To be exact, a word „sensors“ is not a suitable expression in this case. As SHT series sensors contain on one chip humidity and temperature sensor, precise supply, low noise linear amplifier, AD converter and a serial interface, they represent a ready-made “device”. Moreover, they´re calibrated, thus to get an exact value it´s only necessary to read out data through a serial interface. In case of SHT2x series, it´s a standard, easy-to-implement I2C interface.
Sensirion sensors SHT2x series was more in detail introduced to you in our article „New sensors Sensirion will take you only 3x3mm on PCB!", that´s why we´d like to bring you mainly few tips for simplification of development now.
Area of relative humidity and physics of water vapors is quite ample and into its introduction will initiate you the document Introduction_to_Relative_Humidity. Don´t be scared of many quotations, which you´ll find there - fortunately in common praxis we usually manage it with values of relative humidity and a dew point, which can be found together with code examples in Humidity_at_a_Glance.
As humidity sensors are very often used in residential places for regulation of heating and ventilation, also useful can be information about influence of humidity on a thermal comfort.
For a practical usage of sensors it´s also important their placement on a PCB and a good access of air, what is in detail described in the document Sensirion_Humidity_Design_Guide. SHT2x are intended for 3VDC power supply, that´s why when using in 5V applications, you can face a problem of different voltage levels. This can be easily solved for example by a circuit described in the document SHT2x_5V_Supply_Embedding.
The program itself doesn´t need to be developed “from zero”. Examples can be found in the document SHT21_Sample_Code and SHT2x_Electronic_Identification_Code. Detailed information about testing and specification of SHT sensors can also be found in documents Sensirion_Humidity_Sensor_Specification_Statement and Sensirion_Humidity_Testing_Guide.
For further information about Sensirion products please contact us at sales@soselectronic.com.
- relative humidity and temperature measurment in one component
- individually calibrated in a precise humidity chamber
- extremely compact dimensions 3 x 3 x 1,1 mm
- digital outpt with I2C interface (Hold/No Hold Master)
- outstanding reliability and long-term stability
- 12 bit resolution for relative humidity and 14 bits for temperature
- measuring range 0-100% RH,-40 to +125 °C
- average consumption only 3.2 uW at 1 measurement per sec/8 bit/RH (SHT2x)
- average consumption only 3.2 uW at 1 measurement per sec/11 bit/Temp. (STS21)
- insensitivity to external disturbances (EMC)
- SMT package DFN3-0, reflow solderable
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