APDS-9303-020 Avago Technologies US Inc., APDS-9303-020 Datasheet - Page 19

• Manufacturer Part Number: APDS-9303-020
• Description: PHOTO SENSOR AMB SMBUS 6CHIPLED
• Manufacturer: Avago Technologies US Inc.
• Type: Ambient Light Sensor with Digital Outputr

Specifications of APDS-9303-020

• Peak Wavelength: 640 nm
• Maximum Rise Time: 300 ns
• Maximum Fall Time: 300 ns
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 30 C
• Product: Ambient Light Sensor
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Appendix A: Window Design Guide
A1: Optical Window Dimensions
To ensure that the performance of the APDS-9303 will not
be affected by improper window design, there are some
criteria requested on the dimensions and design of the
window. There is a constraint on the minimum size of the
window, which is placed in front of the photo light sensor,
so that it will not affect the angular response of the APDS-
9303. This minimum dimension that is recommended will
ensure at least a ±35° light reception cone.
If a smaller window is required, a light pipe or light guide
can be used. A light pipe or light guide is a cylindrical piece
of transparent plastic, which makes use of total internal
reflection to focus the light.
The thickness of the window should be kept as minimum
as possible because there is a loss of power in every optical
window of about 8% due to reflection (4% on each side)
and an additional loss of energy in the plastic material.
Figure A1 illustrates the two types of window that we
have recommended which could either be a flat window
or a flat window with light pipe.
Figure A1. Recommended Window Design
19
Table A1 and Figure A2 show the recommended dimen-
sions of the window. These dimension values are based
on a window thickness of 1.0mm with a refractive index
1.585.
The window should be placed directly on top of the light
sensitive area of APDS-9303 (see Figure A3) to achieve
better performance. If a flat window with a light pipe is
used, dimension D2 should be 1.55mm to optimize the
performance of APDS-9303.
Figure A2. Recommended Window Dimensions
WD: Working Distance between window front panel &
D1: Window Diameter
T:
L:
D2: Light Pipe Diameter
Z:
WD
Ambient Light Sensor
APDS-9303
Thickness
Length of Light Pipe
Distance between window rear panel and
APDS-9303
D2
D1
APDS-9303
Z
L
T
Top View
D2 D1