SNAS778A June   2021  – September 2021 HDC3020 , HDC3021 , HDC3022

ADVANCE INFORMATION  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison
  6. Pin Configuration and Functions
  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 Switching Characteristics
    7. 7.7 Timing Diagram
    8. 7.8 Typical Characteristics
  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  Drift 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 Read NIST ID/Serial Number
  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
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Storage and PCB Assembly
      1. 11.3.1 Storage and Handling
      2. 11.3.2 Soldering Reflow
      3. 11.3.3 Rework
      4. 11.3.4 Exposure to High Temperature and High Humidity Conditions
      5. 11.3.5 Bake/Rehydration Procedure
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Package Option Addendum
    2. 13.2 Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
  • DEF|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Electrical Characteristics

TA = -40°C to 125°C, VDD = 1.62V to 5.50V (unless otherwise noted), Typical Specifications are TA = 25°C, VDD = 1.8V unless otherwise noted 
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Current Consumption
IDD_ACTIVE Active Current(1) Low Power Mode 0 (lowest noise) 125 TBD µA
Low Power Mode 1 TBD
Low Power Mode 2 TBD
Low Power Mode 3 (lowerest power) 100 TBD
IDD_SLEEP Sleep Current(1) No Active Measurement
trigger on demand mode
 
0.4 TBD µA
No Active Measurement, 
auto measurement mode
0.55 TBD
IDD_AVG_EQN Averaged Current Equation  measurement freq = numbers of samples per second (9)
IDD_AVG Averaged Current(1) (2) trigger on demand mode, low Power Mode 3 (lowest Power)
Averaged at 1 sample per second
0.7 µA
trigger on demand mode, low Power Mode 3 (lowest Power)
Averaged at 1 sample per 10 seconds
0.4
automeasurement mode, Low Power Mode 0 (lowest noise)
Averaged at 1 sample per second
2.0
automeasurement mode, Low Power Mode 1
Averaged at 1 sample per second
1.2
automeasurement mode, Low Power Mode 2
Averaged at 1 sample per second
1.0
automeasurement mode, low Power Mode 3 (lowest power)
Averaged at 1 sample per second
0.9
automeasurement mode, Low Power Mode 3 (lowest power)
Averaged at 1 sample every two seconds
0.7
IHEATER Heater Current (Condensation Removal) THEATER - TAMBIENT = 20°C. VDD = 3.3V for Typical Value 30 TBD mA
Sensor Timing
tmeas Measurement Duration (8) Low Power Mode 0 (lowest noise) 12.0 TBD ms
Low Power Mode 1 7.0 TBD
Low Power Mode 2 4.5 TBD
Low Power Mode 3 (lowest power) 3.3 TBD
SensorPUR Power Up Ready Sensor ready once VDD ≥ 1.62V
TA = 25°C
0.5 1 ms
Sensor ready once VDD ≥ 1.62V 1.5
SensorSRR Soft Reset Ready Sensor ready once Soft Rest Command received
TA = 25°C
0.5 1 ms
Sensor ready once Soft Rest Command received 1.5
Relative Humidity Sensor
RHACC Accuracy(3) (4) TA = 25°C, 10% to 90% RH
±1.5 ±2 %RH
RHREP Repeatability at ambient room tempTA = 25°C, 10% to 90% RH
Low Power Mode 0 (lowest noise)
 
±0.02 %RH
TA = 25°C, 10% to 90% RH
Low Power Mode 1
TBD
TA = 25°C, 10% to 90% RH
Low Power Mode 2
TBD
TA = 25°C, 10% to 90% RH
Low Power Mode 3 (lowest power)
TBD
RHHYS Hysteresis (5) TA = 25°C, 10% to 90% RH
±1 %RH
RHRT Response Time(6) (7) TA = 25°C, 10% to 90% RH
t63% step.
4 s
RHLTD Long-term Drift (4) 0.21 %RH/yr
Temperature Sensor
TEMPACC Accuracy
-20°C ≤ TA ≤ 60°C
±0.1 ±0.3 °C

-40°C ≤ TA < -20°C or 60°C < TA ≤ 125°C
±0.2 ±0.4
TEMPREP Repeatability Low Power Mode 0 (lowest noise) ±0.04 °C
Low Power Mode 1 TBD
Low Power Mode 2 TBD
Low Power Mode 3 (lowest power) ±0.07
TEMPRT Response Time (in air) (6) (10) 25C <TA< 75C

t63% step
TBD s
TEMPLTD Long Term Drift ±0.03 °C/yr
SCL, SDA Pins
VIL LOW-level input voltage 0.3*VDD V
VIH HIGH-level input voltage 0.7*VDD V
VOL LOW-level output voltage IOL = 3 mA 0.4 V
Control Pins
VOH_ALERT High-level Output Voltage - ALERT IOH = -100 µA VDD–0.2 V
VOL_ALERT Low-level Output Voltage - ALERT IOL = 100 µA 0.2 V
VIH_ADDR High Level Input Voltage - ADDR 0.7*VDD V
VIL_ADDR Low Level Input Voltage - ADDR 0.3*VDD V
VIH_ADDR1 High Level Input Voltage - ADDR1 0.7*VDD V
VIL_ADDR1 Low Level Input Voltage - ADDR1 0.3*VDD V
VIH_RESET High Level Input Voltage - RESET 0.7*VDD V
VIL_RESET Low Level Input Voltage - RESET 0.3*VDD V
II_ADDR Input Leakage Current - ADDR VI = VDD or GND -1 1 µA
II_ADDR1 Input Leakage Current - ADDR1 VI = VDD or GND -1 1 µA
EEPROM (T, RH offset)
OSEND Program Endurance 1000 50000 Cycles
OSRET Data Retention Time 100% Power-On hours 10 100 Years
Does not include I2C read/write communication or pullup resistor current through SCL and SDA
Average current consumption while conversion is in progress
Excludes hysteresis and long-term drift
Based on THB (temperature humidity bias) testing. Excludes the impact of dust, gas phase solvents and other contaminents such as vapors from packaging materials, adhesives, or taptes, etc.
The hysteresis value is the difference between the RH measurement in a rising and falling RH environment, at a specific RH point
Actual response times will vary dependent on system thermal mass and air-flow
Time for the RH output to change by 63% of the total RH change after a step change in environmental humidity
Measurement duration includes the time to measure RH plus Temp
IDD_AVG_EQN = measuruement freq x IDD_ACTIVE x tmeas+ Isleep x (1- (measurement freq x tmeas))
make sure units match eg measureement frequency in Hz, tmeas in seconds, and all the currents in the same unit
Time for the T output to change by 63% of the total T change after a step change in environmental temperature