±0.5°C 2-Wire Galvanically Isolated IC Temp Sensor with Pulse Count Interface Reference Design

(ACTIVE) TIDA-00752

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Key Document

Description

In order to provide system designers a new cost-effective and easy alternative to assured precision temperature measurement, this reference design discusses the new tiny 2-pin digital output IC temperature sensor with single wire pulse count interface that enhances reliability and greatly simplifies the design of galvanic isolation architecture for sending both power and unidirectional data through same low profile transformer and remote operation. In addition, with fewer error sources, computation of error budget is easier. Cost budgets, accuracy, size and simplicity of interfacing with other circuit elements are main factors in selecting a sensor to do a job and this reference design system tremendously helps in meeting all these requirements. With less-than 0.25°C maximum measured error over temperature range -50°C to 150°C, functional isolation of 400VRMS and IEC61000-4-4 pre-compliance testing, this design significantly reduces the design time for development of high-accuracy temperature measurement systems.

Features
  • Allows Single Low-Profile Transformer for Power and Data Isolation While Eliminating the Need for Optocoupler or Digital Isolator on Data Line
  • Power and Data Coexist on 2–Wire Interface for Remote Temperature Sensing Across Isolation
  • No Need of System Level Calibration Unlike Thermistors
  • Replacement for RTDs and NTC or PTC Thermistors
  • Eliminates High-Precision Active or Passive Components
  • Functional Isolation of 400 VRMS and Dielectric up to 2500-V AC for 60 seconds
  • Pre-Compliance Testing: Meets IEC61000-4-4 EFT (Level 4): ±2 kV – Class-A
  • Accuracy Over Temperature:
    • Measured Error Using LUT: < 0.25ºC (-35ºC to 150ºC)
    • Measured Error Using 1st Order Transfer Function: < 0.25ºC (15ºC to 100ºC)
    • Guaranteed Limits from LMT01 Datasheet Using LUT: < 0.5 max. (-20ºC to 90ºC), 0.62 max. (90ºC to 150ºC), < 0.7 max. (-50ºC to -20ºC)

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMT01  0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface  Temperature Sensors  Sample & Buy View Design Kits & Evaluation Modules
MSP430F5528  16-Bit Ultra-Low-Power Microcontroller, 128KB Flash, 8KB RAM, USB, 12Bit ADC, 2 USCIs, 32Bit HW MPY  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
SN6505B  Low-Noise 1-A , 420kHz Transformer Driver for Isolated Power Supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TPD2E001  Low-Capacitance 2-Channel +/-15kV ESD Protection Array for High-Speed Data Interfaces  Circuit Protection  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1998 20 Jun 2016 1,463
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 712 09 Dec 2015 44
PDF 1359 09 Dec 2015 207
PDF 164 09 Dec 2015 41
PDF 59 09 Dec 2015 60
PDF 535 09 Dec 2015 747
Related Tools & Software

Software (1)




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