STM32中 A/D变换怎样把4-20mA，0-10V输入转换成0-3.3V输入

\u5982\u4f55\u628a4-20mA, 0-10V\u8f93\u5165\u8f6c\u6362\u62100-3.3V\u8f93\u5165\uff1f

\u6211\u7684\u4e4b\u524d\u505a\u7684\u5c31\u662f\u7528\u7535\u963b\u7f51\u7edc\u5206\u538b\u548c\u628a\u7535\u6d41\u53d8\u6210\u7535\u538b\u4fe1\u53f7\u7684, \u67e5\u770b\u66f4\u591a\u7b54\u6848>>

4~20mA\u7ecf\u8fc7250\u03a9\u53d6\u6837\u7535\u963b\u5373\u53ef\u8f6c\u53d8\u4e3a1~5V\u3002
\u518d\u7528\u51cf\u6cd5\u5668\u7535\u8def\uff0c\u5c06\u8f93\u51fa\u51cf\u53bb1V\uff0c\u5373\u53ef\u5f97\u52300~4V\u3002\u5c06\u51cf\u6cd5\u5668\u7535\u8def\u7684\u589e\u76ca\u6539\u4e3a3.3/4\uff0c\u5373\u53ef\u5f97\u52300~3.3V\u7684\u8f93\u51fa\u3002
\u7535\u8def\u5982\u4e0b\u56fe\uff1a

\u4e0a\u56fe\u4e2d\uff0cui1\u63a51V\uff0cUi2\u63a51~5V\u3002R1=R2=4k\u03a9\uff0cRF=R3=3.3k\u03a9\uff0c\u8f93\u51fa\u5c31\u662f0~3.3V\u3002

4-20mA电流变电压可以使用积分电路，0-10V需要串个电阻；

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