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基于Maxim公司的MAX31865高精度温度传感器参考设计

来源: 中电网
2019-01-15
类别:工业控制
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文章创建人 拍明

原标题:Maxim MAX31865高精度温度传感器参考设计

  Maxim公司的MAX31865是电阻/数字转换器,温度分辨率0.03125NC,总测量精度0.5NC(满刻度的0.05%),和2/3/4线传感器连接兼容,SPI兼容接口,主要用在工业设备,医用设备和仪表.本文介绍了MAX31865主要优势和特性,框图和应用电路,以及高精度温度传感器参考设计MAXREFDES42#主要特性,电路图,材料清单和PCB设计文件图.

  The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865’s inputs are protected against overvoltage faults as large as Q45V. Programmable detection of RTD and cable open and short conditions is included.

  MAX31865主要优势和特性:

  Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time Simple Conversion of Platinum RTD Resistance to Digital Value

  Handles 100Ω to 1kΩ (at 0℃) Platinum RTDs (PT100 to PT1000)

  Compatible with 2-, 3-, and 4-Wire Sensor Connections

  SPI-Compatible Interface

  20-Pin TQFN and SSOP Packages

  High Accuracy Facilitates Meeting Error Budgets 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlin­earity)

  Total Accuracy Over All Operating Conditions: 0.5NC (0.05% of Full Scale) max

  Fully Differential VREF Inputs

  21ms (max) Conversion Time

  Integrated Fault Detection Increases System Reliability ±45V Input Protection

  Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage,or Short Across RTD Element)

  MAX31865应用:

  Industrial Equipment

  Medical Equipment

  Instrumentation

  图1.MAX31865框图

  图2.MAX31865应用电路

  高精度温度传感器参考设计MAXREFDES42#

  The MAXREFDES42# is a high-accuracy IO-Link® resistance temperature detector (RTD) temperature sensor reference design for use with a 2-wire, 3-wire, or 4-wire PT100 RTD over a wide temperature range. Built in an industrial form factor, the design makes use of Maxim Integrated’s highly integrated MAX31865 RTD-to-digital converter. A rugged, on-board female M12 connector allows off-the-shelf RTDs to be connected to the board using a standard M12 extension cable. The temp sensor performs accurate temperature conversions to 15-bit resolution with multiple fault detection features. A display shows coarse temperatures rounded to the nearest ℃, while the IO-Link communication tracks and provides fine temperature values. This sensor utilizes IQ2 Development’s IO-Link device stack to communicate to any IO-Link version 1.1-compliant master. By utilizing an industrial DC-DC step-down converter, this reference design consumes minimal power. The board also contains a male M12 connector for connection to a compliant IO-Link master using a standard M12 cable. Connecting the MAXREFDES42# to a USB IO-link master such as the IQ2 Development iqInterface® IO-Link master, using their iqTool® software, allows for evaluation with a PC.

  Refer to the Details tab for more information and lab measurement data. Design files and firmware can be downloaded from the Design Resources tab.

  图3.MAXREFDES42#外形图

  MAXREFDES42#主要特性:

  IEC 61131-9

  IQ2 IO-Link iqStack® device

  IO-Link version 1.1 compliant

  Nonvolatile memory for calibration

  Fault monitoring

  LED display for quick bring up (coarse temp values)

  IO-Link for fine temp values*

  Competitive Advantages

  High accuracy

  Low power

  Low cost

  MAXREFDES42#应用:

  Food processing

  Chemical processing

  Textile production

  Air, gas, and liquid temperature measurement

  MAXREFDES42#材料清单:



责任编辑:HanFeng

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