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ISL29023 数据表(PDF) 7 Page - Intersil Corporation

部件名 ISL29023
功能描述  Integrated Digital Ambient Light Sensor with Interrupt Function
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL29023 数据表(HTML) 7 Page - Intersil Corporation

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7
FN6691.0
March 3, 2009
Integration and Conversion Time
The ADC resolution and fOSC determine the integration
time, tint.
where n is the number of bits of resolution and n = 4, 8, 12 or
16. Therefore, 2n is the number of clock cycles. n can be
programmed at the command register 01(hex) bits 3 and 2.
External Scaling Resistor REXT for fOSC and Range
The ISL29023 uses an external resistor REXT to fix its
internal oscillator frequency fOSC and the light sensing
range, Range. fOSC and Range are inversely proportional to
REXT. For user simplicity, the proportionality constant is
referenced to 499k
Ω:
Noise Rejection
In general, integrating type ADC’s have excellent
noise-rejection characteristics for periodic noise sources
whose frequency is an integer multiple of the conversion
rate. For instance, a 60Hz AC unwanted signal’s sum from
0ms to k*16.66ms (k = 1,2...ki) 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 ISL29023’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing.
Here, EIR is the received IR intensity. The constant β
changes with the spectrum of background IR noise, such as
sunlight and incandescent light. The
β also changes with the
ADC’s range and resolution selections.
Suggested PCB Footprint
It is important that the users check the “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 ISL29023 is relatively insensitive to layout. Like other
I2C 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 I2C 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.
Typical Circuit
A typical application for the ISL29023 is shown in Figure 3.
The ISL29023’s I2C address is internally hardwired as
1000100. The device can be tied onto a system’s I2C bus
together with other I2C compliant devices.
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, and is qualified to +260°C. A standard reflow
soldering profile with a +260°C maximum is recommended.
TABLE 8. INTEGRATION TIME OF n-BIT ADC
REXT
(k
Ω)
n = 16-BIT
n = 12-BIT
n = 8-BIT
n = 4-BIT
250
45ms
2.8ms
176µs
11µs
499**
90ms
5.6ms
352µs
22µs
**Recommended REXT resistor value
tint
2
n
1
fOSC
--------------
×
2
n
REXT
725kHz 499k
Ω
×
----------------------------------------------
×
==
(EQ. 4)
(EQ. 5)
Range
499k
Ω
REXT
------------------
Range k
()
×
=
(EQ. 6)
fOSC
499k
Ω
REXT
------------------
725
×
kHz
=
DATAIR
β E
IR
×
=
(EQ. 7)
ISL29023


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