MAXIM MAX31850 冷端补偿one wire总线热电偶数字转换参考设计方案
MAXIM公司的MAX31850是一款冷端补偿one wire 总线热电偶数字信号转换器芯片，转换分辨率高达0.25℃，允许最高读出1768℃、最低读出-270℃。在-200℃至700℃的热电偶精度可达到2℃。该芯片通过one wire总线将数据传送至微控制器中，one wire总线可以支持最多16个外部MAX31850芯片，以实现对多点数据的采集。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.
Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line (“parasite power”), eliminating the need for an external power supply.
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