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ISL29001IROZ-T7 데이터시트(PDF) 8 Page - Intersil Corporation

부품명 ISL29001IROZ-T7
상세설명  Light-to-Digital Sensor
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
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8
FN6166.5
February 8, 2007
The internal oscillator, fosc, operates identically in both the
internal and external timing modes, with the same
dependence on REXT. However, when using one of the three
external timing modes, the number of clock cycles per
integration is no longer fixed at 32,768, but varies with the
chosen integration time, and is limited to 65,536. In order to
avoid erroneous lux readings the integration must be short
enough not to allow an overflow in the counter register.
where:
tint = user defined integration time
fosc = 327.6kHz*100kΩ/REXT. ISL29001’s internal
oscillator. Not to be confused with the I2C’s frequency.
REXT = user defined external resistor to adjust fosc. 100kΩ
recommended.
The number of clock cycles in the previous integration period
is provided in the third and fourth bytes of data read across
the I2C bus. This two-byte value is called the integration
counter value.
When using one of the three external timing modes, the
ISL29001’s resolution varies with the integration time. The
resolution is determined by the ratio of the max lux range to
the number of clock cycles per integration.
The following equations describe the light intensity as a
function of sensor reading, integration counter value, and
integration time:
where E is the measured light intensity, Data1 is the sensor
reading, Data2 is the integration counter value, t is the
integration time, and REXT is external resistor value.
Noise Rejection and Integration Time
In general, integrating type ADC’s have an excellent noise-
rejection characteristics for periodic noise sources whose
frequency is an integer multiple of the integration time. For
instance, a 60Hz AC unwanted signal’s sum from 0ms to
n*16.66ms (n = 1,2...ni) is zero. Similarly, setting the
ISL29001’s integration time to an integer multiple of periodic
noise signal greatly improves the light sensor output signal
in the presence of noise. The integration time, tint, of the
ISL29002 is set by an external resistor REXT. See
Equation 3.
Design Example 1
Using the ISL29001, determine a suitable integration time,
tint, that will ignore the presence of both 60Hz and 50Hz
noise. Accordingly, specify the REXT value. Given that the
I2C clock is at fI2C = 10kHz.
Solution 1 - Using Internal Timing
tint = n(1/60Hz) = m(1/50Hz). In order to achieve both 60Hz
and 50Hz AC rejection, the integration time needs to be
adjusted to coincide with an integer multiple of the AC noise
cycle times.
n/m = 60Hz/50Hz = 6/5. The first instance of integer values
at which tint rejects both 60Hz and 50Hz is when m = 5, and
n = 6.
tint = 6(1/60Hz) = 5(1/50Hz) = 100ms
From Equation 3:
REXT = tint * (100kΩ/100ms) = 100kΩ. By populating
REXT = 100k
Ω, the ISL29001 defaults to 100ms integration
time and will reject the presence of both 60Hz and 50Hz
power line signals.
Solution 2 - Using External Timing
From solution 1, the desired integration time is 100ms. Note
that the REXT resistor does not determine the integration
time when using external timing mode. Instead, the
integration and the 16-bit counter starts when an external
timing mode command is sent and end when another
external timing mode is sent. In other words, the time
between two external timing mode command is the
integration time. The programmer determines how many
clock cycles to wait between two external timing commands.
iI2C = fI2C * tint, where iI2C = number of I
2C cycles
iI2C = 10kHz *100ms
iI2C = 1,000 I
2C clock cycles. An external timing command
1,000 cycles after another external timing command rejects
both 60Hz and 50Hz AC noise signals.
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 9 shows the
effective spectral response after applying Equation 8 of the
ISL29001 from 400nm to 1000nm. The equation below
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
t
int
65,536
f
OSC
------------------
<
(EQ. 6)
E Lux
()
10 000lux
,
R
ext 100 kΩ
()
---------------------------------------
Data1
Data2
-----------------
=
(EQ. 7)
D
3
nD
1
kD
2
()
=
(EQ. 8)
ISL29001


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