Product news

AMSYS presents the new digital miniaturized humidity and temperature sensors of the HTU31D series from TE Connectivity in a 6-pin DFN housing (2.5 x 2.5. x 0.9 mm³). The new version features a faster response time, low hysteresis, and better accuracy at extreme temperatures from -40 °C to 125 °C and humidity from 0 %RH - 100 %RH.
The humidity sensors consist of a capacitive measuring cell, an integrated temperature sensor and an evaluation circuit (ASIC). This ASIC enables the capacitive signal to be converted into a DC voltage and digitizes the signal in an internal ADC. The temperature is also recorded and digitized. The resolution for the humidity and temperature values can be set from 0.020 - 0.007 %RH and 0.040 - 0.012 °C via the OSR register. Depending on the resolution, the conversion time for humidity is 1 - 7.8 ms and for temperature 1.6 - 12.1 ms. A diagnostic register is also available to check whether the values for humidity and temperature are outside the specified range.
Each sensor is individually tested, calibrated, temperature compensated and complies with the AEC Q100 quality level 1 standard. This enables an accuracy of typically ±2 %RH in the measuring range of 20 - 100 %RH @25 °C to be achieved. The temperature accuracy is ± 0.2 °C. The sensor is suitable for a humidity measuring range of 0 - 100 %RH and for the extended temperature measuring range of -40 - 125 °C.
The long-term measurement drift of the sensor is less than 0.25 %RH and only 0.04 °C per year. Due to this high long-term stability, a low hysteresis of ±0.7 %RH and the almost linear characteristic curve, the humidity sensor offers excellent properties for use in demanding applications.
With the digital HTU31D, AMSYS offers a new humidity sensor with a wide supply voltage range from 3 to 5.5 V. The I2C clock frequency can be up to a maximum of 10 MHz. The sensor also has two configurable I2C addresses. The typical power dissipation at one measurement per second is approx. 3.78 µW at 5 V supply @25 °C.
These humidity sensors can be used in many different areas, e.g. in HVAC technology, the automotive industry, medical and biotechnology, for mold and corrosion prevention, in device monitoring and for humidification and drying control.