原标题：Linear LTC2986多传感器高精度数字温度测量系统解决方案

　　Linear公司的LTC2986是带EEPROM的多传感器高精度数字温度测量系统,℃或 °F数字输出,精度为0.1℃,分辨率为0.001℃,单电源2.85V - 5.25V工作,具有热电偶冷端自动补偿,10个灵活的模拟输入端,主要用在热电偶直接测量,RTD直接测量,温度调节器测量和定制的传感器测量.本文介绍了LTCR2986-1主要特性,框图和应用电路,DC2531数字温度测量系统包括DC2211通用温度测量板电路图,DC2212热电偶板电路图,DC2213专用RTD板电路图和DC2214专用电热调节器板电路图,以及材料清单.

　　The LTCR2986 measures a wide variety of temperaturesensors and digitally outputs the result, in ℃ or °F, with0.1℃ accuracy and 0.001℃ resolution. The LTC2986 canmeasure the temperature of virtually all standard (Type B,E, J, K, N, S, R, T) or custom thermocouples, automaticallycompensate for cold junction temperatures and linearizethe results. The device can also measure temperaturewith standard 2-, 3-, or 4-wire RTDs, thermistors, anddiodes. The LTC2986 includes excitation current sourcesand fault detection circuitry appropriate for each type oftemperature sensor.

　　The LTC2986/LTC2986-1 are 10-channel software and pincompatibleversions of the 20-channel LTC2983/LTC2984.Additional features include special modes that enable easyprotection in universal multi-sensor applications, customtables for generic ADC readings, and direct temperaturereadout from active analog temperature sensors. The　LTC2986-1 is the EEPROM version of the LTC2986.

　　LTCR2986-1主要特性:

　　nnDirectly Digitizes 2-, 3-, or 4-Wire RTDs,Thermocouples, Thermistors, and Diodes

　　nnOn-Chip EEPROM (LTC2986-1) Stores ChannelConfiguration Data and Custom Coefficients

　　nnSingle 2.85V to 5.25V Supply

　　nn10 Flexible Inputs Allow Interchanging Sensors

　　nnAutomatic Thermocouple Cold Junction Compensation

　　nnBuilt-In Standard and User-Programmable Coefficientsfor Thermocouples, RTDs and Thermistors

　　nnMeasures Negative Thermocouple Voltages

　　nnAutomatic Burn Out, Short-Circuit and Fault Detection

　　nnBuffered Inputs Allow External Protection

　　nnSimultaneous 50Hz/60Hz Rejection

　　nnIncludes 15ppm/°C (Max) Reference

　　nnIncludes Special Protection Modes

　　LTCR2986-1应用:

　　nnDirect Thermocouple Measurements

　　nnDirect RTD Measurements

　　nnDirect Thermistor Measurements

　　nnCustom Sensor Applications

　　图1.LTCR2986-1框图

　　图2.LTCR2986-1冷端自动补偿的热电偶测量电路图

　　DC2531数字温度测量系统

　　The DC2531 is the starter kit for demonstrating the performanceand ease of use of the LTC®2986, which is acomplete temperature measurement system on a chip.

　　This kit includes the DC2508 (main demo circuit containingthe LTC2986) and the DC2210 (a simple experimentcircuit allowing bread boarding). In addition to the starter demonstration kit, sensor specific demonstration boardshighlighting the performance of RTDs, thermistors, orthermocouples are also available.

　　• Universal Temperature Measurement Board – DC2211

　　• Thermocouple Board – DC2212

　　• Dedicated RTD Board – DC2213

　　• Dedicated Thermistor Board – DC2214

　　The DC2508 is a member of the QuikEval™ family of demonstrationboards. It is designed to allow easy evaluationof the LTC2986 and may be connected to any one of thesensor daughter boards.

　　These daughter boards allow evaluation of the variousLTC2986 sensor types.

　　For the serial digital interface, the DC2508 may be connectedto the DC2026 Linduino™ One.

　　图2.DC2508温度测量演示板

　　The DC2531 is the starter kit for demonstrating the performance and ease of use of the LTC2986, which is a complete temperature measurement system on a chip. This kit includes the DC2508 (main demo circuit containing the LTC2986) and the DC2210 (a simple experiment circuit allowing bread boarding). In addition to the starter demonstration kit, sensor specific demonstration boards highlighting the performance of RTDs, thermistors, or thermocouples are also available.

　　图3.DC2531数字温度测量系统图

　　图4.DC2211通用温度测量板电路图

　　图5.DC2212热电偶板电路图

　　图6.DC2213专用RTD板电路图

　　图7.DC2214专用电热调节器板电路图

　　材料清单: