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

1 System Description

Heat Meters are commonly used for billing heat energy for residential users in multi-dwelling units across many countries, while Cooling Meters are often found in commercial, storage, or logistic buildings and industrial environments. Heat Meters and Cooling Meters are both thermal energy meters, as defined in Annex VI of the Measuring Instruments Directive (MID) 2014/32/EU(4) of the European Parliament and of the Council of 26 February 2014. The MID document is the harmonization of the laws of the member states related to creating a common market for measuring instruments across all countries of the EU. Cooling Meters are not part of the MID and are usually regulated nationally.

Thermal energy meters are basically regular flow meters, for example water meters, extended with a precise differential temperature measurement (DTM) subsystem to capture the temperature difference between the inlet and the outlet flow. If the medium temperature flow of the inlet is lower than the temperature of the outlet, then heat is being dissipated, otherwise heat gets absorbed, which means this is a cooling system.

Heat Meters and Cooling Meters are therefore very similar. However, in order to be able to use both types for billing, a type examination certificate is required in each case. For a type examination certificate the requirements of EN 1434 must be fulfilled. Texas Instruments has a close cooperation with JUMO GmbH & Co. KG to fulfil these requirements and create a type examination certificate.