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

3.2.8 ESD Test Results for TMP116

Using industry standard ESD test generators calibrated to the IEC/EN test waveforms, TIDA-010002 PCB has been tested for ESD compliance as shown in Table 3-5. For more details on the ESD test setup used, see IEC 61000-4-x Tests for TI’s Protection Devices.

As per the EN1434-4 requirements, EN61000-4-5 testing is only applicable if the cable length for the RTD sensor is longer than 10 m, which is quite challenging for I2C-bus connection. Nevertheless, a surge test has been run with an actual pulse voltage of 29 V through a 2-Ω load plus the 2.83-Ω dynamic resistance of the ESD device and the TMP116 downstream device.

For a surge test with a 42-Ω load (2 Ω is the CWG source impedance and 40 Ω from the coupling network) plus the ESD351 + TMP116 dynamic resistance of 2.83 Ω the result is 44.83 times the amount of current 6 A or approximately 269 V.

The 269 V are almost half of the 500 V, required for signal cables longer than 10 m.

Table 3-5 ESD Testing of TIDA-010002
EN 61000-4-2 ESD TEST LEVELCONTACT DISCHARGE TEST VOLTAGE (± kV)AIR DISCHARGE TEST VOLTAGE (± kV)TIDA-010002 WITH ESD351
4815passed

The ESD compliance achieved and listed in Table 3-5 is nearly double of the required (as per EN 1434-4:2014-04) limits for contact discharge of 4 kV and air discharge of 8 kV.

Here the TPD1E04U04 device can be an alternative, as it is specified for ±16 kV IEC 61000-4-2 level 4 ESD protection, which is also above the required minimum.

Either of the ESD351 or TPD1E04U04 protection devices can be populated as they share a single 0402 footprint on the TIDA-010002 PCB, providing alternatives based on price or performance.