TIDA-00110

Analog Front End (AFE) for Sensing Temperature in Smart Grid Applications Using RTD Reference Design

TIDA-00110

Design files

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)

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU575.PDF (4974 K)

Reference design overview and verified performance test data

TIDRCG3.PDF (545 K)

Detailed schematic diagram for design layout and components

TIDRCG4.PDF (57 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRCG5.PDF (455 K)

Detailed overview of design layout for component placement

TIDRCL2.ZIP (3158 K)

Files used for 3D models or 2D drawings of IC components

TIDC853.ZIP (477 K)

Design file that contains information on physical board layer of design PCB

TIDRCG6.PDF (2249 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Analog switches & muxes

TS3A50173.3-V, 4:1, 2-channel general-purpose analog multiplexer

Data sheet document-pdfAcrobat PDF open-in-new HTML
I2C general-purpose I/Os (GPIOs)

TCA6408A8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers

Data sheet document-pdfAcrobat PDF
Linear & low-dropout (LDO) regulators

TPS7A16100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS114816-bit 2-kSPS ADC with PGA, reference and IDAC for precision sensor measurement

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS124824-Bit, 2kSPS, 8-Ch Delta-Sigma ADC for Precision Sensor Measurement

Data sheet document-pdfAcrobat PDF open-in-new HTML

Start development

Software

Code example or demo

TIDA-00110 Code Examples – TIDC765.PDF (481 K)

GUI for evaluation module (EVM)

TIDA-00110 RTD GUI – TIDC854.ZIP (1814 K)

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Design guide Analog Front End for Sensing Temperature in Smart Grid Applications Using RTD Dec. 22, 2014
Technical article Check out latest reference design of Analog Front End for Sensing Temperature in Grid Infrastructure Using RTD Jan. 13, 2015

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

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. ​​​​​​​​

Videos