TIDUEA0A March   2019  – September 2020

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 Device Recommendation
      2. 2.3.2 Digital Temperature Sensor - TMP117
      3. 2.3.3 Digital Temperature Sensor - TMP116
      4. 2.3.4 ESD Protection Devices
    4. 2.4 System Design Theory
      1. 2.4.1 PT100, PT500, PT1000 based Measurement in Heat Meters
      2. 2.4.2 TMP117 Configuration as Temperature Sensor
      3. 2.4.3 Digital RTD Solution Using TMP117
      4. 2.4.4 Ambient Temperature Considerations
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Interface Test Software for TMP116
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup for Performance Testing
      2. 3.2.2 EMI and EMC Test Requirements for DRTD
      3. 3.2.3 TMP117 EMI/EMC Test Results
      4. 3.2.4 TMP117 Based Temperature Probe Measurement Performance Test Results
      5. 3.2.5 TMP116 Based Temperature Probe Measurement Performance Test Results
      6. 3.2.6 I2C-bus Cable Length Considerations
      7. 3.2.7 Power Supply
      8. 3.2.8 ESD Test Results for TMP116
      9. 3.2.9 Summary
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
  12. 7About the Author
  13. 8Revision History

3.2.9 Summary

The test results for the TIDA-010002 reference design mounted into a metal body with a 4-wire cabling proves that the measurement accuracy meets Class AA thermometer requirements as per DIN EN 60751:2008 (German and EU norm) .

A single (1-point) offset adjustment is necessary to achieve Class AA accuracy over the full temperature range of the TIDA-010002 from –55°C to +150°C; no TMP117 calibration is necessary if Class A accuracy is sufficient for the user application.

Overall, DRTDs offer the highest accuracy of Class A or Class AA RTD sensors in combination with the unique feature of EEPROM on-chip memory for storing user defined calibration data.

The storage of calibration data per DRTD sensor is a major advantage versus standard platinum RTDs and enables significant cost savings for the sensor manufacturer and sensor end customers by reducing the paperwork and calibration data handling effort.

The wider operating temperature range of –55ºC enables higher precision in multiple applications beyond metering.

ESD61000-4-2 level 4 compliance for contact discharge test voltage of ± 8 kV and air discharge test voltage of ±15 kV has been verified.

If no backwards compatibility to the PT sensors interface is required, as is the case for many Heat and Cooling Meters, where the PT sensors and the flow meter subsystem build a single unit and can only be replaced altogether, the introduced TIDA-010002 DRTD can deliver system cost savings, due to simplified handling of calibration data, the removal of multiple passive components and simplified PCB design due to the elimination of matched signal PCB traces. Also, the complicated resistance to temperature conversion calculations compared to traditional industrial thin-film RTD sensors are completely redundant, making the user application code development much simpler and saving some extra power due to less MCU operation cycles.

Detailed test results including pictures, test conditions, plots, and results are available and can be provided based on request.