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

1.1 Key System Specifications

The IEC/EN60751:2008 standard defines four thermometer classes: these are named Class C, B, A, and AA, where C has the lowest and AA the highest accuracy. The lower the accuracy class is, the larger the defined temperature range will be and there are two types of thermometers defined: thin-film or wire-wound. A Class AA thin-film thermometer covers the range of 0°C to 150°C, and a thin-film Class C thermometer has a much wider range of –50°C to 600°C.

The TIDA-010002 reference design demonstrates the excellent temperature measurement accuracy of the TMP117 precision digital sensor, matching the accuracy of the highest Class AA thin-film RTD sensors in the temperature range of –55°C to 150°C.

Table 1-1 Key System Specifications
PARAMETERSPECIFICATIONSDETAILS
Input power sourceProvided by the host MCU or host motherboard, fixed voltage level or thru switched GPIOTable 3-1

Operating Temperature

–55°C to 150°CSection 2.3.2

Accuracy

±0.1°C

Section 2.3.2
Supply voltage1.8 V to 5.5 VSection 3.2.7
Digital RTD sensor configuration4-wire digital interface (SDA, SCL, VDD and GND)Section 2.4.3
Average active state current consumptionDepends on active state durationSection 2.3.2
Active state durationConfigurable thru CONV[2:0] and AVG[1:0] bits in CONFIG registerSection 2.3.2
Average standby-state current consumption3.5-μA, 1-Hz conversion cycleSection 2.3.2
Standby-state durationApproximately 876 ms (if 8 averages in 1 s conversion cycle)Section 2.3.2
Average shutdown-state current consumption150 nASection 2.3.2
Measurements per minute60 or less, user configurableSection 3.1.2
ESD 61000-4-2Air 8 kV / Contact 4 kV ( > 8 KV contact or air discharge)Section 3.2.8