UG163 Datasheet, PDF (10/25 Pages) Silicon Laboratories – Si1133/Si1153 Optical Sensor Evaluation Board Users Guide

UG163: Si1133/Si1153 Optical Sensor Evaluation Board User's Guide
The Five Sensors on the EVB
3.2 Long Range Proximity
The Si1153-AA09 2X2 mm proximity sensing chip with an on-die 940 nm bandpass filter for sunlight immunity. The Board demonstrates
the use of a 5 mm dia. lens and arrow angle LED.
The 940 nm filter on the die and external LED are selected to coincide with a dip in solar energy that occurs around 940 nm. One gets
the advantage of rejecting visible and IR light by a couple of orders of magnitude and operating in a safe area with minimal sun energy.
The lens is designed to give the sensor a roughly ±5 degree field of view and so is the lensed LED chosen and mounted next to it on
the PCB.
Figure 3.3. Lens Used for Long-Range Sensor
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