SNAU265D June   2021  – February 2025 HDC3020 , HDC3020-Q1 , HDC3021 , HDC3021-Q1 , HDC3022 , HDC3022-Q1 , HDC3120 , HDC3120-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1HDC3x Devices
    1. 1.1 HDC3x2x Package Comparison
    2. 1.2 HDC3020 in WSON
    3. 1.3 HDC3021 in WSON
    4. 1.4 HDC3022 in WSON
    5.     HDC3120 in WSON
  5. 2Storage and Handling Guidelines
    1. 2.1 Exposure to Contaminants
    2. 2.2 Chemical Analysis
      1. 2.2.1 Saturation and Recovery Tests
      2. 2.2.2 Long-Term Exposure
    3. 2.3 Packaging and Storing
      1. 2.3.1 Assembly
      2. 2.3.2 Application in Extreme Environment
  6. 3Programming the HDC3020
    1. 3.1 The Functional Modes
    2. 3.2 Trigger-On Demand
    3. 3.3 Auto Measurement
    4. 3.4 Programming the CRC
      1. 3.4.1 CRC C Code
    5. 3.5 Example Code
    6. 3.6 Condensation Removal
    7. 3.7 Offset Error Correction
      1. 3.7.1 Offset Error Correction Example With a Fingerboard
  7. 4References
  8. 5Revision History

3.3 Auto Measurement

Auto Measurement mode is a continuous operation mode. The user can select the measurement frequency between 10 samples a second to 1 sample every 2 seconds.

To configure the device to collect both the humidity and temperature data in continuous mode, select the desired Auto Measurement mode and low power mode duration from the command table. To obtain the temperature and humidity values, the user can issue commands 0x0E & 0x00. After placing the device into the auto measurement mode desired (see the I2C Read Multi Data Result table in the HDC3020 data sheet), the user should issue command code 0xE0 0x00 at coinciding time intervals to read out the temperature and relative humidity measurement values.

HDC3020 Flowchart for Auto Measurement Mode Figure 3-2 Flowchart for Auto Measurement Mode