img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-2995\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12204-263x300.png\" alt=\"\" width=\"156\" height=\"178\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12204-263x300.png 263w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12204-11x12.png 11w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12204.png 287w\" sizes=\"(max-width: 156px) 100vw, 156px\" \/> <img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-2996\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12205-300x199.png\" alt=\"\" width=\"371\" height=\"246\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12205-300x199.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12205-18x12.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12205.png 414w\" sizes=\"(max-width: 371px) 100vw, 371px\" \/><\/strong><\/p>\n<p><strong>\u5916\u90e8\u6e29\u5ea6\u6d4b\u91cf\uff08\u65b9\u6cd5\u4e8c\uff0c\u901a\u8fc7\u5361\u4f26\u8fbe-\u8303\u675c\u68ee\u65b9\u7a0b\u8ba1\u7b97\uff09\u66f4\u4e3a\u7cbe\u786e<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>\u4e3b\u4ee3\u7801<\/p>\n<p>\/\/\u9ad8\u7cbe\u5ea6 RTD -&gt; \u6e29\u5ea6<\/p>\n<p>\u9759\u6001\u6d6e\u5b50 rtd_to_\u6e29\u5ea6_iec60751(\u6d6e\u5b50 rtd)<\/p>\n<p>{<\/p>\n<p>if (rtd &lt; 0.0f) return -999.0f; \/\/ \u975e\u6cd5\u503c<\/p>\n<p>&nbsp;<\/p>\n<p>float t = (rtd - R0_PT100) \/ 0.385f; \/\/ initial guess<\/p>\n<p>&nbsp;<\/p>\n<p>\u5982\u679c (rtd &lt;= R0_PT100) {<\/p>\n<p>\/\/T &lt; = 0\u00b0C\uff1a\u4f7f\u7528\u5b8c\u6574\u65b9\u7a0b<\/p>\n<p>for (int i = 0; i &lt; 10; i++) {<\/p>\n<p>float rt_calc = R0_PT100 * (1.0f + A_COEFF*t + B_COEFF*t*t + C_COEFF*(t - 100.0f)*t*t*t)\uff1b<\/p>\n<p>float dr_dt = R0_PT100 * (A_COEFF + 2.0f*B_COEFF*t + C_COEFF*(4.0f*t*t*t - 300.0f*t*t))\uff1b<\/p>\n<p>float error = rt_calc - rtd\uff1b<\/p>\n<p>t -= \u8bef\u5dee \/ dr_dt\uff1b<\/p>\n<p>if (fabsf(error) &lt; 0.001f) break\uff1b<\/p>\n<p>}<\/p>\n<p>\u5426\u5219 {<\/p>\n<p>\/\/ T &gt;= 0\u00b0C:: \u4f7f\u7528\u7b80\u5316\u65b9\u7a0b<\/p>\n<p>for (int i = 0; i &lt; 10; i++) {<\/p>\n<p>float rt_calc = R0_PT100 * (1.0f + A_COEFF*t + B_COEFF*t*t)\uff1b<\/p>\n<p>float dr_dt = R0_PT100 * (A_COEFF + 2.0f*B_COEFF*t)\uff1b<\/p>\n<p>float error = rt_calc - rtd\uff1b<\/p>\n<p>t -= \u8bef\u5dee \/ dr_dt\uff1b<\/p>\n<p>if (fabsf(error) &lt; 0.001f) break\uff1b<\/p>\n<p>}<\/p>\n<p>}<\/p>\n<p>\u8fd4\u56de t\uff1b<\/p>\n<p>}<\/p>\n<p>\/**<\/p>\n<p>* \u7b80\u5355\u6a21\u62df\u901a\u9053 ADC \u6d4b\u91cf\uff08\u5916\u90e8\u6e29\u5ea6\u6d4b\u91cf\uff09<\/p>\n<p>* \u53c2\u6570 \u65e0<\/p>\n<p>* @retval \u65e0<\/p>\n<p>*\/<\/p>\n<p>uint32_t ADC_gain_value = 0; \/\/ \u8bfb\u51fa\u6570\u636e<\/p>\n<p>uint32_t ADC_value = 0; \/\/ \u6d4b\u91cf\u6570\u636e\u503c<\/p>\n<p>\u6d6e\u70b9\u6570 tmpPt100=0\uff1b<\/p>\n<p>float