TIDA-00110 Reference Design

Texas Instruments

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

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 128Can Measure 2-: 3-: or 4-Wire RTD InputsMultiplexer (Analog Switch) to Switch Excitation Currents for Four RTD InputsUses Ratiometric Measurement for Higher AccuracyAccuracy I2C I/O Expander for ADC Interface Control and Excitation Current Switching Provided (No External I/Os Required)
Applications
  • Solar power optimizer
  • Multifunction relay
  • Grid asset monitoring
  • Arbitrary waveform generator (AWG)
  • Expansion module
  • Substation automation
  • Circuit breaker (ACB
  • MCCB
  • VCB)
Product Categories
  • Data converters

Parts

Part Number Name Companion Part
ADS1148 ADS1148 Buy Datasheet
ADS1248 ADS1248 Buy Datasheet
CSD17571Q2 CSD17571Q2 Buy Datasheet
TCA6408A TCA6408A Buy Datasheet
TS3A5017 TS3A5017 Buy Datasheet

Bill Of Materials

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Schematic

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Test Data

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Other Documents

Title Updated Type Size (KB)
TIDA-00110 Altium 15 Jan 2015 ZIP 3158
TIDA-00110 Gerber 08 Jan 2015 ZIP 477
TIDA-00110 PCB 08 Jan 2015 PDF 2249
TIDA-00110 Assembly Drawing 08 Jan 2015 PDF 455
TIDA-00110 BOM 08 Jan 2015 PDF 57
TIDA-00110 Schematic and Block Diagram 08 Jan 2015 PDF 545