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ISL29013
100,000 lux. If you are operating the ISL29013 at a lower
range/higher gain and detect a zero output, the firmware
TABLE 14. RECOMMENDED DIMENSIONS FOR A FLAT
WINDOW DESIGN
should change the range and recheck the ALS count. One of
two situations will be identified. If the output is nonzero, the
ISL29013 is saturated. If the output remains zero, the
ISL29013 is in a totally dark environment.
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
D TOTAL
1.5
2.0
2.5
3.0
3.5
D1
0.50
1.00
1.50
2.00
2.50
D LENS @ 35
VIEWING ANGLE
2.25
3.00
3.75
4.30
5.00
D LENS @ 45
VIEWING ANGLE
3.75
4.75
5.75
6.75
7.75
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
t=1
d1
D LENS
d TOTAL
Thickness of lens
Distance between ISL29013 and inner edge of lens
Diameter of lens
Distance constraint between the ISL29013 and lens
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.
outer edge
* All dimensions are in mm.
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.
Layout Considerations
The ISL29013 is relatively insensitive to layout. Like other
I 2 C devices, it is intended to provide excellent performance
even in significantly noisy environments. There are only a
few considerations that will ensure best performance.
.
WINDOW LENS
t
Route the supply and I 2 C 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.
ISL29013
?
D LENS
D1
D TOTAL
E=
DATA
2 15
x 2000
? = VIEWING ANGLE
FIGURE 4. FLAT WINDOW LENS
9
FN6485.3
November 11, 2011
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