4- to 20-mA Loop-Powered RTD Temperature Transmitter Reference Design With MSP430 Smart Analog Combo

(ACTIVE) TIDM-01000

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Key Document

Description

This TI reference design provides a low-component count, low-cost solution for 4- to 20-mA loop-powered, resistance-temperature detector (RTD), temperature transmitter. The design takes advantage of the on-chip Smart Analog Combo module in the MSP430FR2355 MCU to control the loop current, so  the standalone DAC is no longer required. This design achieves a 12-bit output resolution with an output current resolution of 6 µA. The design incorporates reverse-polarity protection as well as IEC61000-4-2 and IEC61000-4-4 protection on the loop-power input.

Features
  • Sensor Input Compatible with 2-, 3- or 4-Wire Resistance Temperature Detector (RTD) Probes
  • Temperature range for RTD of –200°C to 850°C
  • Maximum Measured Error: <1°C
  • IEC61000-4-2: ESD: Air Discharge: ±8 kV Class A
  • Small Form Factor (L × W): 60mm × 8mm
  • Operating Temperature Range -40°C to 105°C

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Schematic/Block Diagram

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Design Guide

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Bill of Materials (BOM)

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1120  16-Bit 2kSPS 4-Ch Low-Power Delta-Sigma ADC With PGA and VREF for Small Signal Sensors  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR2353  24MHz 105C ULP Microcontroller With 16 KB FRAM, 2 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA  MSP430 ultra-low-power MCUs  Not Available View Design Kits & Evaluation Modules
MSP430FR2355  24MHz 105C ULP Microcontroller With 32 KB FRAM, 4 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16  60-V, 5-µA IQ, 100-mA low-dropout (LDO) voltage regulator with enable and power good  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1120 Download Download
Download Download
MSP430FR2353 Download
MSP430FR2355 Download
Download
TPS7A16 Download Download
Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Datasheet (1)
Title Abstract Type Size (KB) Date
PDF 2107 02 Jul 2018
User guides (1)
Title Abstract Type Size (KB) Date
PDF 11116 21 May 2018
Design files (6)
Title Abstract Type Size (KB) Date
ZIP 323 21 May 2018
ZIP 490 21 May 2018
PDF 506 21 May 2018
PDF 107 21 May 2018
PDF 44 21 May 2018
PDF 193 21 May 2018
Related Tools & Software

Software (1)



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