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ESCRIPTION To start the TSL2550EVM software, click: Start -> Programs -> TSL2550EVM -> TSL2550 Evaluation Module. See Figure 3 regarding a sample screen capture of the software. The EVM application constantly monitors the ambient light level through the use of two photodiodes on the TSL2550. One of the photodiodes (Channel 0) is sensitive to both visible and infrared light, while the second photodiode (Channel 1) is sensitive primarily to infrared light. An integrating ADC converts the photodiode currents to Channel 0 and Channel 1 digital outputs. Channel 1 digital output is used to compensate for the effect of the infrared component of light on the Channel 0 digital output. Figure 3. TSL2550 EVM Application

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QUATION The TSL2550 is designed for use with broad wavelength light sources, and the formula to obtain illuminance describes a best fit curve for fluorescent, incandescent, and sunlight ambient conditions to approximate the human eye response.
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