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TIDA-00110

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

Design files

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)
Industrial
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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.

download Design guide — TIDA-00110
TIDU575.PDF (4974 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00110
TIDRCG3.PDF (545 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00110
TIDRCG4.PDF (57 K)

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

download Assembly drawing — TIDA-00110
TIDRCG5.PDF (455 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00110
TIDRCL2.ZIP (3158 K)

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

download Gerber file — TIDA-00110
TIDC853.ZIP (477 K)

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

download PCB layout — TIDA-00110
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

TS3A5017 — 3.3-V, 4:1, 2-channel general-purpose analog multiplexer

Data sheet: PDF | HTML
I2C general-purpose I/Os (GPIOs)

TCA6408A — 8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A16 — 100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
MOSFETs

CSD17571Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
Precision ADCs

ADS1148 — 16-bit 2-kSPS ADC with PGA, reference and IDAC for precision sensor measurement

Data sheet: PDF | HTML
Precision ADCs

ADS1248 — 24-bit, 2-kSPS, eight-channel delta-sigma ADC for precision sensor measurement

Data sheet: PDF | HTML

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Software

Support software

TIDC855 — TIDA-00110 Temperature Measurement With RTD for Transformer/Generator Protection

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TIDC855 — TIDA-00110 Temperature Measurement With RTD for Transformer/Generator Protection

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Version: 01.00.00.00
Release date: 07 Jan 2015
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TIDA-00110 Temperature Measurement With RTD for Transformer/Generator Protection (zip)  — 1938 K

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Technical documentation

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* 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

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