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多通道、通用模拟输入 参考设计
2017年4月5日
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作者:Frank Gao Maxim Integrated 资深应用工程师 |
通用模拟输入是工厂自动化普遍使用的单元电路,灵活测量模拟电压/电流信号以及RTD、TC成为组装过程中不可或缺的功能。工业4.0在工业结构、分布试管理、智能化控制方面带来了巨大变化,其高度 可配置性、高度模块化整合,使得传感器输入量剧增。如何在超小尺寸的PLC模块内构建通用的模拟 信号和温度测量成为工业4.0的关键。为满足工业客户的这一需求,我们以Maxim的高精度ADC为核 心,分别设计了多通道的通用电压/电流输入和RTD、TC输入参考设计,以帮助用户快速实现产品升级。
MAXREFDES147#:4通道通用温度测量(TC&RTD)方案
MAXREFDES147#是Maxim通用模拟输入板卡之一,四个通道可 分别配置成RTD (阻值小于4kΩ)、热电偶输入,提供电源和数据 隔离。整个板卡尺寸为5.1cm x 9.1cm,板上安装了STM32微处 理器和模拟前端,低功耗、24位ADC MAX11410实现精确的传感 器测温。系统典型功耗低于300mW,适合任何高精度温度测量应 用。电路原理框图如图1所示。

关键特性
- 高精度:PT100小于0.1°C
- 低功耗模拟前端
- 电源与数据隔离
- 4通道输入,每通道可独立配置为RTD或TC输入
- RTD支持2线或3线连接
- TC采用外部PT100/PT1000作为冷端补偿
- 支持传感器开路检测
- 传感器输入提供高达30V输入保护
- 系统校准,校准数据保存在Flash
- 提供驱动和C程序代码
典型应用
- 工业控制与自动化
- 过程控制
- PLC
MAXREFDES147#测量误差@25°C (PT100/PT1000)
表1. MAXREFDES147#供电需求
电源类型 | 输入电压(V) | 输入电流(mA, 典型值) |
---|---|---|
板上隔离电源 | 24 | 20 |
注:STM32和FTDI由USB供电
固件可执行校准和采样指令,并通过虚拟COM口批量读取采样数 据。提供完整的源程序,帮助用户加快设计进程。并可基于当前 设计进行修改,以满足用户新的设计需求。
图2. MAXREFDES147#输入配置
MAXREFDES146#:4通道、通用模拟电压/电流输入
MAXREFDES146#支持4路模拟电压(0-10V)、模拟电流(0-20mA) 输入,以及2线、3线、4线制传感器测量。提供电源和数据 (2.75kVRMS)隔离。板卡模拟前端由超摆幅模拟开关、精密运放 以及24位ADC (MAX11270)组成,通过STM32F1微控制器实现电 压/电流及传感器输入配制与切换、采样及数据收集。ADC采样数 据存储在内部SRAM,用户通过终端程序读取采样数据或执行系 统校准,并可利用第三方软件进行数据分析。所有控制信号通过 MAX7317 SPI-GPIO扩展器发送,MAX7317与MAX11270 ADC共 用SPI接口。整块板卡尺寸为5cmx10.6cm,功耗低于500mW。适 用于工业PLC等任何高精度测量应用。原理框图如图3、图4所示。
图3. MAXREFDES146#原理框图
图4. MAXREFDES146#模拟通道框图
关键特性
- 高精度(参见误差测试曲线)
- 0至+10V电压输入
- 0至20mA电流输入
- 4通道输入,每通道可分别配置成电压或电流输入
- 数字控制模拟开关
- 24V输入保护
- 电源和数据隔离
- 系统校准,校准数据保存在Flash
- 连接器提供24V输出,并可使能或关闭24V输出
- 提供驱动和C程序代码
典型应用
- 工业控制与自动化
- 过程控制
- PLC
表2. MAXREFDES146#供电需求
电源类型 | 输入电压(V) | 输入电流(mA, 典型值) |
---|---|---|
板上隔离电源 | 24 | 20 |
注:STM32和FTDI由USB供电
图5. MAXREFDES146#输入配置
MAXREFDES146#电压测量误差曲线,FLUKE 725S输出0V—10V电压@25°C
MAXREFDES146#电流测量误差曲线,FLUKE 725S输出0mA—20mA@25°C
如需详细的设计资料,请访问www.maximintegrated.com/cn/support, 或致电技术支持热线:
中国大陆北部:10800 852 1249;
中国大陆南部:10800 152 1249;
中国大陆全区:400 120 6263