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ISL29000
Pin Descriptions
For some applications, a load resistor is added between the
output and the ground as shown in Figure 1. The output
V OUT = I OUT × R LOAD = ? ------------------------ ? × L INPUT × R LOAD
PIN
1
2
NAME
VCC
GND
DESCRIPTION
Supply, 2.5V to 5.5V
Ground
voltage can be expressed in Equation 2:
61 μ A
? 1000Lux ?
(EQ. 2)
3
EN
Enable
4
5
NC
Output
No connect
Current output pin
Here, V OUT is the output voltage and R LOAD is the value of
the load resistor added. The compliance of the ISL29000's
output circuit may result in premature saturation of the
Block Diagram
VCC
1
output current and voltage when an excessively large
R LOAD is used. The output compliance voltage is 300mV
below the supply voltage as listed in V O(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
ENABLE
3
value (i.e., gain) should be picked for a specific input light
range. The resistor value can be picked according to
Equation page 4:
R LOAD = --------------------------------------- × ------------------------
L RANGE
61 μ A
5
( V SUP – 0.3V ) 1000Lux
·
(EQ. 3)
OUTPUT
Here, V SUP is the supply voltage, and L RANGE is the
specific input light range for an application. For example, an
indoor light ranges typically from 0 lux to 1,000 lux. A resistor
value of 45k Ω for 3V supply voltage can be used. For a small
2
GND
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 100 lux 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:
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 R LOAD Selection
The resistor output, R LOAD , determines the voltage transfer
function of the device. The device converts light into current
then R LOAD converts the output current to an output voltage.
R LOAD can range from 10 Ω to 10M Ω depending on the input
lux levels. The table below lists R LOAD 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 R LOAD . For faster response, choose a
smaller value R LOAD to shunt stray capacitances that may
slow down response time. For maximum dynamic range or
swing, choose a higher value R LOAD . 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
R LOAD is 10M Ω .
Although the device saturates at 10,000 lux (I OUT = 600μA),
the output current must never exceed 6mA. The voltage
I OUT = ? ------------------------ ? × L INPUT
61 μ A
? 1000Lux ?
(EQ. 1)
output compliance of the device is 300mV below the supply.
The output current stops ramping when the output voltage
Here, I OUT is the output current in μA, and L INPUT is the
input light in lux.
4
reaches voltage compliance.
FN6117.6
September 2, 2008
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