Low-power humidity and temperature digital sensor with protective cover


Product details


Relative humidity accuracy (Typ) (%RH) ±2 Temperature accuracy (Typ) (°C) ±0.2 Relative humidity operating range (Typ) (%RH) 0 - 100 Supply voltage (Min) 1.62 Supply voltage (Max) 3.6 Average supply current (Typ) (uA) 0.55 @ 1 sample / sec Operating temperature range (C) -40 to 125 Interface type Digital Rating Catalog open-in-new Find other Humidity sensors


  • Factory-installed polyimide tape to protect sensor during assembly
  • RH measurement range: 0% to 100%
  • Temperature measurement range: –40°C to 125°C
  • Humidity accuracy: ±2% (typical), ±3% (maximum)

  • Temperature accuracy: ±0.2°C (typical), ±0.4°C (maximum)

  • Supply voltage range: 1.62 V to 3.6 V
  • I2C interface compatibility
  • 50 nA sleep mode current
  • 550 nA average supply current (11-bit accuracy option, 1 measurement/second)
  • Continuous conversion or one-shot measurement mode

  • Backward-compatible with HDC2080

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The HDC2021 is an integrated relative humidity and temperature sensor with a factory-installed polyimide tape cover over the opening of the relative humidity sensor element. The tape cover provides protection against pollutants that can appear in certain stages of the manufacturing process, such as SMT assembly, PCB board wash, and conformal coating. The tape design allows for a full conformal coating of the PCB, and includes an adhesive free corner tab for quick removal using tweezers.

The device is backward-compatible with the HDC2080, providing high accuracy measurements with very low power consumption in a small DFN package. The capacitive-based sensor includes new integrated digital features and a heating element to dissipate condensation and moisture. The digital features include programmable interrupt thresholds to provide alerts and system wake-ups without requiring a microcontroller to continuously monitor the system. Combined with programmable sampling intervals, low power consumption, and 1.8-V supply voltage support, the is designed for ultra-low power battery-operated systems.

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Technical documentation

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Type Title Date
* Datasheet HDC2021 High-Accuracy, Low-Power Humidity and Temperature Sensor datasheet (Rev. A) Jun. 26, 2020
Technical articles Exploring advancements in industrial and automotive markets with 60-GHz radar Aug. 03, 2020
User guides HDC2022EVM User's Guide Dec. 20, 2019
Technical articles Understanding tamper detection sensors Nov. 18, 2019
Application notes Programming the HDC20X0 Devices Aug. 29, 2018
Technical articles Why capacitive isolation: a vital building block for sensors in smart cities Jan. 16, 2018
Application notes Humidity Sensor: Storage and Handling Guidelines Aug. 28, 2017
Application notes Optimizing Placement and Routing for Humidity Sensors (Rev. A) Mar. 06, 2017
Technical articles Time-of-flight measurements using high-performance time-to-digital converters Jul. 31, 2015

Design & development

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Hardware development

document-generic User guide
The HDC2080EVM (evaluation module) is an easy to use, plug-and-play, platform for evaluating the functionality and performance of the HDC2080 humidity and temperature sensor.  The EVM utilizes a USB interface with MSP430F5528 microcontroller to establish communication between the HDC2080 device (...)
  • Streaming relative humidity and temperature measurements
  • Data logging
  • Full register access
  • USB plug & play
  • Detachable sensor section for prototype remote operation

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