ISL29009_14 Datasheet, PDF (6/7 Pages) Intersil Corporation – Non-Linear Output Current, Low Power Ambient Light Photo Detect IC

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).
I_OUT
=
----¹---^.--⁸----^μ----^A-----
100 l u x
E
(EQ. 1)
Here, I_OUT is the output current in µA, and E is the input light
in lux.
A load resistor R_L is added to convert I_OUT into V_OUT. The
output voltage can be expressed in Equation 2:
V_OUT
=
I_OUT × R_L
=
----¹---^.--⁸----^μ----^A-----
100 l u x
E × R_L
(EQ. 2)
Here, V_OUT is the output voltage and R_L 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 R_L is
used. The output compliance voltage is 200mV below the
supply voltage as listed in V_O-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
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
6
FN6484.0
July 1, 2008