APDS-9003-022 Datasheet APDS-9003-020, APDS-9003-022 | P10-P12

Table 1 and Fgure 6 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 6: Recommended Window Dimensions

WD: Working Distance between window front panel

& APDS-9003

D1: Window Diameter

T: Thickness

L: Length of Light Pipe

D2: Light Pipe Diameter

Z: Distance between window rear panel and APDS-

9003

Appendix B: Optical Window Design for APDS-9003

2.0 Optical Window Dimensions

To ensure that the performance of the APDS-9003 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-

9003. 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 5a and 5b illustrate the two types of window that

we have recommended which could either be a flat

window or a flat window with light pipe.

Figure 5(a): Window Size Determination for Flat Window

Figure 5(b): Window Design of Flat Window with Light Guide

Top View

D2 D1

APDS-9003

Light Receving Area

(T+L+Z)

Flat Window

(L=0.0)

Flat window with Light Pipe

(D2=1.5; Z =0.5)

ZD1D1 L

1.5 0.5 2.25 - -

2.0 1.0 3.25 - -

2.5 1.5 4.25 - -

3.0 2.0 5.00 2.5 1.5

Material number Visible light transmission Refractive index

Makrolon LQ2647 87% 1.587

Makrolon LQ3147 87% 1.587

Makrolon LQ3187 85% 1.587

Table 2: Recommended Plastic Materials

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-9003.

2.1 Optical Window Material

The material of the window is recommended to be

polycarbonate. The surface finish of the plastic should be

smooth, without any texture.

The recommended plastic material for use as a window is

available from Bayer AG and Bayer Antwerp N. V. (Europe),

Bayer Corp.(USA) and Bayer Polymers Co., Ltd. (Thailand),

as shown in Table 2.

Table 1: Recommended dimension for optical window

For product information and a complete list of distributors, please go to our web site: www.avagotech.com

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Pte. in the United States and other countries.

AV01-0238EN - June 8, 2006

Appendix C: General Application Guide for APDS-9003

The APDS-9003 is a low cost analog-output ambient light

photo sensor whose spectral response closely emulates

the human eyes. APDS-9003 consists of a photo sensor

that is able to produce a high gain photo current to a

sufficient level that can be converted to voltage with a

standard value of external resistor. APDS-9003 can easily

be integrated into systems that use ADC input which is

available for sampling of the external source, as shown in

figure 7 below.

The amount of converted voltage, Vout, is mainly

dependant proportionally on the photo current which

generated by the brightness of the light shone on the

photo sensor and the load resistor used, R

. Increasing

the brightness of the light or/and the load resistor will

increase the output voltage.

Brightness is measured as “LUX” unit, which describes

how intense a light source that our eyes perceive. LUX

meter is the equipment for “LUX” measurement. Light

sources with the same LUX level appear at the same

brightness to the human eyes.

Figure 7: Configuration of APDS-9003

APDS-9003

A/D

micro-

controller

2,3,4,5

Vcc

Vout

Light Source

Selection of the load resistor R

will determine the amount

of current-to-voltage conversion in the circuit. APDS-

9003 allows a saturation output voltage of typically 2.32V

@ VCC=3V.

Light source e.g. fluorescent light consists of ac noise

frequency of about 100Hz. A capacitor of 10uF, which act

as a low-pass filter, is recommended to add in parallel

with the load resistor to reduce the ripples.

P1-P3 P4-P6 P7-P9 P10-P12

APDS-9003-022

Mfr. #:

Buy APDS-9003-022

Manufacturer:

Broadcom / Avago

Description:

SENSOR OPT 620NM AMB 6CHIPLED

Lifecycle:

New from this manufacturer.

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APDS-9003-022

APDS-9003-022

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