参数资料
型号: ISL29023IROZ-EVALZ
厂商: Intersil
文件页数: 11/14页
文件大小: 0K
描述: EVALUATION BOARD ISL29023IROZ
标准包装: 1
传感器类型: 灯光,数字式输出
传感范围: 64000Lux
接口: I²C,SM 总线
灵敏度: 540nm
电源电压: 2.25 V ~ 3.63 V
嵌入式:
已供物品:
已用 IC / 零件: ISL29023
ISL29023
Board Mounting Considerations
For applications requiring the light measurement, the board
mounting location should be reviewed. The device uses an
Optical Dual Flat Pack No Lead (ODFN) package, which subjects
the die to mild stresses when the printed circuit (PC) board is
heated and cooled, which slightly changes the shape. Because of
these die stresses, placing the device in areas subject to slight
twisting can cause degradation of reference voltage accuracy. It
is normally best to place the device near the edge of a board, or
on the shortest side, because the axis of bending is most limited
in that location.
Layout Considerations
The ISL29023 is relatively insensitive to layout. Like other I 2 C
devices, it is intended to provide excellent performance even in
significantly noisy environments. There are only a few
considerations that 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. R EXT must be placed
as closely to the pin as possible to eliminate the stray
capacitance, which will greatly affect the performance of the
sensor.
Soldering Considerations
Temperature Coefficient
The limits stated for temperature coefficient (Tempco) are
governed by the method of measurement. The overwhelming
standard for specifying the temperature drift of a reference is to
measure the reference voltage at two temperatures, take the
total variation, (VHIGH - VLOW), and divide by the temperature
extremes of measurement (THIGH - TLOW). The result is divided
by the nominal reference voltage (at T = +25°C) and multiplied
by 106 to yield ppm/°C. This is the "Box" method for specifying
temperature coefficient.
Digital Inputs and Termination
The ISL29023 digital inputs are guaranteed to CMOS levels. The
internal register is updated on the rising edge of the clock. To
minimize reflections, proper termination should be
implemented. If the lines driving the clock and the digital inputs
are 50 ? lines, then 50 ? termination resistors should be placed
as close to the sensor inputs as possible, connected to the digital
ground plane (if separate grounds are used).
Typical Circuit
A typical application for the ISL29023 is shown in Figure 1. The
ISL29023’s I 2 C address is internally hard-wired as 1000100. The
device can be tied onto a system’s I 2 C bus together with other I 2 C
compliant devices.
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, and is
qualified to +260°C. A standard reflow soldering profile with a
+260°C maximum is recommended.
1.7V TO 3.63V
R1
R2
R3
I 2 C MASTER
MICROCONTROLLER
SDA
2.25V TO 3.63V
SCL
INT
I 2 C SLAVE_0
I 2 C SLAVE_1
I 2 C SLAVE_n
1
2
VDD
GND
SDA
SCL
6
5
SDA
SCL
SDA
SCL
C1
C2
10μF
0.1μF
3
REXT
INT
4
R EXT
ISL29023
499k
FIGURE 15. ISL29023 TYPICAL SYSTEM DIAGRAM
11
FN6691.3
April 25, 2013
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