HTS221 Cal. Coeficients

[Remco Kleine]

Posted on March 27, 2018 at 09:03

Hello,

I implemented the software for the HTS221 in my project and all is working. 

But what I find strange is this, some calibration coefficients are negative!

H0_T0_OUT is -2

H1_T0_OUT = -11728

Although they are negative, the reading for temperature is OK  (seems to be < 1 degrees lower than my reference )

But the Humidity reading is 10% off ( too low)

Now in the examples from the datasheet, the coefficients were positive. 

For example my reading of H_T_OUT = - 784. and in the datasheet it is 5000

Why are these coeficients in the s16 format? Can they be really negative? They are like raw ADC value's right?

Regards Remco

[Miroslav BATEK]

Posted on March 29, 2018 at 15:28

Yes, the coefficients can be negative.

What is you reference humidity sensor? 

[Remco Kleine]

Posted on April 04, 2018 at 12:29

My Reference is an Extech RH101 meter.  I have 3 HTS sensors and they are all  10 to15% lower than this reference.