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SI1133 Datasheet(PDF) 5 Page - Silicon Laboratories |
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SI1133 Datasheet(HTML) 5 Page - Silicon Laboratories |
5 / 43 page 3.2 Ultraviolet (UV) Index Sensing The UV Index is a number linearly related to the intensity of sunlight reaching the earth and is weighted according to the CIE erythema Action Spectrum as shown in Figure 4. This weighting is a standardized measure of human skin's response to different wavelengths of sunlight from UVB to UVA. The UV Index has been standardized by the World Health Organization as shown in the figure below. Figure 3.2. CIE Erythemal Action Spectrum Figure 3.3. UV Index Scale Isolated UV photodiodes that closely match the erythema curve for accurate UV Index measurements. Matching dark current reference photodiodes are also provided to cancel UV photodiode noise. The typical calibrated UV Index sensor response vs. calculated ideal UV Index is shown below for several cloudy and sunny days and at various angles of the sun/time of day. Given the possible variation of the overlay materials above the Si1133, it is generally recommended that outgoing factory calibration be performed at the outgoing test to decrease system-to-system variation. The performance of the Si1133 is best when under a Teflon diffuser while diffuser is within +/- 30 degrees of the sensor view angle. See the plot below. Si1133 Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 0.91 | 4 |
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