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Test Setup for Ambient Light Sensor Testing - App Note

From Avago Technologies
 

 
This document provides a general recommendation for testing the functionality of the ambient light sensor. It covers the measurement equipment and techniques for determining the output voltage (Vout) of the ambient light sensor. * The LEDs used are recommended to have a wide viewing angle so that the light will be more uniform across angle. * LEDs with a high light intensity are preferred as the diffuser may cause a significant attenuation of the light. * The LEDs are recommended to be placed in close proximity to each other to allow for a more uniform light distribution across angle. In other words, the distance, D should be as small as possible. * Example of the recommended LEDs is extra bright flat top white LED lamp from Avago Technologies (Part no: HLMP-FW67NP00). It has a viewing angle of 85° and a minimum intensity of 680 mcd at 20 mA. * The power supply to the LEDs can be varied to obtain the required lux value for measurement as measured by the lux meter.
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LED mounts and lenses are used to mount LEDs and shape or transfer light output. Other components in this area include LED light pipes, headers, interconnects, and assemblies. Search by Specification | Learn more about LED Mounts and Lenses
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LED lamps are light emitting diode arrays with traditional lamp ballasts. Learn more about LED Lamps
Lamps are light sources that emit incoherent light for illumination. There are many different types of products. Examples include fluorescent lamps, halogen lamps, heat lamps, incandescent lamps, LED lamps, projection lamps, spectral lamps, and stage lamps. Specialized and proprietary lamps are also available. Search by Specification | Learn more about Lamps
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