HDC3020
SNAS778 – JUNE 2021
HDC302x High-Accuracy, Low-Power, Digital Humidity and Temperature Sensor With
Ultra-Low Drift
1 Features
3 Description
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Relative humidity (RH) sensor:
– Operating range: 0% to 100%
– Accuracy: ±1.5% typical
– Drift Correction: reduces offset to return device
to within accuracy specification
– Long-term drift: 0.21%RH/yr
– Condensation protection with integrated heater
Temperature sensor:
– Operating range: -40°C to 125°C
– Accuracy: ±0.1°C typical
NIST traceability: Relative humidity & temperature
Low power: average current 0.7 µA
I2C interface compatibility up to 1-Mhz speeds
– Four selectable I2C addresses
– Command/data protection through CRC
checksum
The HDC302x is an integrated capacitive based
relative humidity (RH) and temperature sensor, which
provides high accuracy measurements over a wide
supply range (1.62 V – 5.5 V), along with ultra-low
power consumption in a compact 2.5-mm × 2.5-mm
package. Both the temperature and humidity sensors
are 100% tested and trimmed on a production setup
that is NIST traceable and verified with equipment that
is calibrated to ISO/IEC 17025 standards.
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Drift Correction reduces RH sensor offset due to
aging, exposure to extreme operating conditions, and
contaminants to return device to within accuracy
specifications. For battery IoT applications, auto
measurement mode and ALERT feature enable low
system power by maximizing MCU sleep time. There
are four different I2C addresses that support speeds
up to 1 MHz. A heating element is available to
dissipate condensation and moisture.
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Supply voltage: 1.62 V to 5.50 V
Available auto measurement mode
Programmable interrupts
Programmable measurement calibration
Factory-installed polyimide tape assembly cover
Factory-installed IP67 rated environmental cover
The HDC3020 comes in an open cavity package
without a protective cover. Two device variants have
a cover option to protect the open cavity RH sensor:
HDC3021 and HDC3022. HDC3021 has removable
protective tape to allow conformal coatings and
PCB wash. HDC3022 has a permanent IP67 filter
membrane cover to protect against dust and water.
2 Applications
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Washer & dryer
Refrigerator & freezer
Industrial transport
Cold Chain asset tracking & data logger
IoT environmental sensors
Air quality and gas detection
Humidifier/dehumidifier
Thermostat
CPAP and ventilator
Water leak detector
IP Camera
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
HDC3020
HDC3021(2)
HDC3022(2)
WSON (8)
2.50 mm × 2.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
(2) Preview only.
3.30 V
HDC3
VDD
VDD
SCL
SDA
I2C
Controller
Calibration
ADC
ALERT
ADDR
ADDR1
I2C
GPIO
RH Sensor
T Sensor
Linearization
µC
RESET
GND
GND
Typical Application
Typical RH Accuracy vs. RH Setpoint (TA = 25°C)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change
without notice.
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