RTD=0\uff1b<\/p>\n<p>void SSP1x20_ADC_Measure(void)<\/p>\n<p>{<\/p>\n<p>&nbsp;<\/p>\n<p>printf(\"\\rr\\n Multi-point single voltage measurement \uff08\u591a\u70b9\u5355\u7535\u538b\u6d4b\u91cf\uff09\")\uff1b<\/p>\n<p>Write_REGTab[0] = SSP1x20_MUX_AIN1_AIN0 | SSP1x20_GAIN_1 | SSP1x20_PGA_BYPASS_OFF\uff1b<\/p>\n<p>Write_REGTab[1] = SSP1x20_DR_20SPS | SSP1x20_MODE_NORMAL | SSP1x20_SC | SSP1x20_TS_OFF | SSP1x20_BCS_OFF\uff1b<\/p>\n<p>Write_REGTab[2] = SSP1x20_VREF_REF0 | SSP1x20_REJECT_OFF | SSP1x20_PSW_OFF | SSP1x20_IDAC_500uA\uff1b<\/p>\n<p>Write_REGTab[3] = SSP1x20_IDAC1_AIN2 | SSP1x20_IDAC2_AIN3 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>\/\/ Write_REGTab[3] = SSP1x20_IDAC1_AIN3 | SSP1x20_IDAC2_AIN2 | SSP1x20_DRDYM_DRDY\uff1b<\/p>\n<p>SSP1x20_WriteRegister(SSP1x20_REG0, 4, &amp;Write_REGTab[0])\uff1b<\/p>\n<p>printf(\"Write_REGTab[0]=%x\\r\\n\", Write_REGTab[0])\uff1b<\/p>\n<p>printf(\"Write_REGTab[1]=%x\\r\\n\", Write_REGTab[1])\uff1b<\/p>\n<p>printf(\"Write_REGTab[2]=%x\\r\\n\", Write_REGTab[2])\uff1b<\/p>\n<p>printf(\"Write_REGTab[3]=%x\\r\\n\", Write_REGTab[3])\uff1b<\/p>\n<p>\u5f53 (1)<\/p>\n<p>{<\/p>\n<p>SSP1x20_SendCommand(SSP1x20_CMD_START); \u542f\u7528\u8fde\u7eed\u6d4b\u91cf\u65f6\uff0c\u8be5\u547d\u4ee4\u53ea\u53d1\u9001\u4e00\u6b21<\/p>\n<p>HAL_Delay(100)\uff1b<\/p>\n<p>spi_adc_cs_low()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>ADC_gain_value =0\uff1b<\/p>\n<p>ADC_gain_value = SPI_ADC_ReadByte()\uff1b<\/p>\n<p>ADC_gain_value = (ADC_gain_value &lt;&lt; 8) | SPI_ADC_ReadByte()\uff1b<\/p>\n<p>ADC_gain_value = (ADC_gain_value &lt;&lt; 8) | SPI_ADC_ReadByte()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>spi_adc_cs_high()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>#define CALIBRATED_FULL_SCALE 4210300.0f \/\/ \u6821\u51c6\u6570\u636e<\/p>\n<p>&nbsp;<\/p>\n<p>RTD = 1650.0f * ((float)ADC_gain_value \/ CALIBRATED_FULL_SCALE)\uff1b<\/p>\n<p>tmpPt100 = rtd_to_temperature_iec60751(RTD)\uff1b<\/p>\n<p>__NOP()\uff1b<\/p>\n<p>&nbsp;<\/p>\n<p>printf(\"R=%.3f \u03a9, Temp=%.2f \u00b0C\\r\\n\",RTD, tmpPt100 )\uff1b<\/p>\n<p>}<\/p>\n<p>}<\/p>\n<p>&nbsp;<\/p>\n<p>\u6d4b\u8bd5\u7ed3\u679c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p>&nbsp;<\/p>\n<p>\u70ed\u6c34\u6e29\u5ea6\u6d4b\u8bd5\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-2997\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12206-300x199.png\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12206-300x199.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12206-18x12.