SBOU319A November   2024  – June 2025 HDC3120

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 HDC3120EVM Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Setup and Interface
      1. 2.1.1 Setup Overview
      2. 2.1.2 Connecting Board Power and Ground
      3. 2.1.3 Connecting to the HDC3120 and Comparator Outputs
      4. 2.1.4 Temperature
      5. 2.1.5 Relative Humidity (RH)
      6. 2.1.6 HDC3120EVM Buttons
        1. 2.1.6.1 Reset Button (SW1)
        2. 2.1.6.2 Heater Enable Switch (S2)
    2. 2.2 Comparator Function
  9. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
      1. 3.2.1 Layout Overview
      2. 3.2.2 Layout Guidelines
    3. 3.3 Bill of Materials (BOM)
  10. 4Additional Information
    1. 4.1 Trademarks
  11. 5Related Documentation
  12. 6Revision History

2.1.3 Connecting to the HDC3120 and Comparator Outputs

HDC3120EVM HDC3120EVM OutputsFigure 2-3 HDC3120EVM Outputs

The temperature (TEMP) and relative humidity (RH) outputs of the HDC3120 are available through either 3-position terminal blocks or optional SMA connectors. These outputs are represented as ratiometric analog voltages, meaning the outputs scale proportionally to the supply voltage (VDD). This design provides consistent measurements even in the presence of supply fluctuations. Figure 2-4 shows the temperature output profile of the HDC3120 based on the supply voltage of the device. Figure 2-5 shows the same for the relative humidity output profile.

Additionally, the equations for converting the temperature and relative humidity voltage outputs to physical units are included in the following sections.