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| 型号： | ISL29003 |
| 厂商： | Intersil Corporation |
| 英文描述： | Light-to-Digital Output Sensor with High Sensitivity, Gain Selection, Interrupt Function and I2C Interface(具有高灵敏度，增益可选，中断功能和I2C接口的光电输出传感器) |
| 中文描述： | 光到数字输出传感器灵敏度高，增益选择，中断功能和I2C接口（具有高灵敏度，增益可选，中断功能和的I2C接口的光电输出传感器） |
| 文件页数： | 10/15页 |
| 文件大小： | 258K |
| 代理商： | ISL29003 |
10
FN7464.3
October 8, 2007
Solution 2 -
Using External Timing Mode
From solution 1, the desired integration time is 100ms. Note
that the R
EXT
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 I
2
C. The programmer determines how
many I
2
C clock cycles to wait between two external timing
commands.
i
I2C
= f
I2C*
t
int
= number of I
2
C clock cycles
i
I2C
= 10kHz
*
100ms
i
I2C
= 1,000 I
2
C 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 R
EXT
= 100k
Ω
and to choose the
Gain/Range Mode. For a maximum 500 lux, Range1 is
adequate. From Equation 3:
1000 lux100k
Ω
Ω
FSR
1000 lux
=
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.
IR 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 8 shows the
effective spectral response after applying Equation 14 of the
ISL29003 from 400nm to 1000nm. Equation 14 describes the
method of cancelling IR in internal timing mode.
Where:
data = lux amount in number of counts less IR presence
D1 = data reading of Diode 1
D2 = data reading of Diode 2
n = 1.85. This is a fudge factor to scale back the sensitivity
up to ensure Equation 4 is valid.
k = 7.5. 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
ISL29003. 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 ISL29003.
Table 16 shows the recommended dimensions of the optical
window to ensure both 35° and 45° viewing angle. These
dimensions are based on a window lens thickness of 1.0mm
and a refractive index of 1.59.
TABLE 14. SOLUTION1 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
t
int
100ms
R
EXT
50k
Ω
Gain/Range Mode
Range1 = 1000 lux
FSR
2000 lux
2
16
# of clock cycles
Transfer Function
TABLE 15. SOLUTION2 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
t
int
100ms
R
EXT
100k
Ω
Gain/Range Mode
Range1 = 1000 lux
FSR
1000 lux
# of clock cycles
COUNTER = 1000
Transfer Function
E
2
----------------
2000 lux
×
=
FSR
=
E
-------------------------------
1000 lux
×
=
E
-------------------------------
1000 lux
×
=
D3
n D1
kD2
–
)
=
(EQ. 14)
D
LENS
t
D1
D
TOTAL
= Viewing angle
WINDOW LENS
ISL29003
FIGURE 4. FLAT WINDOW LENS
ISL29003
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