JAJSMG0C june   2021  – december 2022 HDC3020 , HDC3021 , HDC3022

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 I2C Interface Timing
    7. 7.7 Timing Diagram
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Factory Installed Polyimide Tape
      2. 8.3.2  Factory Installed IP67 Protection Cover
      3. 8.3.3  Measurement of Relative Humidity and Temperature
      4. 8.3.4  Offset Error Correction: Accuracy Restoration
      5. 8.3.5  NIST Traceability of Relative Humidity and Temperature Sensor
      6. 8.3.6  Measurement Modes: Trigger-On Demand vs Auto Measurement
      7. 8.3.7  Heater
      8. 8.3.8  ALERT Output With Programmable Interrupts
      9. 8.3.9  Checksum Calculation
      10. 8.3.10 Programmable Offset of Relative Humidity and Temperature Results
    4. 8.4 Device Functional Modes
      1. 8.4.1 Sleep Mode vs Measurement Mode
    5. 8.5 Programming
      1. 8.5.1 I2C Interface
      2. 8.5.2 I2C Serial Bus Address Configuration
      3. 8.5.3 I2C Write - Send Device Command
      4. 8.5.4 I2C Read - Retrieve Single Data Result
      5. 8.5.5 I2C Read - Retrieve Multi Data Result
      6. 8.5.6 I2C Repeated START - Send Command and Retrieve Data Results
      7. 8.5.7 Command Table and Detailed Description
        1. 8.5.7.1 Reset
          1. 8.5.7.1.1 Soft Reset
          2. 8.5.7.1.2 I2C General Call Reset
        2. 8.5.7.2 Trigger-On Demand
        3. 8.5.7.3 Auto Measurement Mode
          1. 8.5.7.3.1 Auto Measurement Mode: Enable and Configure Measurement Interval
          2. 8.5.7.3.2 Auto Measurement Mode: Measurement Readout
          3. 8.5.7.3.3 Auto Measurement Mode: Exit
          4. 8.5.7.3.4 Auto Measurement Mode: Measurement History Readout
          5. 8.5.7.3.5 Override Default Device Power-On and Device-Reset State
        4. 8.5.7.4 ALERT Output Configuration
          1. 8.5.7.4.1 ALERT Output: Environmental Tracking of Temperature and Relative Humidity
          2. 8.5.7.4.2 ALERT Output: Representation of Environmental Thresholds and Default Threshold Values
          3. 8.5.7.4.3 ALERT Output: Steps to Calculate and Program Environmental Thresholds
          4. 8.5.7.4.4 ALERT Output: Deactivation of Environmental Tracking
          5. 8.5.7.4.5 ALERT Output: Transfer Thresholds into Non-Volatile Memory
        5. 8.5.7.5 Programmable Measurement Offset
          1. 8.5.7.5.1 Representation of Offset Value and Factory Shipped Default Value
          2. 8.5.7.5.2 Factory Shipped Default Offset Values
          3. 8.5.7.5.3 Calculate Relative Humidity Offset Value
          4. 8.5.7.5.4 Calculate Temperature Offset Value
          5. 8.5.7.5.5 Write an Offset Value
          6. 8.5.7.5.6 Verify a Programmed Offset Value
        6. 8.5.7.6 Status Register
        7. 8.5.7.7 Heater: Enable and Disable
        8. 8.5.7.8 Heater: Configure Level of Heater Current
        9. 8.5.7.9 Read NIST ID/Serial Number
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
      3. 9.4.3 Storage and PCB Assembly
        1. 9.4.3.1 Storage and Handling
        2. 9.4.3.2 Soldering Reflow
        3. 9.4.3.3 Rework
        4. 9.4.3.4 Exposure to High Temperature and High Humidity Conditions
        5. 9.4.3.5 Bake/Rehydration Procedure
  10. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 ドキュメントの更新通知を受け取る方法
    3. 10.3 サポート・リソース
    4. 10.4 Trademarks
    5. 10.5 静電気放電に関する注意事項
    6. 10.6 用語集
  11. 11Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
  • DEF|8
サーマルパッド・メカニカル・データ
発注情報
8.5.7.3.4 Auto Measurement Mode: Measurement History Readout

Within Auto Measurement Mode, the HDC302x maintains a history of the maximum and minimum measurement for temperature and relative humidity (described as variables MIN T, MAX T, MIN RH, and MAX RH). This feature is useful for scenarios where the user would like to assess if the ambient conditions ever approached, but did not surpass, the defined environmental thresholds as documented in ALERT Output: Environmental Tracking of Temperature and Relative Humidity. Table 8-5 summarizes the status of MIN T, MAX T, MIN RH, and MAX RH based on device configuration.

Table 8-5 Status of Measurement History Variables Based on HDC302x Configuration
HDC302x ConfigurationMIN TMAX TMIN RHMAX RH
Outside of Auto Measurement Mode130°C-45°C100%0%
Within Auto Measurement ModeMonitored and Latched When Appropriate

Whenever the HDC302x exits Auto Measurement Mode (for example, through Auto Measurement Mode: Exit, Soft Reset, General Call Reset), all four variables will return to their default values documented in Table 8-5. Therefore, measurement history readouts outside of Auto Measurement Mode are invalid. Figure 8-20, Figure 8-21, Figure 8-22, and Figure 8-23 illustrate the I2C sequence for measurement readout of MIN T, MAX T, MIN RH, and MAX RH.

GUID-D7AB402D-65FD-4222-92C1-0EF078E80251-low.gifFigure 8-20 I2C Sequence: Minimum Temperature Measurement Readout (Auto Measurement Mode)
GUID-086C828E-D27D-4295-94D5-20F802A6D312-low.gifFigure 8-21 I2C Sequence: Maximum Temperature Measurement Readout (Auto Measurement Mode)
GUID-51F0F74C-A1DB-4C42-9491-DB250C7DEA02-low.gifFigure 8-22 I2C Sequence: Minimum Relative Humidity Measurement Readout (Auto Measurement Mode)
GUID-A6E23460-9A56-4400-8832-B2D9DE613855-low.gifFigure 8-23 I2C Sequence: Maximum Relative Humidity Measurement Readout (Auto Measurement Mode)