humidity / temperature sensor HTU21D
humidity / temperature sensor HTU21DF
(with PTFE filter membrane)
HTU21D and HTU21D(F)
The digital HTU21D OEM sensor is a combination of capacitive humidity sensing element and temperature sensor. Each sensor is individually calibrated, compensated for and tested.
The humidity can be measured within a range of 0 to 100% RH. The temperature sensor is designed for a range of -40 to 125°C.
The outputs for humidity and temperature in I²C format are suitable for further data processing using simple, inexpensive microcontrollers. The resolution of the HTU21D can be programmed (8/12 bits to 12/14 bits RH/T).
As the sensor has a low power consumption it is suitable for battery operation, with information on the current battery level provided.
Secure data transmission is ensured by a CLC or cyclic redundancy check. Humidity and temperature signal response times and the recovery time (following full saturation) are within a range of a few seconds.
The HTU21D’s semiconductor components are mounted in a (reflow) solderable 3 x 3 x 0.9 mm3 DFN chip package (dual-flat no-lead).
Variants of the HTU21D
The HTU21D is also available as the optional HTU21D(F) with a PTFE filter membrane to protect it from dust, liquid and contamination.
Pre-assembled sensors on circuit boards in the HTU21D series – the PHTU21D – are also available which can be used as development modules for the OEM humidity sensors.
Analog humidity sensor HTU(F)353X or the digital HTU(F)383X version are also provided as ready-to-use humidity sensor modules based on the HTU.
Features
- Humidity range of 0 to 100% RH
- Temperature range of -40 to +125°C
- Digital I²C interface
- Accuracy of ±2% RH
- Supply voltage of 1.5 to 3.6 V
- Short signal times
- Settable resolution
- Fast recovery time after saturation
- Electrical ID code
- Low power dissipation of 2.7 μW
- Small DFN package
- RoHS and REACH compliant
Applications
- Car cabins
- Household appliances
- Medical equipment
- Electrical devices
- Humidifiers/dehydrators and driers
- Air conditioning systems
- Weather stations
- Security systems
- Multimedia devices (smartphones, tablets)
Download
- HTU21D OEM humidity sensor datasheet
- Software driver fan002 (zip format): Easy interface to the sensor through four public functions (Mail request) (written for the dsPIC33 microcontroller family)
- Application note fan001: HTU2X serial number reading
- Application note fan004: HTU21D – humidity and temperature sensor – assembly and applications
For information on prices and delivery times or if you have any technical questions, please contact info@amsys-sensor.com.