[原创] 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 ..

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