HPP845 - TE Connectivity digital and analog humidity sensors. Free Technical Library News

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HPP845 - digital and analog humidity sensors TE Connectivity

10.09.2019

The HPP845 series (HTU21D(F)/HTU20D(F)) are TE Connectivity's "plug and play" temperature and humidity combo sensors for OEM applications where reliable and accurate measurements are required. Each internal sensor is calibrated and tested individually. The microcircuit has a unique serial number that can be read by a special command. To improve the reliability of the transmitted data, the CRC-8 checksum functionality is supported.

An additional membrane filter (optional) protects the sensors from dust and water ingress while maintaining a fast response time. This membrane provides protection in accordance with the IP67 standard.

Digital sensors provide calibrated, linearized signals via an I?C interface. The resolution of digital humidity sensors can be changed on command (from 8/12 bits up to 12/14 bits for RH/T).

The analog version of the sensor outputs a PWM signal with a base frequency of 120 Hz on the SDA line. The SCL pin is used as a data type switch input - humidity or temperature (SCK up - RH, SCK down - T ). Measurements are taken twice per second. The PWM output signal can be easily converted to DC voltage with a low pass filter.

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