ISL29004 Datasheet, PDF (12/17 Pages) Intersil Corporation – Light-to-Digital Output Sensor with Address Selection, High Sensitivity, Gain Selection, Interrupt Function and I2C Interface

ISL29004
dimensions are based on a window lens thickness of 1.0mm
and a refractive index of 1.59.
WINDOW LENS
t
∅
D_TOTAL
D1
ISL29003/4
D_LENS
∅ = VIEWING ANGLE
FIGURE 4. FLAT WINDOW LENS
TABLE 16. RECOMMENDED DIMENSIONS FOR A FLAT
WINDOW DESIGN
D_TOTAL
1.5
D_LENS @ 35
D_LENS @ 45
D1
VIEWING ANGLE VIEWING ANGLE
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
D1
D_LENS
D_TOTAL
Thickness of lens
Distance between ISL29001 and inner edge of lens
Diameter of lens
Distance constraint between the ISL29001 and lens
outer edge
* All dimensions are in mm.
Window with Light Guide Design
If a smaller window is desired while maintaining a wide
effective viewing angle of the ISL29004, 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
minimum of 1.5mm in diameter to ensure that whole area of
the sensor will be exposed. See Figure 5.
D_LENS
D₂ > 1.5mm
LIGHT PIPE
t
L
D₂
D_LENS
ISL29003/ISL29004
FIGURE 5. WINDOW WITH LIGHT GUIDE/PIPE
12
FN6221.0
December 21, 2006