APDS-9300-020 Datasheet APDS-9300-020 | P19-P21

Appendix A: Window Design Guide

A1: Optical Window Dimensions

To ensure that the performance of the APDS-9300 will not

be aected 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 aect the angular response of the APDS-

9300. 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 in-

ternal reection 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 reection (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 at window

or a at window with light pipe.

Figure A1. Recommended Window Design

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-9300 (see Figure A3) to achieve

better performance. If a at window with a light pipe is

used, dimension D2 should be 1.55mm to optimize the

performance of APDS-9300.

Figure A2. Recommended Window Dimensions

WD: Working Distance between window front panel & APDS-9300

D1: Window Diameter

T: Thickness

L: Length of Light Pipe

D2: Light Pipe Diameter

Z: Distance between window rear panel and APDS-9300

All dimensions are in mm

Top View

APDS-9300

Photo Light Sensor

D2 D1

Table A1. Recommended dimension for optical window

(T+L+Z)

Flat Window

(L=0.0 mm, T=1.0 mm)

Flat window with Light Pipe

(D2=1.55mm, Z =0.5mm, T=1.0mm)

Z D1 D1 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

6.0 5.0 8.50 2.5 4.5

Figure A3. APDS-9300 Light Sensitive Area

Notes:

1. All dimensions are in millimeters

2. All package dimension tolerance in ± 0.2mm unless otherwise specied

A2: Optical Window Material

The material of the window is recommended to be poly-

carbonate. The surface nish 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 A2.

Table A2. Recommended Plastic Materials

Material number

Visible light

transmission Refractive index

Makrolon LQ2647 87% 1.587

Makrolon LQ3147 87% 1.587

Makrolon LQ3187 85% 1.587

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 Limited in the United States and other countries.

AV02-1077EN - March 11, 2008

Appendix B: Application circuit

Figure B1. Application circuit for APDS-9300

The power supply lines must be decoupled with a 0.1 uF

capacitor placed as close to the device package as pos-

sible, as shown in Figure B1. The bypass capacitor should

have low eective series resistance (ESR) and low eec-

tive series inductance (ESI), such as the common ceramic

types, which provide a low impedance path to ground at

high frequencies to handle transient currents caused by

internal logic switching.

Pull-up resistors, R1 and R2, maintain the SDA and SCL

lines at a high level when the bus is free and ensure the

signals are pulled up from a low to a high level within the

required rise time. For a complete description of I

C maxi-

mum and minimum R1 and R2 values, please review the

C Specication at http://www.semiconductors.philips.

com.

A pull-up resistor, R3, is also required for the interrupt

(INT), which functions as a wired-AND signal in a similar

fashion to the SCL and SDA lines. A typical impedance

value between 10 kΩ and 100 kΩ can be used.

APDS-9300

Pin 1: V

Pin 5

Pin 4

Pin 6

Pin 2: GND

0.1uF

Pin 3

** ADDR_SEL

INT

SDA

SCL

Pin 1

Pin 2

MCU

** Note:

ADDR_SEL Float : Slave address is 0111001

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21

APDS-9300-020

Mfr. #:

Buy APDS-9300-020

Manufacturer:

Broadcom / Avago

Description:

Ambient Light Sensors ALPS Light Sensor

Lifecycle:

New from this manufacturer.

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APDS-9300-020