Analog Front End (AFE) for Sensing Temperature in Smart Grid Applications Using RTD Reference Design TIDA-00110 (ACTIVE)

Description & Features

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Key Document

Description

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)

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1148  16-Bit 2kSPS 8-Ch ADC With PGA, Reference, and IDAC for Precision Sensor Measurement  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS1248  24-Bit, 2kSPS, 8-Ch Delta-Sigma ADC for Precision Sensor Measurement  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
CSD17571Q2  30V, N ch NexFET MOSFET™, single SON2x2, 29mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TCA6408A  Low-Voltage 8-Bit I2C and SMBus I/O Expander  I2C  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16  60-V, 5-µA IQ, 100-mA low-dropout (LDO) voltage regulator with enable and power good  Power management  Sample & Buy View Design Kits & Evaluation Modules
TS3A5017  14-Ohm Dual SP4T Analog Switch 3.3-V/2.5-V Analog Multiplexer/Demultiplexer  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1148 Download Download
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ADS1248 Download Download
CSD17571Q2 WSON (DQK)| 6 Download Download
TCA6408A Download Download
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TPS7A16 Download Download
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TS3A5017 Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 4974 22 Dec 2014
Design files (6)
Title Type Size (KB) Date
ZIP 3158 15 Jan 2015
ZIP 477 08 Jan 2015
PDF 2249 08 Jan 2015
PDF 455 08 Jan 2015
PDF 57 08 Jan 2015
PDF 545 08 Jan 2015
Related Tools & Software

Software (3)



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