SI7005-B-FM View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
MFG CO.
'SI7005-B-FM' PDF : 40 Pages View PDF
Si7005
4.3. Linearization
Capacitive relative humidity sensors require linearization. The Si7005 accuracy specification (Table 4) applies after
correction of non-linearity errors. The recommended linearization technique is to correct the measured relative
humidity value with a 2nd order polynomial; the linear relative humidity (RH) value is calculated as follows:
RHLinear = RHValue – RHValue2 A2 + RHValue A1 + A0
Where:
RHLinear is the corrected relative humidity value in %RH
RHValue is the uncorrected (measured) relative humidity value in %RH
A2, A1, and A0 are unit-less correction coefficients derived through characterization of Si7005s by Silicon
Laboratories; their values depend on whether compensation for a typical solder reflow is required
The values for the correction coefficients are shown in Table 10.
Table 10. Linearization Coefficients
Coefficient
A0
A1
A2
Value
–4.7844
0.4008
–0.00393
Rev. 1.3
15
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