HART-enabled PLC analog input module reference design TIDA-060020 (ACTIVE)

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Key Document

Description

This reference design is a single-channel, 4-mA to 20-mA analog input module that supports the highway addressable remote transducer (HART) communication protocol, enabling bidirectional digital communication between field transmitters and programmable logic controllers (PLCs). The loop current, representing the primary variable, flows through a current-sense resistor producing a proportional voltage that is digitized by a precision delta-sigma analog-to-digital converter (ADC) (ADS1260). A DAC8740H modem is used in this design to implement HART communication across the current loop. The ADS1260 and DAC8740H are interfaced with an external microcontroller that controls the ADS1260 sampling and includes a HART software stack to support the HART protocol. This design also features digital isolation, a wide power-supply range, and a high-precision external voltage reference for the ADC.

Features
  • 4-20 mA analog input with HART modem
  • High accuracy loop current measurement < 0.05% FSR TUE
  • HART physical layer compliance tested
  • 6V-28V power supply input
  • 20 effective bits for loop-current measurement

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1260  24-bit, 40-kSPS, 5-ch delta-sigma ADC with PGA, VREF and IDACs for factory automation  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
DAC8740H  HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant modem with UART interface  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
ISO7741  High-speed, low-power, robust EMC quad-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7742  High-speed, low-power, robust-EMC quad-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
REF3425  2.5-V low-drift low-power small-footprint series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TLV760  100-mA, 30-V wide-VIN, fixed-output linear voltage regulator  Power management  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1260 Download Download
DAC8740H Download -
ISO7741 Download Download
Download Download
ISO7742 Download Download
Download Download
REF3425 Download Download
TLV760 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1153 24 Oct 2018
Design files (6)
Title Type Size (KB) Date
PDF 595 24 Oct 2018
ZIP 449 24 Oct 2018
ZIP 796 24 Oct 2018
PDF 133 24 Oct 2018
PDF 192 24 Oct 2018
PDF 49 24 Oct 2018

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