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ISL29004
TABLE 9. RANGE/GAIN TYPICAL FSR LUX RANGES
TABLE 11. DATA REGISTERS
FSR LUX
FSR LUX
FSR LUX
ADDRESS
BITS
RANGE@
RANGE@
RANGE@
(hex)
CONTENTS
3:2 k RANGE(k) R EXT = 100k R EXT = 50k R EXT = 500k
04
Least-significant byte of most recent sensor reading.
0:0
0:1
1:0
1:1
1
2
3
4
973
3892
15,568
62,272
973
3892
15,568
62,272
1946
7784
31,136
124,544
195
778
3114
12,454
05
06
07
Most-significant byte of most recent sensor reading.
Least-significant byte of timer counter value
corresponding to most recent sensor reading.
Most-significant byte of timer counter value
corresponding to most recent sensor reading.
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
Calculating Lux
The ISL29004’s output codes, DATA, are directly
proportional to Lux.
determine m.
E = α × DATA
(EQ. 1)
TABLE 10. INTERRUPT PERSIST
The proportionality constant α is determined by the Full
BITS 1:0
0:0
0:1
NUMBER OF INTEGRATION CYCLES
1
4
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 .
α = ------------
1:0
1:1
8
16
FSR
n
2
(EQ. 2)
Full Scale Range, FSR, is determined by the software
Interrupt Threshold HI Register 02(hex)
This register sets the the HI threshold for the interrupt pin
and the interrupt flag. By default the Interrupt threshold HI is
programmable Range/Gain, Range(k), in the command
register and an external scaling resistor R EXT which is
referenced to 100k Ω .
FSR = Range ( k ) × ------------------
Range ( k ) × ------------------
R EXT
Range ( k ) × ------------------
R EXT
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 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.
100k Ω
R EXT
The transfer function effectively for each timing mode
becomes:
INTERNAL TIMING MODE
100k Ω
E = ---------------------------------------------------- × DATA
n
2
EXTERNAL TIMING MODE
100k Ω
E = ---------------------------------------------------- × DATA
COUNTER
(EQ. 3)
(EQ. 4)
(EQ. 5)
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.
9
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
FN6221.1
November 17, 2011
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