SI7005-EVB View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

SI7005-EVB

DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR

Silicon Laboratories 

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 – RHValue2  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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