ISL29018
Typical Performance Curves
V SUP (V DDD , V DDA) = 3V, R EXT = 499k Ω
1.2
1.0
SUN
INCANDESCENT
1.2
1.0
AMBIENT
LIGHT
SENSING
HUMAN EYE RESPONSE
IR AND
0.8
PROXIMITY
0.8
HALOGEN
SENSING
0.6
0.6
0.4
0.4
0.2
FLUORESCENT
0.2
0
0
300
400
500
600 700 800
900
1000
1100
-0.2
300
400
500
600 700 800 900
1000
1100
WAVELENGTH (nm)
FIGURE 7. SPECTRUM OF FOUR LIGHT SOURCES
WAVELENGTH (nm)
FIGURE 8. SPECTRAL RESPONSE FOR AMBIENT LIGHT SENSING
AND PROXIMITY SENSING
RADIATION PATTERN
1000
900
V DD = 3V
RANGE = 1000 LUX
INCANDESCENT
65535
LUMINOSITY
ANGLE 40°
30°
20°
10°
10°
20°
30°
40°
800
700
600
16-BIT ADC
HALOGEN
60°
50°
50°
60°
500
400
32768
70°
70°
300
FLUORESCENT
80°
80°
200
100
E cal =
1000 LUX
2 16
x DATA
90°
0.2 0.4 0.6 0.8
RELATIVE SENSITIVITY
90°
1.0
0
0
0
100 200 300 400 500 600 700 800 900 1000
LUX METER READING (LUX)
10000
FIGURE 9. RADIATION PATTERN
FIGURE 10. SENSITIVITY TO THREE LIGHT SOURCES
4500
1000
100
92% BRIGHTNESS PAPER
18% GRAY CARD
4000
3500
3000
2500
2000
I IRLED = 100mA
I IRLED = 50mA
I IRLED = 25mA
I IRLED = 12.5mA
1500
10
ESD BLACK FOAM
1000
500
1
0
20
40 60
80
100
0
0
10
20
30
40 50 60
70
80
90
DISTANCE (mm)
FIGURE 11. ADC OUTPUT vs DISTANCE WITH DIFFERENT OBJECTS
IN PROXIMITY SENSING
15
DISTANCE (mm)
FIGURE 12. ADC OUTPUT vs DISTANCE WITH DIFFERENT LED
CURRENT AMPLITUDES IN PROXIMITY SENSING
FN6619.4
October 8, 2012
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