ISL76671_15 Datasheet, PDF (4/9 Pages) Intersil Corporation – Low Power, <100 Lux Optimized, Analog Output Ambient Light Sensor

ISL76671
POWER SUPPLY
OR
SOURCE METER
V_DD
FUNCTION
GENERATOR
ISL76671
R_EXT
V_OUT
FIGURE 2. TEST CIRCUIT FOR RISE/FALL TIME MEASUREMENT
INPUT
LIGHT
10% 90%
t_R
t_S
OUTPUT
90%
t_F%
10%
t_D
FIGURE 3. TIMING DIAGRAM
Typical Performance Curves V_DD = 3V, T_A = +25°C, R_EXT = 100kΩ, no load at V_OUT, green LED light, unless otherwise
specified.
1.2
1.0
HUMAN EYE RESPONSE
1.0
0.9
0.8
FLUORESCENT
0.8
0.7
0.6
0.6
LIGHT SENSOR RESPONSE
0.5
0.4
0.4
HALOGEN
SUN
INCAND
0.2
0.3
0.2
0.0
0.1
-0.2
300 400
600
800
WAVELENGTH (nm)
1.0k 1.1k
0
350
550
750
950
WAVELENGTH (nm)
FIGURE 4. SPECTRAL RESPONSE
FIGURE 5. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED BY
LUMINOUS INTENSITY (LUX)
RADIATION PATTERN
LUMINOSITY
20° ^{10° 0°}
30°
ANGLE _40°
50°
60°
10° _20°
30°
40°
50°
60°
70°
70°
80°
80°
90°
90°
0.2 0.4 0.6 0.8 1.0
RELATIVE SENSITIVITY
FIGURE 6. RADIATION PATTERN
3.25
3.05
2.85
2.65
2.45
2.25
VOUT + 0.7V
2.05
1.85
1.65
LOW LUX LIMIT
1.45
1.25
0.00001 0.0001 0.001 0.01 0.1 1
LUX
10 100 1000
FIGURE 7. V_DD OPERATING RANGE (WHITE LED)
Submit Document Feedback
4
FN7716.3
April 20, 2015