Amsys - Model HTU21D -Digital Humidity/Temperature Sensor

HTU21D and HTU21D(F)

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.

• 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

• Car cabins
• Household appliances
• Medical equipment
• Electrical devices
• Humidifiers/dehydrators and driers
• Air conditioning systems
• Weather stations
• Security systems
• Multimedia devices (smartphones, tablets)