ISL29101_14 Datasheet, PDF (6/7 Pages) Intersil Corporation – Small, Low Power, Voltage-Output Ambient Light Photo Detect IC

ISL29101
Application Information
Light-to-Voltage Conversion
The ISL29101 has responsiveness that is a linear 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).
V_OUT = (1.6μA ⁄ 100lux ) • E • R_EXT
(EQ. 1)
Here, V_OUT is the output voltage and E is the light intensity.
R_EXT is the value of the external resistor, which is used to
set the light-to-voltage scaling constant. The compliance of
the ISL29101’s output circuit may result in premature
saturation when an excessively large R_EXT is used. The
output compliance voltage is 700mV 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 17 shows the optical sensor
location outline of ISL29101. Along the pinout 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
29101
0.39mm
FIGURE 17. 6 LD ODFN SENSOR LOCATION OUTLINE
0.46mm
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FN6510.1
November 5, 2012