TIDA-00110
Analog Front End (AFE) for Sensing Temperature in Smart Grid Applications Using RTD Reference Design
TIDA-00110
Overview
This reference design enables up to 4 Resistor Temperature Detectors (RTD) to be connected through one ADC in manner such that the solution is both compact and modular. Communication from the ADC to the processor is though an SPI interface. If 8 RTDs are required for an application, simply connect up one more of these modules. This solution is flexible to where it can handle 2 wire, 3 wire or 4 wire type RTDs.
Features
- Based on the ADS1248 24-Bit Delta-Sigma (ΔΣ) ADC With Internal PGA and Selectable Gain up to 128
- Can Measure 2-, 3-, or 4-Wire RTD Inputs
- Multiplexer (Analog Switch) to Switch Excitation Currents for Four RTD Inputs
- Uses Ratiometric Measurement for Higher Accuracy
- Accuracy < ±2°C Without Calibration for Pt100
- I2C I/O Expander for ADC Interface Control and Excitation Current Switching Provided (No External I/Os Required)
Industrial
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.
Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
CSD17571Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm
Data sheet: PDF | HTMLStart development
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Analog Front End for Sensing Temperature in Smart Grid Applications Using RTD | Dec. 22, 2014 | |
| User guide | TIDA-00110 Code Examples | Nov. 18, 2014 |
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.