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ISL29013
(EQ. 9)
× ----------
t INT = 2
t INT = ---------------
m R EXT
× ----------------------------------------------
t INT 1 = 2
INTEGRATION TIME IN INTERNAL TIMING MODE
This timing mode is programmed in the command register
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 as shown in
Equation 9:
m 1
for Internal Timing Mode only
f osc
m = 4, 8, 12, and16. n is the number of bits of resolution.
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
is shown in Equation 10:
(EQ. 10)
327kHz × 100k Ω
count DATA, and starts over again to commence conversion
of diode array 1.
The integration time, t INT , is the sum of two identical time
intervals between the three sync pulses. t INT is determined
by Equation 12:
k OSC
(EQ. 12)
f OSC
where K OSC is the number of internal clock cycles obtained
from Timer data register and f OSC is the internal I 2 C
operating frequency
The internal oscillator, f OSC , operates identically in both the
internal and external timing modes, with the same
dependence on R EXT . However, in External Timing Mode,
the number of clock cycles per integration is no longer fixed
at 2 n . The number of clock cycles varies with the chosen
integration time, and is limited to 2 16 = 65,536. In order to
avoid erroneous lux readings the integration time must be
short enough not to allow an overflow in the counter register.
t INT < ------------------
t INT1 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range1
or Range2.
65,535
f OSC
(EQ. 13)
R EXT
655kHz × 100k Ω
t INT 2 = 2
m
× ----------------------------------------------
(EQ. 11)
f OSC = 327kHz*100k Ω /R EXT . When Range/Gain is set to
Range1 or Range2.
t INT2 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range3
or Range4.
TABLE 13. INTEGRATION TIMES FOR TYPICAL REXT VALUES
f osc = 655kHz*100k Ω /R EXT . When Range/Gain is set to
Range3 or Range4.
Noise Rejection
In general, integrating type ADC’s have excellent
R EXT
(k Ω)
RANGE1
RANGE2
n = 15-BIT n = 11-BIT
RANGE3
RANGE4
n = 11-BIT n=3
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 k*16.66ms (k = 1,2...k i ) is zero. Similarly, setting the
50
100**
200
500
100
200
400
1000
6.4
13
26
64
3.2
6.5
13
32
0.013
0.025
0.050
0.125
device’s integration time to be an integer multiple of the
periodic noise signal, greatly improves the light sensor
output signal in the presence of noise.
Maximum Ambient Intensity Condition
*Integration time in milliseconds
**Recommended R EXT resistor value
INTEGRATION TIME IN EXTERNAL TIMING MODE
This timing mode is programmed in the command register
00(hex) Bit 5. External Timing Mode is recommended when
integration time can be synchronized to an external signal
such as a PWM to eliminate noise.
To read the light count DATA output, the device needs three
sync_I 2 C commands to complete one measurement. The 1st
sync_I 2 C command starts the conversion of the diode array 1.
The 2nd sync_I 2 C completes the conversion of diode array 1
and starts the conversion of diode array 2. The 3rd sync_I 2 C
pules ends the conversion of diode array 2, outputs the light
8
The operation of ambient light sensing (ALS) within the
ISL29013 utilizes two diodes, D1 and D2. The diodes are
measured sequentially and their outputs are converted with
an ADC. The output of the ALS is the difference between
these two measurements. In typical applications, the
ISL29013 is installed behind a dark cover window. In this
low-light condition, both D1 and D2 operate linearly and the
ALS output is linear as well (Figures 18 and 19). In brighter
environments, however, D1 and D2 can be subject to
saturation. As the ambient light grows bright enough to
subject one or both diodes to saturation, the ALS count
(output) decreases and eventually reaches zero in deep
saturation (Figure 17). When using the ISL29013 in high lux
applications, be sure to choose a low R EXT to avoid
saturation at Range4, the lowest gain. For example,
R EXT = 25k Ω is recommended with ambient light near
FN6485.3
November 11, 2011
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