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12206.png 675w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-2998\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12207-300x275.jpg\" alt=\"\" width=\"215\" height=\"197\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12207-300x275.jpg 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12207-13x12.jpg 13w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12207.jpg 546w\" sizes=\"(max-width: 215px) 100vw, 215px\" \/><\/p>\n<p>\u51b0\u6c34\u6df7\u5408\u7269\u6d4b\u8bd5\uff1a<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-2999\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12208-300x205.png\" alt=\"\" width=\"300\" height=\"205\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12208-300x205.png 300w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12208-18x12.png 18w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12208.png 670w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-3000\" src=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12209-197x300.jpg\" alt=\"\" width=\"147\" height=\"224\" srcset=\"https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12209-197x300.jpg 197w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12209-8x12.jpg 8w, https:\/\/www.siproin-ic.com\/wp-content\/uploads\/2025\/11\/12209.jpg 391w\" sizes=\"(max-width: 147px) 100vw, 147px\" \/><\/p>\n<h2>4.\u5916\u90e8\u6e29\u5ea6\u6d4b\u8bd5\u914d\u7f6e\u8be6\u60c5\uff1a<\/h2>\n<table width=\"727\">\n<thead>\n<tr>\n<td width=\"158\"><strong>\u6ce8\u518c<\/strong><\/td>\n<td width=\"196\"><strong>\u914d\u7f6e\u503c\uff08\u60a8\u7684\u4ee3\u7801\uff09<\/strong><\/td>\n<td width=\"152\"><strong>\u529f\u80fd\u8bf4\u660e<\/strong><\/td>\n<td width=\"211\"><strong>\u4e3a\u4ec0\u4e48\u9009\u62e9\u8fd9\u4e2a\uff1f<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td rowspan=\"4\" width=\"158\"><strong>REG0<\/strong><br \/>\nWrite_REGTab[0]<\/td>\n<td width=\"196\">SSP1x20_MUX_AIN1_AIN0<br \/>\n| SSP1x20_GAIN_1<br \/>\n|SSP1x20_PGA_BYPASS_OFF<\/td>\n<td width=\"152\"><strong>\u8f93\u5165\u901a\u9053\u9009\u62e9 + \u589e\u76ca\u8bbe\u7f6e<\/strong><\/td>\n<td width=\"211\">&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_MUX_AIN1_AIN0<\/td>\n<td width=\"152\">\u5dee\u5206\u8f93\u5165 <strong>AIN1 \u4e3a\u6b63\uff0cAIN0 \u4e3a\u8d1f<\/strong><\/td>\n<td width=\"211\">PT100 \u8fde\u63a5\u5230 AIN0 \u548c AIN1 \u7684\u4e24\u7aef\uff0c\u9700\u8981\u5dee\u5206\u7535\u538b\u6d4b\u91cf\u3002\u26a0\ufe0f <strong>\u6ce8\u610f\u6781\u6027<\/strong>\u6ce8\u610f\uff1a\u5982\u679c\u914d\u7f6e\u76f8\u53cd\uff0c\u5219 ADC \u8f93\u51fa\u8d1f\u503c\uff08\u5982 0x800000\uff09\uff0c\u5bfc\u81f4\u6e29\u5ea6\u4e3a\u8d1f\u503c\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_GAIN_1<\/td>\n<td width=\"152\">\u589e\u76ca = 1<\/td>\n<td width=\"211\">PT100 \u7684\u7535\u538b\u8f83\u5c0f\uff08\u4f8b\u5982 500\u03bcA \u00d7 100\u03a9 = 50mV\uff09\uff0c\u4f46\u4f7f\u7528\u6bd4\u7387\u6d4b\u91cf\uff08\u53c2\u8003\u7535\u538b\u4e5f\u6765\u81ea IDAC\uff09\uff0c\u56e0\u6b64 <strong>\u65e0\u653e\u5927 <\/strong>\u4ee5\u907f\u514d\u9971\u548c\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_PGA_BYPASS_OFF<\/td>\n<td width=\"152\"><strong>\u65e0\u65c1\u8def PGA<\/strong><\/td>\n<td width=\"211\">\u4fdd\u6301 PGA \u529f\u80fd\uff08\u5373\u4f7f\u589e\u76ca=1\uff09\uff0c\u4ee5\u786e\u4fdd\u4fe1\u53f7\u8def\u5f84\u6b63\u5e38\u3002<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"6\" width=\"158\"><strong>REG1<\/strong><br \/>\nWrite_REGTab[1]<\/td>\n<td width=\"196\">SSP1x20_DR_20SPS<br \/>\n| SSP1x20_MODE_NORMAL<br \/>\n| SSP1x20_SC<br \/>\n| SSP1x20_TS_OFF<br \/>\n| SSP1x20_BCS_OFF<\/td>\n<td width=\"152\"><strong>\u6570\u636e\u4f20\u8f93\u901f\u7387 + \u8fd0\u884c\u6a21\u5f0f<\/strong><\/td>\n<td width=\"211\">&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_DR_20SPS<\/td>\n<td width=\"152\">\u91c7\u6837\u7387 = <strong>\u6bcf\u79d2 20 \u4e2a\u91c7\u6837\u70b9<\/strong><\/td>\n<td width=\"211\">\u4f4e\u901f\u53ef\u63d0\u9ad8\u7cbe\u5ea6\u3001\u6291\u5236\u566a\u97f3\uff0c\u5e76\u9002\u7528\u4e8e\u6e29\u5ea6\u6d4b\u91cf\uff08\u7f13\u6162\u53d8\u5316\uff09\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_MODE_NORMAL<\/td>\n<td width=\"152\">\u6b63\u5e38\u8fde\u7eed\u8f6c\u6362\u6a21\u5f0f<\/td>\n<td width=\"211\">\u8fde\u7eed\u6570\u636e\u8f93\u51fa\uff0c\u7528\u4e8e\u5b9e\u65f6\u76d1\u63a7\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_SC<\/td>\n<td width=\"152\"><strong>\u8fdb\u884c\u81ea\u6211\u6821\u51c6<\/strong><\/td>\n<td width=\"211\">\u6bcf\u6b21\u914d\u7f6e\u540e\u8fdb\u884c\u6821\u51c6\uff0c\u53ef\u6d88\u9664\u504f\u79fb\/\u589e\u76ca\u8bef\u5dee\u5e76\u63d0\u9ad8\u7cbe\u5ea6\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_TS_OFF<\/td>\n<td width=\"152\"><strong>\u5173\u95ed\u5185\u90e8\u6e29\u5ea6\u4f20\u611f\u5668<\/strong><\/td>\n<td width=\"211\">\u6211\u4eec\u6d4b\u91cf\u5916\u90e8 PT100\uff0c\u4e0d\u9700\u8981\u5185\u90e8\u6e29\u5ea6\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_BCS_OFF<\/td>\n<td width=\"152\">\u7981\u7528\u70e7\u65ad\u7535\u6d41\u6e90<\/td>\n<td width=\"211\">\u4e0d\uff0c\u4f60\u6ca1\u6709\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"158\"><strong>REG2<\/strong><br \/>\nWrite_REGTab[2]<\/td>\n<td width=\"196\">SSP1x20_VREF_REF0<br \/>\n| SSP1x20_REJECT_OFF<br \/>\n| SSP1x20_PSW_OFF<br \/>\nSSP1x20_IDAC_500uA<\/td>\n<td width=\"152\"><strong>\u57fa\u51c6\u7535\u538b + IDAC \u8bbe\u7f6e<\/strong><\/td>\n<td width=\"211\">&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">&nbsp;<\/td>\n<td width=\"196\">SSP1x20_VREF_REF0<\/td>\n<td width=\"152\">\u4f7f\u7528 <strong>\u5916\u90e8\u53c2\u7167 <\/strong>\u7535\u538b\uff08REF0 = AIN2\/AIN3 \u4e4b\u95f4\u7684\u7535\u538b\uff09\u3002<\/td>\n<td width=\"211\">\u5b9e\u65bd <strong>\u57fa\u4e8e\u6bd4\u7387\u7684\u6d4b\u91cf<\/strong>:ADC \u7ed3\u679c = (Vpt100 \/ Vref) \u00d7 224\u3001 <strong>\u4e0e IDAC \u7535\u6d41\u7edd\u5bf9\u503c\u65e0\u5173<\/strong>\u4ec5\u4e0e Rref \u6709\u5173\uff0c\u4e0d\u53d7\u7535\u6e90\u6ce2\u52a8\u7684\u5f71\u54cd\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">&nbsp;<\/td>\n<td width=\"196\">SSP1x20_REJECT_OFF<\/td>\n<td width=\"152\">\u672a\u542f\u7528 50\/60Hz \u6291\u5236\u529f\u80fd<\/td>\n<td width=\"211\">\u5982\u679c\u73af\u5883\u5e72\u6270\u8f83\u5c0f\uff0c\u53ef\u4ee5\u5173\u95ed\uff1b\u5982\u679c\u5904\u4e8e\u5de5\u9891\u73af\u5883\uff0c\u5efa\u8bae\u6253\u5f00 REJECT_50\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">&nbsp;<\/td>\n<td width=\"196\">SSP1x20_PSW_OFF<\/td>\n<td width=\"152\">\u5173\u95ed\u4f20\u611f\u5668\u7535\u6e90\u5f00\u5173<\/td>\n<td width=\"211\">PT100 \u7531 IDAC \u4f9b\u7535\uff0c\u4e0d\u9700\u8981\u989d\u5916\u7684 PSW\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">&nbsp;<\/td>\n<td width=\"196\">SSP1x20_IDAC_500uA<\/td>\n<td width=\"152\">\u8bbe\u7f6e\u6052\u6d41\u6e90\u7535\u6d41 = <strong>500 \u03bcA<\/strong><\/td>\n<td width=\"211\">\u901a\u7528\u7535\u6d41\u503c\uff0c\u5e73\u8861\u529f\u8017\u548c\u4fe1\u53f7\u5e45\u5ea6\uff08100\u03a9 \u2192 50mV\uff09\u3002<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\" width=\"158\"><strong>REG3<\/strong><br \/>\nWrite_REGTab[3]<\/td>\n<td width=\"196\">SSP1x20_IDAC1_AIN2<br \/>\n| SSP1x20_IDAC2_AIN3<br \/>\n| SSP1x20_DRDYM_DRDY<\/td>\n<td width=\"152\"><strong>IDAC \u8f93\u51fa\u5f15\u811a + DRDY \u914d\u7f6e<\/strong><\/td>\n<td width=\"211\">&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_IDAC1_AIN2<\/td>\n<td width=\"152\"><strong>IDAC1 \u8f93\u51fa\u81f3 AIN2<\/strong><\/td>\n<td width=\"211\">AIN2 \u81f3 PT100\uff08\u6fc0\u52b1\uff09<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_IDAC2_AIN3<\/td>\n<td width=\"152\"><strong>IDAC2 \u8f93\u51fa\u81f3 AIN3<\/strong><\/td>\n<td width=\"211\">AIN3 \u8fde\u63a5\u5230 R_ref \u4e00\u7aef\u7684\u57fa\u51c6\u7535\u963b\u5668\uff08\u5f62\u6210\u56de\u8def\uff09<br \/>\n\u2192 \u5b9e\u73b0 <strong>\u4e09\u7ebf\u8865\u507f <\/strong>(\u62b5\u6d88\u5bfc\u7ebf\u7535\u963b\uff09\u3002<\/td>\n<\/tr>\n<tr>\n<td width=\"196\">SSP1x20_DRDYM_DRDY<\/td>\n<td width=\"152\">\u542f\u7528 <strong>DRDY \u5f15\u811a <\/strong>(\u6570\u636e\u5c31\u7eea\u4fe1\u53f7\uff09\u3002<\/td>\n<td width=\"211\">MCU \u901a\u8fc7 GPIO \u68c0\u6d4b DRDY \u4f4e\u7535\u5e73\uff0c\u4ee5\u4e86\u89e3\u4f55\u65f6\u6b63\u5728\u8bfb\u53d6\u6570\u636e\u5e76\u907f\u514d\u8f6e\u8be2\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>----------------------------------<\/p>\n<p>\u5173\u952e\u96f6\u4ef6\u4ee3\u7801\u516c\u5f0f\u8ba1\u7b97\uff1a<\/p>\n<p>RTD = 1650*( (float)ADC_gain_value \/(0x3fffff)); \/\/\u53c2\u8003\u7535\u963b 1650 \u6b27\u59c6 tmpPt100 = (RTD-100)\/0.385\uff1b<\/p>\n<h2>\u53c2\u8003\u7535\u963b 1650 \u6b27\u59c6\u3001<\/h2>\n<h2>\u7b2c\u4e00\u884c\u4ee3\u7801 RTD = 1650 * (ADC \/ 0x3FFFFF)<\/h2>\n<h2>\u65e8\u5728\u5c06 ADC \u539f\u59cb\u503c\u8f6c\u6362\u4e3a PT100 \u7684\u7535\u963b\u503c\uff08\u6bd4\u7387\u6d4b\u91cf\uff09<\/h2>\n<ul>\n<li><strong> VIN = I \u00d7 RPT100\uff08PT100 \u4e24\u7aef\u7684\u7535\u538b\uff09<\/strong><\/li>\n<li><strong> VREF = I \u00d7 RREF\uff08\u53c2\u8003\u7535\u963b\u4e24\u7aef\u7684\u7535\u538b\uff09<\/strong><\/li>\n<\/ul>\n<p>\u4e24\u7aef\u4f7f\u7528\u76f8\u540c\u7684\u6052\u6d41\u6e90 I adc<\/p>\n<p>&nbsp;<\/p>\n<p>\u90a3\u4e48\u00a0\u00a0\u00a0\u00a0 <strong>Vin\/Vref = Rpt100\/Rref<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>ADC \u7684\u8f93\u51fa\u662f\u8fd9\u4e00\u6bd4\u7387\u7684\u6570\u5b57\u5316\u7ed3\u679c<\/strong><\/p>\n<p><strong>ADC_Code = Vin\/Vref x 2<sup>24<\/sup><\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p>\u56e0\u6b64\u88ab\u63a8\u56de<\/p>\n<p><strong>Rpt100<\/strong><strong>\u200b<\/strong><strong>= Rref x ADC_Code \/2<sup>24<\/sup><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>---------------------------------------<\/p>\n<h2>\u7b2c\u4e8c\u884c\u4ee3\u7801\uff1a tmpPt100 = (RTD - 100) \/ 0.385\uff1b<\/h2>\n<h2>\u7528\u7ebf\u6027\u8fd1\u4f3c\u516c\u5f0f\u4f30\u7b97\u6e29\u5ea6<\/h2>\n<p>0\u00b0C \u65f6\uff0cRpt100 = 100 \u03a9<\/p>\n<p>\u6e29\u5ea6\u6bcf\u5347\u9ad8 1\u00b0C\uff0c\u7535\u963b\u589e\u52a0\u7ea6 0.385 \u03a9\u3002<\/p>\n<p>\u90a3\u4e48<\/p>\n<p>&nbsp;<\/p>\n<p><strong>T <\/strong><strong>\u2248<\/strong><strong> (R-100)\/0.385<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<h3>\u2165\u3001\u5e38\u89c1\u95ee\u9898\u8c03\u8bd5\u6307\u5357<\/h3>\n<table>\n<thead>\n<tr>\n<td width=\"158\"><strong>\u5f02\u5e38<\/strong><\/td>\n<td><strong>\u53ef\u80fd\u7684\u539f\u56e0<\/strong><\/td>\n<td><strong>\u6545\u969c\u6392\u9664\u6b65\u9aa4<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"158\">ADC \u7684\u539f\u59cb\u503c\uff08\u539f\u59cb\u503c\uff09\u4e3a\u8d1f\u503c<\/td>\n<td>AIN0 \u4e0e AIN1 \u914d\u7f6e\u76f8\u53cd<\/td>\n<td>1.\u68c0\u67e5\u8f6f\u4ef6\u914d\u7f6e\u662f\u5426\u4e0e\u786c\u4ef6\u8fde\u63a5\u4e00\u81f4<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">r_pt100 &gt; 1400\u03c9<\/td>\n<td>1.IDAC \u7535\u6d41\u914d\u7f6e\u4e0d\u6b63\u786e\uff1b 2. Rref \u6253\u5f00<\/td>\n<td>1.\u68c0\u67e5 REG2 \u7684 IDAC \u914d\u7f6e\uff08\u786e\u4fdd\u4e3a 500\u03bcA\uff09\uff1b 2. \u7528\u4e07\u7528\u8868\u6d4b\u91cf R ref \u7535\u963b\u503c\uff0c\u786e\u8ba4\u7535\u8def\u672a\u5f00\u8def<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">\u6e29\u5ea6\u503c\u4e3a - 999\u00b0C<\/td>\n<td>PT100 \u8d85\u8fc7 18\u03a9~330\u03a9 \u8303\u56f4<\/td>\n<td>1.