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ISL29000IROZ-T7 Datasheet(PDF) 4 Page - Intersil Corporation

No. de pieza ISL29000IROZ-T7
Descripción Electrónicos  Ambient Light Photo Detect IC
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29000IROZ-T7 Datasheet(HTML) 4 Page - Intersil Corporation

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4
FN6117.4
February 9, 2007
Block Diagram
Application Information
Product Description
The ISL29000 is a light-to-current optical sensor combining
photodiodes and current amplifiers on a single monolithic IC.
The photodiodes are temperature-compensated and their
spectrum resembles the human eye response. The output
current is directly proportional to the intensity of light falling
on the photodiodes. For 100lux of input fluorescent light, the
ISL29000 has an output current of 6.5µA.
The ISL29000 is housed in an ultra-compact surface mount
clear plastic package.
Light-to-Current and Voltage Conversion
The ISL29000 has a responsiveness that is directly
proportional to the intensity of light intercepted by the
photodiodes. Although the conversion rate varies depending
on the light sources (fluorescent light, incandescent light or
direct sunlight), in general for a fluorescent light, the light-to-
current conversion is:
Here, IOUT is the output current in µA, and LINPUT is the
input light in lux.
For some applications, a load resistor is added between the
output and the ground as shown in Figure 1. The output
voltage can be expressed in the following equation:
Here, VOUT is the output voltage and RLOAD is the value of
the load resistor added. The compliance of the ISL29000's
output circuit may result in premature saturation of the
output current and voltage when an excessively large
RLOAD is used. The output compliance voltage is 300mV
below the supply voltage as listed in VO(MAX) of Electrical
Specifications on page 2.
In order to have the linear relationship between the input
light and the output current and voltage, a proper resistor
value (i.e., gain) should be picked for a specific input light
range. The resistor value can be picked according to the
following equation:
Here, VSUP is the supply voltage, and LRANGE is the
specific input light range for an application. For example, an
indoor light ranges typically from 0lux to 1,000lux. A resistor
value of 45k
Ω for 3V supply voltage can be used. For a small
light range, a large resistor value should be used to achieve
better sensitivity; for a large light range, a small resistor
value should be used to prevent non-linear output current
and voltage.
Resistor Output RLOAD Selection
The resistor output, RLOAD, determines the voltage transfer
function of the device. The device converts light into current
then RLOAD converts the output current to an output voltage.
RLOAD can range from 10Ω to 10MΩ depending on the input
lux levels. The table below lists RLOAD values to maximize
output swing for typical lux range levels. A careful balance of
dynamic swing and fast response has to be considered
when choosing RLOAD. For faster response, choose a
smaller value RLOAD to shunt stray capacitances that may
slow down response time. For maximum dynamic range or
swing, choose a higher value RLOAD. Although finite, the
output impedance of the device is considerably large.
Hence, the light-to-current conversion deviation because of
resistor loading is infinitesimal. The recommended maximum
RLOAD is 10MΩ.
Although the device saturates at 10,000lux (IOUT = 600µA),
the output current must never exceed 6mA. The voltage
output compliance of the device is 300mV below the supply.
The output current stops ramping when the output voltage
reaches voltage compliance.
Pin Descriptions
PIN
NAME
DESCRIPTION
1
VCC
Supply, 2.5V to 5.5V
2
GND
Ground
3EN
Enable
4
NC
No connect
5
Output
Current output pin
ENABLE
OUTPUT
GND
VCC
1
2
5
3
I
OUT
61
μA
1000Lux
------------------------
⎝⎠
⎛⎞
L
INPUT
×
=
(EQ. 1)
V
OUT
I
OUT
R
LOAD
×
61
μA
1000Lux
------------------------
⎝⎠
⎛⎞
L
INPUT
R
LOAD
×
×
==
(EQ. 2)
R
LOAD
V
SUP
0.3V
()
61
· μA
---------------------------------------
1000Lux
L
RANGE
------------------------
×
=
(EQ. 3)
ISL29000


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