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| LTC2983多傳感器高精度數字溫度測量系統方案 |
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| 文章來源： 更新時間：2015/1/19 11:33:00 |
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Linear公司的LTC2983能測量各種溫度傳感器并以數字輸出,分辨率0.001℃,精度0.1℃,可以測量2/3/4線RTD,溫度調節器和二極管.器件包括20個可配置的模擬輸入端,激勵電流源和對每種傳感器的故障檢測電路.工作電壓2.85V-5.25V,主要用在熱電偶,RTD和溫度調節器的溫度直接測量,以及專用傳感器應用.本文介紹了LTC2983主要特性,框圖,典型應用電路,以及包括LTC2983入門板,主板(DC2209),20輸入分接板(DC2210)和Linduino One (DC2026)的溫度測量系統DC2296A特性,電路圖和材料清單.
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應用:
Direct Thermocouple Measurements
Direct RTD Measurements
Direct Thermistor Measurements
Custom Sensor Applications
圖1. LTC2983框圖
圖2. LTC2983帶自動冷端補償的熱電偶測量電路圖
圖3. LTC2983典型RTD/電熱調節器應用電路圖
圖4. LTC2983通用輸入共享熱電偶,二極管, 電熱調節器,三線RTD和4線RTD應用電路圖
溫度測量系統DC2296A包括LTC2983入門板,主板(DC2209),20輸入分接板(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.
圖5. 溫度測量系統DC2296A外形圖
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.
圖6.DC2209溫度測量板外形圖
圖7.DC2210實驗板外形圖
圖8.DC2210實驗板電路圖
圖9.DC2211通用溫度測量板外形圖
圖10.DC2211通用溫度測量板電路圖
圖11.DC2212熱電偶子板外形圖
圖12.DC2212熱電偶子板電路圖
圖13.DC2213專用RTD板外形圖
圖14.DC2213專用RTD板電路圖
圖15.DC2213熱電偶子板外形圖
圖16.DC2214專用電熱調節器板電路圖
圖17. 溫度測量系統DC2296A電路圖
溫度測量系統DC2296A材料清單:
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.
圖18. Linduino™ One板連接圖
圖19. Linduino™ One板框圖
圖20. Linduino™ One板電路圖(1)
圖21. Linduino™ One板電路圖(2)
Linduino™ One板材料清單:
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