ISL29009 Ver la hoja de datos (PDF) - Intersil
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ISL29009 Datasheet PDF : 7 Pages
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ISL29009
Application Information
Light-to-Current and Voltage Conversion
The ISL29009 has responsiveness that is a square-root
function of the light intensity intercepted by the photodiode in
lux. Because the photodiode has a responsivity that
resembles the human eye, conversion rate is independent of
the light source (fluorescent light, incandescent light or direct
sunlight).
IOUT
=
----1---.--8----μ----A-----
100 l u x
E
(EQ. 1)
Here, IOUT is the output current in µA, and E is the input light
in lux.
A load resistor RL is added to convert IOUT into VOUT. The
output voltage can be expressed in Equation 2:
VOUT
=
IOUT × RL
=
----1---.--8----μ----A-----
100 l u x
E × RL
(EQ. 2)
Here, VOUT is the output voltage and RL is the value of the
load resistor added. The compliance of the ISL29009's
output circuit may result in premature saturation of the
output current and voltage when an excessively large RL is
used. The output compliance voltage is 200mV below the
supply voltage as listed in VO-MAX of the “Electrical
Specifications” table on page 2.
Optical Sensor Location Outline
The green area in Figure 18 shows the optical sensor
location outline of ISL29009. Along the pin-out direction, the
center line (CL) of the sensor coincides with that of the
packaging. The sensor width in this direction is 0.39mm.
Perpendicular to the pin-out direction, the CL of the sensor
has an 0.19mm offset from the CL of packaging away from
pin-1. The sensor width in this direction is 0.46mm.
2.10mm
2.00mm
0.19mm
29009
0.46mm
0.39mm
FIGURE 18. 6 LD ODFN SENSOR LOCATION OUTLINE
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6
FN6484.0
July 1, 2008
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