Digital Temperature and Humidity Sensor - HTU21A

Product Specification

RH/T Sensor IC, Digital Humidity Sensor with Temperature Output- HTU21A

HTU21A Digital Temperature and Humidity Sensor Description: 

The HTU21A(F) is a new digital humidity sensor with temperature output by MEAS. Setting new standards in terms of size and intelligence, it is embedded in a reflow solderable Dual Flat No leads (DFN) package with a small 3 x 3 x 0.9 mm footprint. This sensor provides calibrated, linearized signals in digital, I2C format.

HTU21A(F) digital humidity sensors are dedicated humidity and temperature plug and play transducers for OEM applications where reliable and accurate measurements are needed. the HTU21A(F) shows maximum performance on an extended band of relative humidity compared to HTU21D(F). Direct interface with a micro-controller is made possible with the module for humidity and temperature digital outputs.

These low power sensors are designed for high volume and cost sensitive applications with tight space constraints. Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out by command. Low battery can be detected and a checksum improves communication reliability.

The resolution of these digital humidity sensors can be changed by command (8/12bit up to 12/14bit for RH/T). With MEAS’ improvements and miniaturization of this sensor, the performance-to-price ratio has been improved – and eventually, any device should benefit from its cutting edge energy saving operation mode. Optional PTFE filter/membrane (F) protects HTU21A digital humidity sensors against dust and water immersion, as well as against contamination by particles. PTFE filter/membranes preserve a high response time. The white PTFE filter/membrane is directly stuck on the sensor housing.

HTU21A Digital Temperature and Humidity Sensor Features:

Full interchangeability with no calibration required in standard conditions

Instantaneous desaturation after long periods in saturation phase

Compatible with automatized assembly processes, including Pb free and reflow processes

Individual marking for compliance to stringent traceability requirements

DFN type package

Relative Humidity and Temperature Digital Output, I2C interface

Fully calibrated
Lead free sensor, reflow solderable
Low power consumption
Fast response time
Automotive application specific

HTU21A Digital Temperature and Humidity Sensor Applications: 

Windscreen defogging, Air intake, Passenger cars or heavy duty vehicles