使用STM32和AD5420输出4-20mA的电路和程序

最新推荐文章于 2025-05-13 01:49:23 发布

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最新推荐文章于 2025-05-13 01:49:23 发布 · 9.3k 阅读

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#AD5420 #STM32 #4-20mA

本文介绍了如何使用STM32F103C8T6和AD5420芯片设计4-20mA输出的电路，并详细说明了将官方4-20mA示例程序改编为0-24mA输出的过程。通过Fluke 15B万用表测试，得到的误差在0.3%，符合预期。

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最近在做一个4-20mA输出的项目，遇到一些问题，但是还好顺利解决，使用STM32F103C8T6和AD5420，下面是电路图：

AD5420电路参考datasheet和CN0270，www.analog.com/CN0270.

通讯使用的是官方示例程序移植，官方为4-20mA，我这项目为了有其他模式所以改为0-24mA输出。

程序如下：

头文件如下：
#ifndef __AD5420_IO_H
#define __AD5420_IO_H

//#include "include.h"
//#include "sys.h"
/*----------------------------------------------------------------------
  File Name          : AD5420_IO.h 
  Author             : Neil Zhao - CAST
  Version            : V1.0
  Date               : 1/8/2009
  Description        : AD5420 Driver Declaration

  The AD5410/AD5420 are low-cost, precision, fully integrated
  12/16-bit converter offering a programmable current source
  output designed to meet the requirements of industrial process
  control applications.

  China Applications Support Team.
  china.support@analog.com

----------------------------------------------------------------------

  The present firmware which is for guidance only aims at providing
  customers with coding information regarding their products in order
  for them to save time.  As a result, Analog Devices shall not be
  held liable for any direct, indirect or consequential damages with
  respect to any claims arising from the content of such firmware and/or