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參數(shù)資料
| 型號(hào)： | ISL29003 |
| 廠商： | Intersil Corporation |
| 英文描述： | Light-to-Digital Output Sensor with High Sensitivity, Gain Selection, Interrupt Function and I2C Interface(具有高靈敏度，增益可選，中斷功能和I2C接口的光電輸出傳感器) |
| 中文描述： | 光到數(shù)字輸出傳感器靈敏度高，增益選擇，中斷功能和I2C接口（具有高靈敏度，增益可選，中斷功能和的I2C接口的光電輸出傳感器） |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 258K |
| 代理商： | ISL29003 |
7
FN7464.3
October 8, 2007
Interrupt persist; Bits 1 and 0. The interrupt pin and the
interrupt flag is triggered/set when the data sensor reading is
out of the interrupt threshold window after m consecutive
number of integration cycles. The interrupt persist bits
determine m.
Interrupt Threshold HI Register 02(hex)
This register sets the HI threshold for the interrupt pin and
the interrupt flag. By default the Interrupt threshold HI is
FF(hex). The 8-bit data written to the register represents the
upper MSB of a 16-bit value. The LSB is always 00(hex).
Interrupt Threshold LO Register 03(hex)
This register sets the LO threshold for the interrupt pin and
the interrupt flag. By default the Interrupt threshold LO is
00(hex). The 8-bit data written to the register represents the
upper MSB of a 16-bit value. The LSB is always 00(hex).
Sensor Data Register 04(hex) and 05(hex)
When the device is configured to output a 16-bit data, the
most significant byte is accessed at 04(hex), and the least
significant byte can be accessed at 05(hex). The sensor data
register is refreshed after very integration cycle.
Timer Data Register 06(hex) and 07(hex)
Note that the timer counter value is only available when
using the External Timing Mode. The 06(hex) and 07(hex)
are the LSB and MSB respectively of a 16-bit timer counter
value corresponding to the most recent sensor reading.
Each clock cycle increments the counter. At the end of each
integration period, the value of this counter is made available
over the I
2
C. This value can be used to eliminate noise
introduced by slight timing errors caused by imprecise
external timing. Microcontrollers, for example, often cannot
provide high-accuracy command-to-command timing, and
the timer counter value can be used to eliminate the
resulting noise.
Calculating Lux
The ISL29003’s output codes, DATA, are directly
proportional to lux.
α
DATA
×
=
The proportionality constant
α
is determined by the Full
Scale Range, FSR, and the n-bit ADC which is user defined
in the command register. The proportionality constant can
also be viewed as the resolution; The smallest lux
measurement the device can measure is
α
.
Full Scale Range, FSR, is determined by the software
programmable Range/Gain, Range(k), in the command
register and an external scaling resistor R
EXT
which is
referenced to 100k
Ω
.
The transfer function effectively for each timing mode
becomes:
INTERNAL TIMING MODE
EXTERNAL TIMING MODE
n = 4, 8, 12, or 16. This is the number of clock cycles
programmed in the command register.
Range(k) is the user defined range in the Gain/Range bit
in the command register.
R
EXT
is an external scaling resistor hardwired to the R
EXT
pin.
DATA is the output sensor reading in number of counts
available at the data register.
2
n
represents the maximum number of counts possible in
Internal Timing Mode. For the External Timing Mode the
maximum number of counts is stored in the data register
named COUNTER.
TABLE 9. RANGE/GAIN TYPICAL FSR LUX RANGES
BITS
3:2
k RANGE (k)
FSR LUX
RANGE@
R
EXT
= 100k
FSR LUX
RANGE@
R
EXT
= 50k
FSR LUX
RANGE@
R
EXT
= 500k
0:0
1
973
973
1946
195
0:1
2
3892
3892
7784
778
1:0
3
15,568
15,568
31,136
3114
1:1
4
62,272
62,272
124,544
12,454
TABLE 10. INTERRUPT PERSIST
BITS 1:0
NUMBER OF INTEGRATION CYCLES
0:0
1
0:1
4
1:0
8
1:1
16
TABLE 11. DATA REGISTERS
ADDRESS
(hex)
CONTENTS
04
Least-significant byte of most recent sensor reading.
05
Most-significant byte of most recent sensor reading.
06
Least-significant byte of timer counter value
corresponding to most recent sensor reading.
07
Most-significant byte of timer counter value
corresponding to most recent sensor reading.
E
(EQ. 1)
α
2
------------
=
(EQ. 2)
(EQ. 3)
FSR
Range k
Ω
EXT
-----------------
×
=
(EQ. 4)
E
Range k
----------------------------------------------------
Ω
-----------------
×
2
DATA
×
=
(EQ. 5)
E
Range k
----------------------------------------------------
Ω
-----------------
×
COUNTER
DATA
×
=
ISL29003
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