APDS-9008-020 Avago Technologies US Inc., APDS-9008-020 Datasheet - Page 11

• Manufacturer Part Number: APDS-9008-020
• Description: IC PHOTOSENSOR AMBIENT 6CHIPLED
• Manufacturer: Avago Technologies US Inc.
• Type: Ambient Light Photo Sensorr

Specifications of APDS-9008-020

• Package / Case: 6-ChipLED - 1.60mm L x 1.50mm W x 0.55mm H
• Wavelength: 565nm
• Output Type: Analog
• Peak Wavelength: 565 nm
• Maximum Light Current: 52 uA
• Maximum Dark Current: 300 nA
• Maximum Rise Time: 5 ms
• Maximum Fall Time: 5 ms
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Product: Ambient Light Sensor
• Output Current: 40µA
• Sensor Output: Analog
• Supply Voltage Range Dc: 1.6V To 5.5V
• Length/height, External: 0.55mm
• Peak Reflow Compatible (260 C): Yes
• External Width: 1.6mm
• Rise Time: 5ms
• Rohs Compliant: Yes
• External Depth: 1.5mm
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Appendix B. Optical Window Design for APDS-9008
1.0 Optical Window Dimensions
To ensure that the performance of the APDS-9008 will not
be affected by improper window design, there are some
constraints 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-9008.
This minimum dimension that is recommended will en-
sure 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 in-
ternal 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 B1 and B2 illustrate the two types of window that
we have recommended which could either be a flat win-
dow or a flat window with light pipe.
Figure B1. Window Size Determination for Flat Window
Figure B2. Window Design of Flat Window with Light Guide
11
Flat
Table 1 and Figure B3 below show the recommended
dimensions of the window. These dimension values are
based on a window thickness of 1.0mm with a refractive
index 1.585.
Figure B3. Recommended Window Dimensions
WD: Working Distance between window front panel &
D1:
T:
L:
D2:
Z:
Table 1. Recommended dimension for optical window
All dimensions are in mm
The window should be placed directly on top of the photo
sensor to achieve better performance and if a flat window
with a light pipe is used, dimension D2 should be 1.5mm
to optimize the performance of APDS-9008.
WD
WD
(T+L+Z)
1.5
2.0
2.5
3.0
APDS-9008
Window Diameter
Thickness
Length of Light Pipe
Light Pipe Diameter
Distance between window rear panel and
APDS-9008
Light Receving Area
D1
0.5
1.0
1.5
2.0
Z
Flat Window
(L=0.0)
L
Z
APDS-9008
T
2.25
3.25
4.25
5.00
D1
Top View
2.5
D1
(D2=1.5; Z =0.5)
with Light Pipe
-
-
-
Flat window
D2 D1
1.5
L
-
-
-