isl29013 Intersil Corporation, isl29013 Datasheet - Page 9

• Manufacturer Part Number: isl29013
• Description: Light-to-digital Output Sensor With High Sensitivity, Gain Selection, Interrupt Function And I2c Interface
• Manufacturer: Intersil Corporation

.
WINDOW LENS
ISL29013
E =
DATA
ISL29013
2
15
L
t
x 2000
FIGURE 4. FLAT WINDOW LENS
D
D
LENS
2
9
!1.5mm
D
‡
LENS
‡ = VIEWING ANGLE
FIGURE 5. WINDOW WITH LIGHT GUIDE/PIPE
D1
t
LIGHT PIPE
D
TOTAL
ISL29013
Window with Light Guide Design
If a smaller window is desired while maintaining a wide
effective viewing angle of the ISL29013, 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.
t = 1
d1
D
d
* All dimensions are in mm.
TABLE 14. RECOMMENDED DIMENSIONS FOR A FLAT
TOTAL
D
LENS
TOTAL
1.5
2.0
2.5
3.0
3.5
Thickness of lens
Distance between ISL29013 and inner edge of lens
Diameter of lens
Distance constraint between the ISL29013 and lens
outer edge
WINDOW DESIGN
0.50
1.00
1.50
2.00
2.50
D1
VIEWING ANGLE
D
LENS
2.25
3.00
3.75
4.30
5.00
@ 35
D
2
VIEWING ANGLE
D
LENS
February 13, 2008
3.75
4.75
5.75
6.75
7.75
D
LENS
@ 45
FN6485.0