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sht15最新算法

本站原创 佚名 【字体: 2011/4/27 9:25:53

New Set of Coefficients
The SHTxx sensor output needs  to be converted  into humidity and  temperature values. The Users Guide of  the
datasheets SHT1x, V4.0  and SHT7x, V4.0, Chapter  4.1  each,  give  the  following  formula  for  calculating  relative
humidity values:
 
2
RH 3 RH 2 1 linear
SO c SO c c RH ⋅ + ⋅ + =  (%RH)
 
SORH stands for the digital sensor output – while cx is the set of coefficients. So far the set cx* was specified:
 
SORH  c1*  c2*  c3*
12 bit  -4.0000  0.0405  -2.8000E-6
8 bit  -4.0000  0.6480  -7.2000E-4
 
These coefficients are still applicable for all SHTxx sensors – mainly for the version V3. Production data shows that
there is an optimized set of coefficients cx, that provide more safety margin within the specified limits: