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ISL29004IROZ-EVALZ Datasheet(PDF) 11 Page - Intersil Corporation

No. de pieza ISL29004IROZ-EVALZ
Descripción Electrónicos  Light-to-Digital Output Sensor with Address Selection, High Sensitivity, Gain Selection, Interrupt Function and I2C Interface
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29004IROZ-EVALZ Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN6221.0
December 21, 2006
The Full Scale Range, FSR, needs to be determined. From
Equation 3:
The effective transfer function becomes:
Solution 2 - Using External Timing Mode
From solution 1, the desired integration time is 100ms. Note
that the REXT resistor only determines the inter oscillator
frequency when using external timing mode. Instead the
integration time is the time between two sync_iic commands
sent through the I2C. The programmer determines how
many I2C clock cycles to wait between two external timing
commands.
iI2C = fI2C * Tint = number of I
2C clock cycles
iI2C = 10kHz *100ms
iI2C = 1,000 I
2C clock cycles. An external sync_iic command
sent 1,000 cycles after another sync_iic command rejects
both 60Hz and 50Hz AC noise signals.
Next is to pick an arbitrary REXT = 100kΩ and to choose the
Gain/Range Mode. For a maximum 500Lux, Range1 is
adequate. From Equation 3:
The effective transfer function becomes:
DATA is the sensor reading data located in data registers
04(hex) and 05(hex)
COUNTER is the timer counter value data located in data
registers 06(hex) and 07(hex). In this sample problem,
COUNTER = 1000.
Light Source Detection and Infra-Red Rejection
Any filament type light source has a high presence of infrared
component invisible to the human eye. A white fluorescent
lamp, on the other hand has a low IR content. As a result,
output sensitivity may vary depending on the light source.
Maximum attenuation of IR can be achieved by properly
scaling the readings of Diode1 and Diode2. The user obtains
data reading from sensor diode 1, D1, which is sensitive to
visible and IR, then reading from sensor diode 2, D2 which is
mostly sensitive from IR. The graph on Figure 7 shows the
effective spectral response after applying Equation 15 of the
ISL29003 from 400nm to 1000nm. The equation below
describes the method of cancelling IR in internal timing mode.
Where:
D3 = Lux amount in number of counts less IR presence
D1 = data reading of Diode 1
D2 = data reading of Diode 2
n = 1.355. This is a fudge factor to scale back the sensitivity
up to ensure Equation 4 is valid.
k = 3.355. This is a scaling factor for the IR sensitive
Diode 2.
Flat Window Lens Design
A window lens will surely limit the viewing angle of the
ISL29004. The window lens should be placed directly on top
of the device. The thickness of the lens should be kept at
minimum to minimize loss of power due to reflection and
also to minimize loss of loss due to absorption of energy in
the plastic material. A thickness of t = 1mm is recommended
for a window lens design. The bigger the diameter of the
window lens the wider the viewing angle is of the ISL29001.
Table 16 shows the recommended dimensions of the optical
window to ensure both +35° and +45° viewing angle. These
TABLE 14. SOLUTION1 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
Tint
100ms
REXT
50k
Ω
Gain/Range Mode
Range1 = 1000Lux
FSR
2000Lux
# of clock cycles
216
Transfer Function
FSR
1000Lux
100k
Ω
50k
Ω
------------------
=
FSR
2000Lux
=
E
data
2
16
-------------
2000Lux
×
=
E
DATA
2
16
-----------------
2000Lux
×
=
FSR
1000lux
100k
Ω
100k
Ω
------------------
=
FSR
1000Lux
=
E
DATA
COUNTER
--------------------------------
1000Lux
×
=
TABLE 15. SOLUTION2 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
Tint
100ms
REXT
100k
Ω
Gain/Range Mode
Range1 = 1000Lux
FSR
1000Lux
# of clock cycles
COUNTER = 1000
Transfer Function
E
DATA
COUNTER
--------------------------------
1000Lux
×
=
D3
n D1
kD2
()
=
(EQ. 15)
ISL29004


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