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| LTC2983多传感器高精度数字温度测量系统方案 |
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| 文章来源： 更新时间：2015/1/20 11:27:00 |
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Linear公司的LTC2983能测量各种温度传感器并以数字输出,分辨率0.001℃,精度0.1℃,可以测量2/3/4线RTD,温度调节器和二极管.器件包括20个可配置的模拟输入端,激励电流源和对每种传感器的故障检测电路.工作电压2.85V-5.25V,主要用在热电偶,RTD和温度调节器的温度直接测量,以及专用传感器应用.本文介绍了LTC2983主要特性,框图,典型应用电路,以及包括LTC2983入门板,主板(DC2209),20输入分接板(DC2210)和Linduino One (DC2026)的温度测量系统DC2296A特性,电路图和材料清单.
The LTC?2983 measures a wide variety of temperature sensors and digitally outputs the result, in ℃ or °F, with 0.1℃ accuracy and 0.001℃ resolution. The LTC2983 can measure the temperature of virtually all standard (type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate for cold junction temperatures and linearize the results. The device can also measure temperature with standard 2-, 3-, or 4-wire RTDs, thermistors, and diodes.
It has 20 reconfigurable analog inputs enabling many sensor connections and configuration options. The LTC2983 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor.
The LTC2983 allows direct interfacing to ground referenced sensors without the need for level shifters, negative supply voltages, or external amplifiers. All signals are buffered and simultaneously digitized with three high accuracy, 24-bit ΔΣ ADC’s, driven by an internal 10ppm/℃ (maximum) reference.
LTC2983主要特性:
Directly Digitize RTDs, Thermocouples, Thermistors, =and Diodes
Single 2.85V to 5.25V Supply
Results Reported in ℃ or °F
20 Flexible Inputs Allow Interchanging Sensors
Automatic Thermocouple Cold Junction Compensation
Built-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and Thermistors
Configurable 2-, 3-, or 4-Wire RTD Configurations
Measures Negative Thermocouple Voltages
Automatic Burn Out, Short-Circuit and Fault Detection
Buffered Inputs Allow External Protection
Simultaneous 50Hz/60Hz Rejection
Includes 10ppm/℃ (max) Reference (I-Grade)
LTC2983应用:
Direct Thermocouple Measurements
Direct RTD Measurements
Direct Thermistor Measurements
Custom Sensor Applications
图1. LTC2983框图
图2. LTC2983带自动冷端补偿的热电偶测量电路图
图3. LTC2983典型RTD/电热调节器应用电路图
图4. LTC2983通用输入共享热电偶,二极管, 电热调节器,三线RTD和4线RTD应用电路图
温度测量系统DC2296A包括LTC2983入门板,主板(DC2209),20输入分接板(DC2210)和Linduino One (DC2026)
The DC2296 is the starter kit for demonstrating the performance and ease of use of the LTC®2983, which is a complete temperature measurement system on a chip.
This kit includes the DC2209 (main demo circuit containing the LTC2983) 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.
• Universal Temperature Measurement Board – DC2211
• Thermocouple Board – DC2212
• Dedicated RTD Board – DC2213
• Dedicated Thermistor Board – DC2214
The DC2209 is a member of the QuikEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2983 and may be connected to any one of the sensor daughter boards.
These daughter boards allow evaluation of the various LTC2983 sensor types (see Figure 1).For the serial digital interface, the DC2209 may be connected to the DC2026 Linduino™ One.
图5. 温度测量系统DC2296A外形图
The DC2296 is the starter kit for demonstrating the performance and ease of use of the LTC®2983, which is a complete temperature measurement system on a chip. This kit includes the DC2209 (main demo circuit containing the LTC2983) 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6.DC2209温度测量板外形图
图7.DC2210实验板外形图
图8.DC2210实验板电路图
图9.DC2211通用温度测量板外形图
图10.DC2211通用温度测量板电路图
图11.DC2212热电偶子板外形图
图12.DC2212热电偶子板电路图
图13.DC2213专用RTD板外形图
图14.DC2213专用RTD板电路图
图15.DC2213热电偶子板外形图
图16.DC2214专用电热调节器板电路图
图17. 温度测量系统DC2296A电路图
温度测量系统DC2296A材料清单:
Linear Technology’s DC2026 (called the Linduino™ One) is compatible with the Arduino Uno microcontroller board. Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick in-circuit firmware updates. The software is a simple programming environment based on the AVRGCC compiler. This platform is popular because it is easy to use, both the hardware and software are open source, and it can be programmed in C. We find it an ideal way to demonstrate and distribute libraries for integrated circuits that have digital interfaces such as Inter-Integrated Circuit (I2C) and Serial Peripheral Interface (SPI). While the Linduino One is Arduino-compatible, it is not produced by the official Arduino team, and they do not receive any monetary support from this board.
图18. Linduino™ One板连接图
图19. Linduino™ One板框图
图20. Linduino™ One板电路图(1)
图21. Linduino™ One板电路图(2)
Linduino™ One板材料清单:
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