TIDA-00247
單晶片雙線迴路供電 4 至 20mA 電流迴路 RTD 溫度發送器參考設計
TIDA-00247
概覽
In general, for portable 2-wire 4 to 20mA current loop applications, the system power consumption needs to be considered carefully. The conventional approach of using a high bridge excitation voltage and an operational amplifier to achieve a full-scale ADC input voltage increases chip count and overall power consumption. An additional external voltage regulator is also needed to excite the bridge sensor and supply the microcontroller from the same voltage source. Since the goal for this reference design is to maintain low power consumption and low cost solution. This solution utilizes the integrated ADC and operational amplifiers (OAs) of a microcontroller. In order to cut down the cost, the ADC/DAC use the main supply voltage as its reference voltage instead of including an external reference or selecting a more expensive ADC/DAC that features an internal reference. Leveraging the integrated peripherals of MCU enables low component count and low cost. This reference design is based on a mixed signal microcontroller, specifically an MSP430F2274.
特點
- Analog functionality fully integrated into microcontroller
- Sensor input compatible with 2-wire PT100 RTD probe only
- Temperature range for RTD -200°C to +850°C
- Input power supply range: 10V to 33V DC
- 4 to 20mA current loop output signal
- Maximum measured error: better than ±2.5ºC
- Implements ratiometric measurement
- Design to meet IEC 61000-4 requirement
- Operating temperature range -40°C to +85°C
工業
- Capacitive pressure transmitter
- Capacitive pressure transmitter
- Coriolis Flow Transmitter
- Coriolis Flow Transmitter
- Hydrometric Pressure Level Transmitter
- Hydrometric Pressure Level Transmitter
- Inductive & capacitive position sensor
- LVDT Position Sensor
- LVDT 壓力傳送器
- LVDT 壓力傳送器
- Proximity switch
- Proximity switch
- Ultrasonic flow transmitter
- Ultrasonic flow transmitter
- Ultrasonic position sensor
- Unit controller
- Vortex flow transmitter
- Vortex flow transmitter
- 光學 ToF 脈衝位置感測器
- 光學 ToF 連續波位置感測器
- 壓差流量傳送器
- 壓差流量傳送器
- 溫度傳送器
- 溫度傳送器
- 熱質量流量傳送器
- 熱質量流量傳送器
- 熱質量流量傳送器
- 矽壓傳送器
- 矽壓傳送器
- 葉輪/渦輪流量傳送器
- 葉輪/渦輪流量傳送器
- 超音波位準發送器
- 超音波位準發送器
- 雷達/微波位準發送器
- 雷達/微波位準發送器
- 電容位準發送器
- 電容位準發送器
- 電磁 (MID) 流量傳送器
- 電磁 (MID) 流量傳送器
- 電阻壓力傳送器
- 電阻壓力傳送器
已開發完全組裝的電路板，僅供測試與性能驗證，且為非賣品。
設計檔案與產品
設計檔案
下載立即可用的系統檔案以加速您的設計流程。
產品
設計與潛在替代方案中包括 TI 產品。
MSP430F2274 — 具有 32KB 快閃記憶體、1KB SRAM、10 位元 ADC、2 運算放大器、I2C/SPI/UART 的 16 MHz MCU
技術文件
| 類型 | 標題 | 下載最新的英文版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 設計指南 | Temperature Transmitter on Single Chip Mixed-Signal MCU (Rev. A) | 2015/1/30 | |||
| 技術文章 | Leveraging MSP430™ FRAM MCUs with integrated configurable analog in modern-day fac | PDF | HTML | 2019/8/30 |