TIDUDW4B January   2019  – December 2024 CC2640R2F , TMP117

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TMP119
      2. 2.3.2 CC2340R5
    4. 2.4 System Design Theory
      1. 2.4.1 Shelf Life and Active Life
      2. 2.4.2 Wearer Comfort
      3. 2.4.3 System Accuracy
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
        1. 3.1.2.1 Reading From the Patch
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
        1. 3.2.1.1 Current Consumption and Life Span
      2. 3.2.2 Test Results
        1. 3.2.2.1 Current Consumption and Lifespan
  10. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Considerations for the CC2340R5
      2. 4.3.2 Layout Considerations for the TMP119
        1. 4.3.2.1 WCSP (YBG) Package
      3. 4.3.3 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
    7. 4.7 Related Documentation
    8. 4.8 Trademarks
    9. 4.9 Revision History

2.4.2 Wearer Comfort

This design uses a 2-layer flex PCB to reduce thermal mass and maximize board flexibility. The primary benefit of flexibility is the ease and comfort for the wearers, which improves the likelihood that the patch remains static on the patient. Keep regions such as the RF portion that require solid ground planes as small as possible to minimize the portion of the board that feels rigid to the wearer. Wearer comfort cannot be quantified, so considering this factor in the design of any final products is important. Enclosing a final system in soft-gauze or various types of bandages to pad between the board and the wearer is an option. If this is done, take care to make sure that the thermal path between the TMP119 and the wearer's skin is still optimized for response time and accuracy. The final product must also be characterized with the expected packaging included. The recommendations listed in the Layout Considerations for Wearable Temperature Sensing and Design Challenges of Wireless Patient Temperature Monitors application briefs can help the designer improve system response time and accuracy.