ISL29013 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

ISL29013

Light-to-Digital Output Sensor with High Sensitivity, Gain Selection, Interrupt Function and I2C Interface

Renesas Electronics 

ISL29013

Unstable Ambient Light Condition

The ISL29013 sequentially measures the difference in the

output of two diodes. That's suitable since most changes in

ambient light are gradual and any difference between the

ambient light conditions for D1 and D2 are negligible. However,

it is possible to cause an abrupt change in brightness with a

fast-moving hand over the sensor or passing a tree shadow in

a fast moving car. To handle these anomalies, we suggest

comparing several sequential readings and discarding any

data with sudden changes.

Flat Window Lens Design

A window lens will surely limit the viewing angle of the

ISL29013. The window lens should be placed directly on top of

the device. The thickness of the lens should be kept at

minimum to minimize loss of power due to reflection and also

to minimize loss of loss due to absorption of energy in the

plastic material. A thickness of t = 1mm is recommended for a

window lens design. The bigger the diameter of the window

lens the wider the viewing angle is of the ISL29013. Table 14

shows the recommended dimensions of the optical window to

ensure both 35° and 45° viewing angle. These dimensions are

based on a window lens thickness of 1.0mm and a refractive

index of 1.59.

.

WINDOW LENS

Suggested PCB Footprint

It is important that the users check the “Surface Mount

Assembly Guidelines for Optical Dual FlatPack No Lead

(ODFN) Package” before starting ODFN product board

mounting.

http://www.intersil.com/data/tb/TB466.pdf

Layout Considerations

The ISL29013 is relatively insensitive to layout. Like other I2C

devices, it is intended to provide excellent performance even in

significantly noisy environments. There are only a few

considerations that will ensure best performance.

Route the supply and I2C traces as far as possible from all

sources of noise. Use two power-supply decoupling capacitors,

4.7µF and 0.1µF, placed close to the device.

t

DTOTAL



D1

ISL29013

DLENS

E=

DATA

215

x

2000

 = VIEWING ANGLE

FIGURE 4. FLAT WINDOW LENS

TABLE 14. RECOMMENDED DIMENSIONS FOR A FLAT

WINDOW DESIGN

DTOTAL

1.5

D1

0.50

DLENS @ 35

VIEWING ANGLE

2.25

DLENS @ 45

VIEWING ANGLE

3.75

2.0

1.00

3.00

4.75

2.5

1.50

3.75

5.75

3.0

2.00

4.30

6.75

3.5

2.50

5.00

7.75

t=1

d1

DLENS

dTOTAL

Thickness of lens

Distance between ISL29013 and inner edge of lens

Diameter of lens

Distance constraint between the ISL29013 and lens

outer edge

* All dimensions are in mm.

FN6485 Rev 3.00

November 11, 2011

Page 9 of 14

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