\u68c0\u67e5 PT100 \u662f\u5426\u65ad\u5f00\uff08\u6d4b\u91cf PT100 \u7535\u963b\uff09\uff1b 2. \u9a8c\u8bc1 SPI \u901a\u4fe1\uff08\u8bfb\u53d6\u5bc4\u5b58\u5668\u914d\u7f6e\u503c\uff09<\/td>\n<\/tr>\n<tr>\n<td width=\"158\">\u6e29\u5ea6\u6ce2\u52a8 &gt; 0.1\u00b0C<\/td>\n<td>1.\u7535\u6e90\u7eb9\u6ce2\u5927\uff1b 2. \u7535\u78c1\u5e72\u6270<\/td>\n<td>1.\u6d4b\u91cf SSP1220 VDD \u7eb9\u6ce2\uff08\u8981\u6c42 \u2264 10mV\uff09\uff1b 2.\u68c0\u67e5\u5c4f\u853d\u7ebf\u7684\u63a5\u5730\u60c5\u51b5\uff0c\u4ee5\u907f\u514d\u5e72\u6270<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u2166\u3001 SSP1220 \u6838\u5fc3\u5bc4\u5b58\u5668\u914d\u7f6e\u8868<\/h3>\n<table>\n<thead>\n<tr>\n<td width=\"72\">\u6ce8\u518c<\/td>\n<td width=\"130\">\u914d\u7f6e\u9879\u76ee<\/td>\n<td width=\"149\">\u503c\uff08\u5916\u90e8\u6e29\u5ea6\u6d4b\u91cf\uff09<\/td>\n<td width=\"191\">\u529f\u80fd\u8bf4\u660e<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td rowspan=\"3\" width=\"72\">REG0<\/td>\n<td width=\"130\">\u5dee\u5206\u901a\u9053<\/td>\n<td width=\"149\">AIN1-AIN0<\/td>\n<td width=\"191\">\u5339\u914d PT100 \u7684\u63a5\u7ebf\uff0c\u907f\u514d\u51fa\u73b0\u8d1f\u7684\u539f\u59cb\u63a5\u7ebf<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">\u6536\u83b7<\/td>\n<td width=\"149\">1\u00d7<\/td>\n<td width=\"191\">\u907f\u514d\u4fe1\u53f7\u9971\u548c\uff0c\u9002\u5e94\u6bd4\u7387\u6d4b\u91cf<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">PGA \u65c1\u8def<\/td>\n<td width=\"149\">\u5173\u95ed<\/td>\n<td width=\"191\">\u4fdd\u6301\u4fe1\u53f7\u8def\u5f84\u5b8c\u6574\u6027<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\" width=\"72\">REG1<\/td>\n<td width=\"130\">\u91c7\u6837\u7387<\/td>\n<td width=\"149\">20SPS<\/td>\n<td width=\"191\">\u4f4e\u901f\u53ef\u63d0\u9ad8\u7cbe\u5ea6\u5e76\u9002\u5e94\u7f13\u6162\u7684\u6e29\u5ea6\u4fe1\u53f7<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">\u5de5\u4f5c\u6a21\u5f0f<\/td>\n<td width=\"149\">\u6b63\u5e38\u6a21\u5f0f<\/td>\n<td width=\"191\">\u8fde\u7eed\u8f6c\u6362\u548c\u5b9e\u65f6\u8f93\u51fa\u6e29\u5ea6\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">\u81ea\u52a8\u6821\u51c6<\/td>\n<td width=\"149\">\u4ee5\u4fbf<\/td>\n<td width=\"191\">\u6d88\u9664\u504f\u79fb\/\u589e\u76ca\u8bef\u5dee\uff0c\u63d0\u9ad8\u7cbe\u5ea6<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">\u5185\u90e8 TS<\/td>\n<td width=\"149\">\u5173\u95ed<\/td>\n<td width=\"191\">\u5916\u90e8\u6e29\u5ea6\u6d4b\u91cf\u4e0d\u9700\u8981\u5185\u90e8\u4f20\u611f\u5668<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"72\">\u00a0REG2<\/td>\n<td width=\"130\">\u53c2\u8003\u7535\u538b<\/td>\n<td width=\"149\">\u5916\u90e8 REF0<\/td>\n<td width=\"191\">\u57fa\u4e8e\u6bd4\u7387\u7684\u6d4b\u91cf\u53ef\u62b5\u6d88 