General Description
The HTU21D peripheral module provides the necessary hardware to interface the HTU21D digital relative humidity and temperature sensor to any system that utilizes Pmod compatible expansion ports configurable for I2C communication. The HTU21D sensor is a self-contained humidity and temperature sensor that is fully calibrated during manufacture. The sensor can operate from 1.5V to 3.6V, has selectable resolution, low battery detect, and checksum capability. The HTU21D has a low current stand-by mode for power-sensitive applications.

Specifications
• Measures relative humidity from 0% to 100%
• Measures temperature from -40°C to 125°C
• Humidity resolution selectable from 8 to 12 bits
• Temperature resolution selectable from 11 to 14 bits
• 0.14 µA sleep current
• 500 µA operating current (during measurement only)
• ±3% accuracy

FEATUREs
• 12-pin Pmod compatible connector
• I2C interface
• Secondary 12-pin connector allows daisy chain
• FPGA fabric available for download
• µC C code available for download
• Built-in heater to remove condensation
• Available with PTFE environmental filter over the sensor
• Electronic ID code stored on chip