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ISL29010
Number of Clock Cycles, n-bit ADC
The number of clock cycles determines “n” in the n-bit ADC; 2 n
clock cycles is a n-bit ADC. n is programmable in the command
register in the width function. Depending on the application, a
good balance of speed and resolution has to be considered
when deciding for n. For fast and quick measurement, choose
the smallest n = 3. For maximum resolution without regard of
time, choose n = 15. Table 10 compares the trade-off between
integration time and resolution. See Equations 10 and 11 for the
relation between integration time and n. See Equation 3 for the
relation of n and resolution.
TABLE 10. RESOLUTION AND INTEGRATION TIME
SELECTION
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 lux 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 ISL29010 offers user flexibility in the integration time to
balance resolution, speed and noise rejection. Integration time
can be set internally or externally and can be programmed in
the command register 00(hex) Bit 5.
RANGE1
RANGE4
f OSC = 327kHz
f OSC = 655kHz
INTEGRATION TIME IN INTERNAL TIMING MODE
t INT
RESOLUTION
t INT
RESOLUTION
This timing mode is programmed in the command register
(EQ. 9)
× ----------
t INT = 2
n
15
11
7
3
(ms)
200
12.8
0.8
0.05
LUX/COUNT
0.06
1.0
15.6
250
(ms)
100
6.4
0.4
0.025
(LUX/COUNT)
2
62.5
1,000
16,000
00(hex) Bit 5. Most applications will be using this timing
mode. When using the Internal Timing Mode, f OSC and
n-bits resolution determine the integration time. t INT is a
function of the number of clock cycles and f OSC .
m 1
for Internal Timing Mode only
f osc
R EXT = 100k Ω
m = 4, 8, 12, and16. n is the number of bits of resolution.
External Scaling Resistor R EXT and f osc
The ISL29010 uses an external resistor R EXT to fix its
internal oscillator frequency, f OSC . Consequently, R EXT
determines the f OSC , integration time and the FSR of the
device. f OSC , a dual speed mode oscillator, is inversely
2 m therefore is the number of clock cycles. n can be
programmed at the command register 00(hex) Bits 1 and 0.
Since f OSC is dual speed depending on the Gain/Range bit,
t INT is dual time. The integration time as a function of R EXT
m R EXT
t INT 1 = 2
327kHz × 100k Ω
proportional to R EXT . For user simplicity, the proportionality
constant is referenced to fixed constants 100k Ω and
655kHz:
is shown in Equation 10:
× ----------------------------------------------
(EQ. 10)
f OSC 1 = --- × ------------------ × 655 kHz
R EXT
2
1 100k Ω
(EQ. 6)
t INT 1 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range1
f OSC 2 = ------------------ × 655 kHz
m R EXT (EQ. 11)
t INT 2 = 2
655kHz × 100k Ω
100k Ω (EQ. 7)
R EXT
f OSC 1 is oscillator frequency when Range1 or Range2 are
set. This is nominally 327kHz when R EXT is 100k Ω .
f OSC 2 is the oscillator frequency when Range3 or Range4
are set. This is nominally 655kHz when R EXT is 100k Ω .
When the Range/Gain bits are set to Range1 or Range2,
or Range2.
× ----------------------------------------------
t INT 2 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range3
or Range4.
TABLE 11. INTEGRATION TIMES FOR TYPICAL R EXT VALUES
f OSC runs at half speed compared to when Range/Gain bits
RANGE1
RANGE3
f OSC 1 = --- ( f OSC 2 )
are set to Range3 and Range4.
1
2
(EQ. 8)
R EXT
(k Ω)
RANGE2
n = 15-BIT n = 11-BIT
RANGE4
n = 11-BIT n=3
50
100
6.4
3.2
0.013
The automatic f OSC adjustment feature allows significant
improvement of signal-to-noise ratio when detecting very low
lux signals.
100**
200
500
200
400
1000
13
26
64
6.5
13
32
0.025
0.050
0.125
*Integration time in milliseconds
**Recommended R EXT resistor value
7
FN6414.1
November 11, 2011
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