IDAC \u7535\u6d41\u6ce2\u52a8<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">IDAC \u7535\u6d41<\/td>\n<td width=\"149\">500\u03bcA<\/td>\n<td width=\"191\">\u5e73\u8861\u529f\u8017\u548c\u4fe1\u53f7\u5e45\u5ea6\uff0850mV 100\u03a9\uff09<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"72\">REG3<\/td>\n<td width=\"130\">IDAC1 \u8def\u7ebf<\/td>\n<td width=\"149\">AIN2<\/td>\n<td width=\"191\">\u52b1\u78c1\u7535\u6d41\u8f93\u5165 PT100<\/td>\n<\/tr>\n<tr>\n<td width=\"130\">IDAC2 \u8def\u7531<\/td>\n<td width=\"149\">AIN3<\/td>\n<td width=\"191\">\u62b5\u6d88\u5f15\u7ebf\u7535\u963b R7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u2167\u3001\u5361\u4f26\u8fbe-\u8303\u675c\u68ee\u65b9\u7a0b\u7cfb\u6570\u8868<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"138\">\u7cfb\u6570<\/td>\n<td width=\"139\">\u6570\u503c<\/td>\n<td width=\"110\">\u5355\u4f4d<\/td>\n<td width=\"166\">\u9002\u7528\u8303\u56f4<\/td>\n<\/tr>\n<tr>\n<td width=\"138\">R0<\/td>\n<td width=\"139\">100.0<\/td>\n<td width=\"110\">\u03a9<\/td>\n<td width=\"166\">0\u00b0C \u57fa\u51c6\u7535\u963b<\/td>\n<\/tr>\n<tr>\n<td width=\"138\">A<\/td>\n<td width=\"139\">3.9083\u00d710<sup>-3<\/sup><\/td>\n<td width=\"110\">\u2103<sup>-1<\/sup><\/td>\n<td width=\"166\">-200\u2103~600\u2103<\/td>\n<\/tr>\n<tr>\n<td width=\"138\">B<\/td>\n<td width=\"139\">-5.775\u00d710<sup>-7<\/sup><\/td>\n<td width=\"110\">\u2103<sup>-2<\/sup><\/td>\n<td width=\"166\">-200\u2103~600\u2103<\/td>\n<\/tr>\n<tr>\n<td width=\"138\">C<\/td>\n<td width=\"139\">-4.183\u00d710<sup>-12<\/sup><\/td>\n<td width=\"110\">\u2103<sup>-4<\/sup><\/td>\n<td width=\"166\">-200\u2103~0\u2103<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u5982\u9700\u5b8c\u6574\u4ee3\u7801\uff0c\u8bf7\u8054\u7cfb\u6211\u4eec\u7684\u6280\u672f\u652f\u6301\u3002\u8054\u7cfb\u65b9\u5f0f\uff1a1801420372718014203727<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>SSP1220 \u4e09\u7ebf\u70ed\u7535\u963b\u6d4b\u91cf\u4eea<\/p>","protected":false},"author":9,"featured_media":3001,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[62],"tags":[331,330],"acf":[],"_links":{"self":[{"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/posts\/2991"}],"collection":[{"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/comments?post=2991"}],"version-history":[{"count":0,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/posts\/2991\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/media\/3001"}],"wp:attachment":[{"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/media?parent=2991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/categories?post=2991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.siproin-ic.com\/zh\/wp-json\/wp\/v2\/tags?post=2991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}