ISL29020_14 Datasheet, PDF (9/11 Pages) Intersil Corporation – A Low Power, High Sensitivity, Light-to Digital Sensor With I2C Interface

ISL29020
Typical Performance Curves (V_DD = 3V, R_EXT = 500kΩ)
1.2
1.0
SUN
0.8
HALOGEN
0.6
INCANDESCENT
0.4
FLUORESCENT
0.2
0
300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 7. SPECTRAL RESPONSE OF LIGHT SOURCES
1.2
HUMAN EYE
1.0
0.8
0.6
0.4
IR SENSING
0.2
0
AMBIENT LIGHT SENSING
-0.2
300 400 500 600 700 800 900
WAVELENGTH (nm)
1000 1100
FIGURE 8. SPECTRAL RESPONSE FOR AMBIENT LIGHT
SENSING AND IR SENSING
RADIATION PATTERN
LUMINOSITY
20° ^{10° 0°}
30°
ANGLE _40°
50°
10° _20°
30°
40°
50°
60°
60°
70°
70°
80°
80°
90°
90°
0.2 0.4 0.6 0.8 1.0
RELATIVE SENSITIVITY
FIGURE 9. RADIATION PATTERN
1000
900
800
ALS SENSING
RANGE 1 (1k Lux)
16-BIT ADC
INCANDESCENT
65535
700
HALOGEN
600
500
32768
400
FLUORESCENT
300
200
100
0
0
1000 LUX
E_cal = ₂₁₆ x DATA
0
100 200 300 400 500 600 700 800 900 1000
LUX METER READING (LUX)
FIGURE 10. SENSITIVITY TO THREE LIGHT SOURCES
10
0 lux
8
6
4
2
0
-60
-20
20
60
100
TEMPERATURE (°C)
FIGURE 11. OUTPUT CODE FOR 0 LUX vs TEMPERATURE
1.10
300 Lux FLUORESCENT LIGHT
ALS SENSING
1.05 ^{RANGE 1 (1k Lux)}
1.00
0.95
0.90
-60
-20
20
60
100
TEMPERATURE (°C)
FIGURE 12. OUTPUT CODE vs TEMPERATURE
9
FN6505.1
August 20, 2009