ISL29012IROZ-EVALZ datasheet(9/15 Pages) INTERSIL

No de pièce	ISL29012IROZ-EVALZ

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

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Fabricant	INTERSIL [Intersil Corporation]

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9

FN6476.1

December 10, 2008

saturation (Figure 18). When using the ISL29012 in high lux

applications, one can reduce the REXT value and select

Range4, the lowest gain to avoid saturation. For example,

REXT = 25kΩ is recommended with ambient light near

100,000 lux. If you are operating the ISL29012 at a lower

range/higher gain and detect a zero output, the firmware

should change the range and recheck the ALS count. One of

two situations will be identified. If the output is non-zero, the

ISL29012 is saturated. If the output remains zero, the

ISL29012 is in a totally dark environment.

ALS Range For Various Light Sources

Figure 9 shows spectrum response of various light sources.

Fluorescent has little IR content while sunlight, halogen and

incandescent light have large IR content. Since both the

internal photo diodes D1 and D2 are sensitive to IR

spectrum, they saturate at a higher level for the fluorescent

light source in comparison to the other 3 light sources. This

effect is shown in Figure 22.

Unstable Ambient Light Condition

The ISL29012 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

ISL29012. 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 ISL29012.

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 with Light Guide Design

If a smaller window is desired while maintaining a wide

effective viewing angle of the ISL29012, a cylindrical piece of

transparent plastic is needed to trap the light and then focus

and guide the light on to the device. Hence, the name light

guide or also known as light pipe. The pipe should be placed

directly on top of the device with a distance of d1 = 0.5mm to

achieve peak performance. The light pipe should have a

minimum of 1.5mm in diameter to ensure that whole area of

the sensor will be exposed. See Figure 5.

TABLE 14. RECOMMENDED DIMENSIONS FOR A FLAT

WINDOW DESIGN

DTOTAL

D1

DLENS @ 35°

VIEWING ANGLE

DLENS @ 45°

VIEWING ANGLE

1.5

0.50

2.25

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

Thickness of lens

d1

Distance between ISL29012 and inner edge of lens

DLENS

Diameter of lens

dTOTAL

Distance constraint between the ISL29012 and lens

outer edge

* All dimensions are in mm.

DLENS

∅

t

D1

DTOTAL

∅ = VIEWING ANGLE

WINDOW LENS

ISL29012

FIGURE 4. FLAT WINDOW LENS

E =

DATA

215

x 2000

ISL29012

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