The HDC3022DEJR is a combined humidity and temperature sensor from Texas Instruments, part of the HDC3x family. It outputs 16-bit digital data over an I²C bus, with a typical accuracy of 1.5% RH — this is the headline spec that determines fit for environmental monitoring loops.
4 ms response time — fast enough for condensation detection
The 4 ms response time covers a step change in humidity — fast enough for closed-loop HVAC damper control or condensation detection on a cold surface. For applications that poll at 10 Hz or slower, the sensor's settling time is negligible. The I²C interface runs at standard and fast-mode rates; no dedicated clock line beyond the bus master's SCL is needed. The 16-bit output gives 0.005% RH resolution per LSB at the typical accuracy level.