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ISL29020 데이터시트(PDF) 6 Page - Intersil Corporation

부품명 ISL29020
상세설명  A Low Power, High Sensitivity, Light-to Digital Sensor With I2C Interface
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29020 데이터시트(HTML) 6 Page - Intersil Corporation

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6
FN6505.0
September 26, 2008
.
5. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted via I2C using Bits 1 and 0. Table 8 lists the
possible values of FSR for the 500k
Ω R
EXT resistor.
Data Registers (01 hex and 02 hex)
The device has two 8-bit read-only registers to hold a 16-bit
data from ADC or Timer. The most significant byte is
accessed at 02 hex, and the least significant byte is
accessed at 01 hex. The registers are refreshed after every
conversion cycle.
Calculating Lux
The ISL29020’s ADC output codes, DATA, are directly
proportional to lux in the ambient light sensing, as shown in
Equation 1.
Here, Ecal is the calculated lux reading. The constant α is
determined by the Full Scale Range and the ADC’s
maximum output counts. The constant can also be viewed
as the sensitivity: the smallest lux measurement the device
can measure, as shown in Equation 2.
Here, Range(k) is defined in Table 8. Countmax is the
maximum output counts from the ADC.
The transfer function used for each timing mode becomes:
INTERNAL TIMING MODE
Here, n = 4, 8, 12 or 16. This is the number of ADC bits
programmed in the command register. 2n represents the
maximum number of counts possible from the ADC output in
Internal-Timing mode. Data is the ADC output stored in the
data registers (01 hex and 02 hex).
EXTERNAL TIMING MODE
Here, Timer sets up the ADC’s maximum count reading and
it is the number of clock cycles accrued in the integration
time (set by sync_I2C pulses) in External-Timing mode. It is
stored in the data registers 01h and 02h when the command
is coded as 1xx101xx. Data is the ADC output. In this mode,
the command has to be sent out again with code 1xx100xx
to request the ADC output data from registers 01h and 02h.
External Scaling Resistor REXT for fOSC and
Range
The ISL29020 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 500k
Ω:
Integration Time or Conversion Time
Integration time is the period during which the device’s
analog-to-digital ADC converter samples the photodiode
current signal for a measurement. Integration time, in other
words, is the time to complete the conversion of analog
photodiode current into a digital signal (number of counts).
Integration time affects the measurement resolution. For
better resolution, use a longer integration time. For short and
fast conversions, use a shorter integration time.
The ISL29020 offers user flexibility in the integration time to
balance resolution, speed and noise rejection. Integration time
can be set internally or externally by programming the bit 4 of
the command register 00(hex).
INTEGRATION TIME IN INTERNAL-TIMING MODE
Most applications will use the Internal-Timing mode. In this
mode, fOSC and ADC n-bits resolution determine the
integration time, tint, as shown in Equation 7.
where n is the number of bits of resolution and n = 4, 8, 12 or
16. 2n, therefore, is the number of clock cycles. n can be
programmed at the command register 00(hex) bits 3 and 2.
TABLE 7. RESOLUTION/WIDTH
BITS 3:2
NUMBER OF CLOCK CYCLES
0:0
216 = 65,536
0:1
212 = 4,096
1:0
28 = 256
1:1
24 = 16
TABLE 8. RANGE/FSR LUX
BITS
1:0
k
RANGE(k)
FSR (LUX) @
ALS SENSING
FSR (LUX) @ IR
SENSING
0:0
1
Range1
1,000
Refer to page 2
0:1
2
Range2
4,000
Refer to page 2
1:0
3
Range3
16,000
Refer to page 2
1:1
4
Range4
64,000
Refer to page 2
TABLE 9. DATA REGISTERS
ADDRESS
(hex)
CONTENTS
01
Least-significant byte of most recent ADC or Timer data.
02
Most-significant byte of most recent ADC or Timer data.
E
cal
α DATA
×
=
(EQ. 1)
α
Range k
()
Count
max
----------------------------
=
(EQ. 2)
(EQ. 3)
E
Range k
()
2
n
---------------------------
DATA
×
=
(EQ. 4)
E
Range k
()
Timer
---------------------------
DATA
×
=
(EQ. 5)
Range
500k
Ω
R
EXT
------------------
Range k
()
×
=
(EQ. 6)
f
OSC
500k
Ω
R
EXT
------------------
725
×
kHz
=
t
int
2
n
1
f
OSC
--------------
×
2
n
R
EXT
725kHz
500k
Ω
×
----------------------------------------------
×
==
(EQ. 7)
ISL29020


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