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

2.4 System Design Theory

Chapter 4.1 of the Heat Meter specification EN1434-2(2) states that all temperature pairs must consist of suitably selected PT sensor elements. Pre-calibrate and pair the PT sensors before they are built into the Heat Meter or alternatively, firmly mount (for example, soldered) them onto the Heat Meter PCB and calibrated afterwards to minimize the temperature offset between these two PT sensors.

Next, EN1434-2(2) also states that other types of temperature sensors may be used. When used, they cannot be separated from the Heat Meter or Heat Calculator device.

Another important fact to consider is the EN60751(1) requirement in Chapter 5.4. Construct all industrial platinum resistance thermometers with an accuracy higher than Class B, or equal to Class A or Class AA in 3- or 4-wire configuration.

These two previous statements do not forbid the use of the TIDA-010002 as a digital temperature sensor (or DRTD) with a 4-wire interface when firmly mounted onto a Heat or Cooling Meter device.

With the TIDA-010002, the Host MCU can read out the DRTD sensor calibration parameters stored in the 48-bit EEPROM area over a I2C-bus and use the this data to achieve the accuracy of a Class AA thermometer. The TIDA-010002 design is an alternative solution to the RTD Precision Temperature measurement subsystem, described in TIDA-01526 and delivers similar resolution and temperature accuracy but only in the –55 to +150°C range, due to its nature of an active semiconductor device.