Software
Firmware
TIDA-00095
RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems
TIDA-00095
Overview
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
Industrial
- Analytical lab instrumentation
- Capacitive Level Transmitter
- Capacitive pressure transmitter
- Coriolis Flow Transmitter
- Differential Pressure Flow Transmitter
- Electromagnetic (MID) flow transmitter
- Hydrometric Pressure Level Transmitter
- Impeller / Turbine Flow Transmitter
- Inductive & capacitive position sensor
- LVDT Position Sensor
- LVDT pressure transmitter
- Optical ToF continuous wave position sensor
- Optical ToF pulse position sensor
- Programmable DC power supply
- Proximity switch
- Radar / microwave level transmitter
- Resistive pressure transmitter
- Silicon pressure transmitter
- System controller
- Temperature transmitter
- Thermal Mass Flow Transmitter
- Ultrasonic flow transmitter
- Ultrasonic level transmitter
- Ultrasonic position sensor
- Unit controller
- Vortex flow transmitter
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.
TIDR389.PDF (212 K)
Detailed schematic diagram for design layout and components
TIDR390.ZIP (23 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDU214.PDF (257 K)
Detailed overview of design layout for component placement
TIDU215.PDF (274 K)
Detailed overview of design layout for component placement
TIDC268.ZIP (765 K)
Files used for 3D models or 2D drawings of IC components
TIDC269.ZIP (2301 K)
Design file that contains information on physical board layer of design PCB
TIDU212.PDF (1492 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
MSP430 microcontrollers
MSP430G2513 — 16 MHz MCU with 16KB FLASH, 512B SRAM, comparator, UART/SPI/I2C, timer
Data sheet: PDFPrecision 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
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 2
| Type | Title | Date | ||
|---|---|---|---|---|
| * | User guide | RTD Temp Transmitter for 2-Wire 4- to 20-mA Current Loop Systems (Rev. A) | Feb. 11, 2014 | |
| Analog Design Journal | Low-IQ synchronous buck converter enables intelligent field-sensor applications | Apr. 26, 2016 |
Related design resources
Reference designs
REFERENCE DESIGN
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.