RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems
TIDA-00095
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Key Document

Description

This comprehensive design provides a complete system that measures and processes temperature signals  inputs from 2-wire, 3-wire, and 4-wire resistance temperature detectors (RTDs) and outputs a 4 to 20-mA current-loop signal corresponding to the temperature processed from the RTD inputs. It is intended as a reference design for process measurement applications in factory automation, field transmitters and building automation. With less than 0.17°C maximum measured error over -200°C to 850°C, extremely low loop power consumption 1.4mA  (typical including RTD biasing currents) and IEC61000 pre compliance testing, this design significantly reduces the design time for development of high accuracy temperature transmitter systems. It also addresses system level calibration - both offset and gain that can be implemented to improve ADC and DAC accuracy as well as also includes linear interpolation to address the non-linearity of the RTD element.

Features
  • Input Compatible with 2-, 3-, and 4-wire RTD Probes
  • Low power consumption  of 1.4 mA (with RTD biasing currents) makes it ideal for loop powered systems
  • 4-20 mA current-loop signal output with 0.25 µA resolution
  • Maximum measured error: 0.11°C (-200°C to 200°C), 0.17°C (-200°C to 850°C)
  • IEC61000-4-2: ESD: Air Discharge: ±8 kV Class A, Contact Discharge ±4 kV Class A
  • IEC61000-4-4: EFT: ±2 kV Class A

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1120  16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS1220  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
DAC161S997  16-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430G2513  16 MHz MCU with 16 KB Flash, 512 Byte RAM, 24 IO, 2 16-bit Timers and comparator  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  Wide VIN, 150-mA, ultra-low-noise, high-PSRR low-dropout (LDO) linear regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1120 Download Download
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ADS1220 Download Download
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DAC161S997 Download
MSP430G2513 Download
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TPS7A49 Download Download
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Technical Documents

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Application notes (1)
Title Type Size (KB) Date
PDF 647 26 Apr 2016
User guides (1)
Title Type Size (KB) Date
PDF 5991 11 Feb 2014
Design files (7)
Title Type Size (KB) Date
PDF 274 29 Jan 2014
PDF 257 29 Jan 2014
PDF 1492 29 Jan 2014
ZIP 2301 29 Jan 2014
ZIP 765 29 Jan 2014
ZIP 23 29 Jan 2014
PDF 212 29 Jan 2014
Related Tools & Software

Reference Designs  ( 5 )

Software (1)



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