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FN6484.0

July 1, 2008

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).

in lux.

output voltage can be expressed in Equation 2:

load resistor added. The compliance of the ISL29009's

output circuit may result in premature saturation of the

used. The output compliance voltage is 200mV below the

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.

I

OUT

1.8

μA

100lux

----------------------- E

=

(EQ. 1)

V

OUT

I

OUT

R

L

×

1.8

μA

100lux

----------------------- ER

L

×

==

(EQ. 2)

FIGURE 18. 6 LD ODFN SENSOR LOCATION OUTLINE

2.10mm

2.00mm

0.39mm

0.46mm

0.19mm

29009

ISL29009