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| LTC2983多傳感器高精度數(shù)字溫度測(cè)量系統(tǒng)方案 |
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| 文章來(lái)源： 更新時(shí)間：2015/1/20 11:27:00 |
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Linear公司的LTC2983能測(cè)量各種溫度傳感器并以數(shù)字輸出,分辨率0.001℃,精度0.1℃,可以測(cè)量2/3/4線(xiàn)RTD,溫度調(diào)節(jié)器和二極管.器件包括20個(gè)可配置的模擬輸入端,激勵(lì)電流源和對(duì)每種傳感器的故障檢測(cè)電路.工作電壓2.85V-5.25V,主要用在熱電偶,RTD和溫度調(diào)節(jié)器的溫度直接測(cè)量,以及專(zhuān)用傳感器應(yīng)用.本文介紹了LTC2983主要特性,框圖,典型應(yīng)用電路,以及包括LTC2983入門(mén)板,主板(DC2209),20輸入分接板(DC2210)和Linduino One (DC2026)的溫度測(cè)量系統(tǒng)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(yīng)用:
Direct Thermocouple Measurements
Direct RTD Measurements
Direct Thermistor Measurements
Custom Sensor Applications
圖1. LTC2983框圖
圖2. LTC2983帶自動(dòng)冷端補(bǔ)償?shù)臒犭娕紲y(cè)量電路圖
圖3. LTC2983典型RTD/電熱調(diào)節(jié)器應(yīng)用電路圖
圖4. LTC2983通用輸入共享熱電偶,二極管, 電熱調(diào)節(jié)器,三線(xiàn)RTD和4線(xiàn)RTD應(yīng)用電路圖
溫度測(cè)量系統(tǒng)DC2296A包括LTC2983入門(mén)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(cè)量系統(tǒng)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(cè)量板外形圖
圖7.DC2210實(shí)驗(yàn)板外形圖
圖8.DC2210實(shí)驗(yàn)板電路圖
圖9.DC2211通用溫度測(cè)量板外形圖
圖10.DC2211通用溫度測(cè)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(zhuān)用RTD板外形圖
圖14.DC2213專(zhuān)用RTD板電路圖
圖15.DC2213熱電偶子板外形圖
圖16.DC2214專(zhuān)用電熱調(diào)節(jié)器板電路圖
圖17. 溫度測(cè)量系統(tǒng)DC2296A電路圖
溫度測(cè)量系統(tǒng)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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