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参数资料
| 型号： | ISL29033IROZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC PHOTO DETECTOR AMBIENT 6-ODFN |
| 标准包装： | 3,000 |
| 带接近传感器： | 无 |
| 波长： | 540nm |
| 电源电压： | 2.25 V ~ 3.63 V |
| 输出类型： | 电流 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL29033
TABLE 8. INTEGRATION TIME OF n-BIT ADC
Typical Circuit
R EXT
(k ? )
499
n = 16-BIT
(ms)
100
n = 12-BIT
(ms)
6.25
n = 8-BIT
(μs)
391
n = 4-BIT
(μs)
24
A typical application for the ISL29033 is shown in Figure 5. The
ISL29033 I 2 C address is internally hardwired as 1000100. The
device can be tied onto a system’s I 2 C bus together with other
I 2 C compliant devices.
Range = ------------------- × Range ( k )
1000 200 12.5 782 48
External Scaling Resistor R EXT for f OSC and
Range
The ISL29033 uses an external resistor, R EXT , to fix its internal
oscillator frequency, f OSC , and the light sensing range, Range.
The f OSC and Range are inversely proportional to R EXT . For ease
of use, the proportionality constant is referenced to 499k ? .
Calculation for Range is shown in Equation 5 and for f OSC in
Equation 6.
499k Ω (EQ. 5)
R EXT
Soldering Considerations
Convection heating is recommended for reflow soldering;
direct-infrared heating is not recommended. The plastic ODFN
package does not require a custom reflow soldering profile; it is
qualified to +260°C. A standard reflow soldering profile with a
+260°C maximum is recommended.
ALS Sensor Window Layout
Special care should be taken to ensure that the sensor, as shown
in the sensor location outline (Figure 6), is uniformly illuminated.
Shadows from off-angle window openings can affect uniform
illumination, which in turn can affect measurement results.
f OSC = ------------------- × 655 kHz
499k Ω
R EXT
(EQ. 6)
Noise Rejection
In general, integrating-type ADCs have excellent noise rejection
characteristics for periodic noise sources for which frequency is
an integer multiple of the conversion rate. For example, a 60Hz
AC unwanted signal’s sum from 0ms to k*16.66ms (k = 1,2...k i )
is zero. Similarly, setting the device’s integration time to be an
integer multiple of the periodic noise signal greatly improves the
light sensor output signal in the presence of noise.
ADC Output in IR Sensing
The ISL29033 ADC output codes, DATA, are directly proportional
to the IR intensity received in IR sensing, as shown in Equation 7.
DATA IR = β × E IR
(EQ. 7)
In this equation, E IR is the received IR intensity. The constant, b,
changes with the spectrum of background IR noise, such as
sunlight and incandescent light. The constant, b, also changes
with ADC range and resolution selections.
Suggested PCB Footprint
It is important that users check Tech Brief 477, “Surface Mount
Assembly Guidelines for Optical Dual FlatPack No Lead (ODFN)
Package” before starting ODFN product board mounting:
http://www.intersil.com/data/tb/TB477.pdf
Layout Considerations
The ISL29033 is relatively insensitive to layout. Like other I 2 C
devices, it is intended to provide excellent performance even in
significantly noisy environments. Attention to a few
considerations will ensure best performance.
Route the supply and I 2 C traces as far as possible from all
sources of noise. Use two power-supply decoupling capacitors,
1μF and 0.1μF, placed close to the device.
10
FN7656.2
February 25, 2013
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