TIDA-00165
Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design
TIDA-00165
Overview
This is a reference design for a robust, low power, precise and long-term stable 2-wire loop powered 4 to 20mA current output temperature transmitter. It uses RTD temperature sensor with 4 to 20mA current loop transmitter. It also explains sensor signal conditioning, ratiometric measurement technique, recommended software flow, calibration, sensor linearization, PCB layout and other practical design considerations. Furthermore, external protection circuitry is deployed in-place for compliance with regulatory IEC61000-4 standards – EFT, ESD and Surge requirements. EMC compliance to IEC61000-4 is necessary to ensure that the design not only survives but also performs as intended in the harsh/noisy industrial environment. All the relevant design files like Schematics, BOM, Layer plots, Altium files, Gerber and MSP430 MCU software have also been provided to the users.
Features
- Small form factor (L X W): 71.12mm X 6mm
- Sensor input compatible with 2-, 3- or 4-wire RTD probes
- Connects to any RTD from PT100 to PT1000
- Maximum measured error: 0.2°C
- Output resolution: 0.76µA
- Input power supply range: 10V to 33V DC
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDU385A.PDF (16567 K)
Reference design overview and verified performance test data
TIDR966.PDF (7610 K)
Detailed schematic diagram for design layout and components
TIDR967.PDF (208 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDR968.ZIP (140 K)
Detailed overview of design layout for component placement
TIDR970.ZIP (1880 K)
Files used for 3D models or 2D drawings of IC components
TIDC543.ZIP (359 K)
Design file that contains information on physical board layer of design PCB
TIDR969.PDF (957 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
MSP430 microcontrollers
MSP430FR5738 — 24 MHz MCU with 16KB FRAM, 1KB SRAM, 10-bit ADC , comparator, UART/SPI/I2C, timer
Data sheet: PDF | HTMLPrecision DACs (≤10 MSPS)
DAC161S997 — 16-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive
Data sheet: PDF | HTMLStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Small Form Factor, 2-Wire, 4- to 20-mA Current-Loop, RTD Temperature Transmitter (Rev. A) | Nov. 11, 2014 | |
| Technical article | Delta-sigma ADC basics: Walking around the delta-sigma blocks | Mar. 03, 2015 | ||
| White paper | Powering sensors with LDOs for industrial process control white paper | Feb. 12, 2015 | ||
| Technical article | My New Year’s Resolution: Benefit from the high resolution delta-sigma ADCs | Jan. 06, 2015 | ||
| More literature | TIDA-00165 Firmware | Jul. 30, 2014 |
Related design resources
Reference designs
REFERENCE DESIGN
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