Texas Instruments'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 the manufacturing process, such as SMT assembly, PCB board wash, and conformal coating. The tape allows for a full conformal coating of the PCB and includes an adhesive-free corner tab for quick removal using tweezers.
The HDC2021 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 integrated digital features and a heating element to dissipate condensation and moisture. The HDC2021 digital features include programmable interrupt thresholds to provide alerts and system wakeups without requiring a microcontroller (MCU) to continuously monitor the system. Combined with programmable sampling intervals, low power consumption, and 1.8 V supply voltage support, the sensor is designed for ultra-low-power battery-operated systems.
Features 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% (typ.), ±3% (max.) Temperature accuracy: ±0.2°C (typ.), ±0.4°C (max.) Supply voltage range: 1.62 V to 3.6 V I2C interface compatibility Sleep mode current: 50 nA Average supply current: 550 nA (11-bit accuracy option, 1 measurement/s) Continuous conversion or one-shot measurement mode Backward-compatible with HDC2080 Applications Thermostats Smart speakers (with voice assistant) Washers and dryers HVAC sensor transmitters (temperature, pressure, and humidity) HVAC system controllers Wireless environmental sensors
