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| 型号： | ISL29004IROZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR LIGHT-DGTL I2C 8-ODFN |
| 产品培训模块： | Ambient Light Sensors |
| 标准包装： | 1 |
| 带接近传感器： | 无 |
| 波长： | 550nm |
| 电源电压： | 2.5 V ~ 3.3 V |
| 输出类型： | I²C? |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | ISL29004IROZ-T7DKR |
ISL29004
The Full Scale Range, FSR, needs to be determined. From
Equation 3:
TABLE 15. SOLUTION2 SUMMARY TO EXAMPLE DESIGN
PROBLEM
100k Ω
50k Ω
E = ------------- × 2000 L ux
E = -------------------------------- × 1000Lux
FSR = 1000Lux ------------------
FSR = 2000 L ux
The effective transfer function becomes:
data
16
2
TABLE 14. SOLUTION1 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
DESIGN PARAMETER
T int
R EXT
Gain/Range Mode
FSR
# of clock cycles
Transfer Function
VALUE
100ms
100k Ω
Range1 = 1000Lux
1000Lux
COUNTER = 1000
DATA
COUNTER
E = ----------------- × 2000Lux
T int
R EXT
Gain/Range Mode
FSR
# of clock cycles
Transfer Function
100ms
50k Ω
Range1 = 1000Lux
2000Lux
2 16
DATA
16
2
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 6 shows the
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
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.
frequency when using external timing mode. Instead the
D3 = n ( D1 – kD2 )
(EQ. 15)
100k Ω
100k Ω
E = -------------------------------- × 1000 L ux
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 500Lux, Range1 is
adequate. From Equation 3:
FSR = 1000lux ------------------
FSR = 1000 L ux
The effective transfer function becomes:
DATA
COUNTER
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.
12
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
dimensions are based on a window lens thickness of 1.0mm
and a refractive index of 1.59.
FN6221.1
November 17, 2011
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