SNAA420A June   2025  – August 2025 HDC3020 , HDC3020-Q1 , HDC3021 , HDC3021-Q1 , HDC3022 , HDC3022-Q1 , HDC3120 , HDC3120-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Motivation
    2. 1.2 The Physics of Humidity and Water Ingress
  5. 2Test Methodology
  6. 3Assumptions
  7. 4Proposed Algorithm Using Slew Rate Threshold
  8. 5Test Results
    1. 5.1 Test Results at Indoor Ambient Conditions
    2. 5.2 Test Results at Hot and Cold Temperature Conditions
    3. 5.3 Vent Submersion and Air Exchange Tests
  9. 6Summary
  10. 7References
  11. 8Revision History

5 Test Results

The HDC3020 humidity sensor's response to water ingress was tested across various steady-state conditions, including different ambient temperatures, ambient humidity levels, and amounts of water. The test results confirmed that RH increased when the water ingress occurred, and the RH increase was more pronounced in dry conditions and for larger volumes of water. Thorough data analysis revealed that the most reliable way to detect an ingress event for the given vented test enclosure is to look at the RH slew rate over a 10-second window.