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ISL29010
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
plastic material. A thickness of t = 1mm is recommended for
a window lens design. The bigger the diameter of the
window lens, the wider the viewing angle is of the ISL29010.
Table 12 shows the recommended dimensions of the optical
window to ensure both 35° and 45° viewing angle. These
dimensions are based on a window lens thickness of 1.0mm
and a refractive index of 1.59.
WINDOW LENS
t
count DATA, and starts over again to commence conversion
of diode array 1.
?
D1
D TOTAL
The integration time, t INT , is the sum of two identical time
intervals between the three sync pulses. t INT is determined
t INT = ---------------
? = VIEWING ANGLE
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
ISL29013
D LENS
DATA
E= x 2000
2 15
FIGURE 4. FLAT WINDOW LENS
TABLE 12. RECOMMENDED DIMENSIONS FOR A FLAT
WINDOW DESIGN
internal and external timing modes, with the same
D LENS @ 35
D LENS @ 45
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.
D TOTAL
1.5
2.0
2.5
3.0
D1
0.50
1.00
1.50
2.00
VIEWING ANGLE
2.25
3.00
3.75
4.30
VIEWING ANGLE
3.75
4.75
5.75
6.75
t INT < ------------------
65,535
f OSC
(EQ. 13)
3.5
t=1
2.50
Thickness of lens
5.00
7.75
f OSC = 327kHz*100k Ω /R EXT . When Range/Gain is set to
Range1 or Range2.
D1
D LENS
D TOTAL
Distance between ISL29010 and inner edge of lens
Diameter of lens
Distance constraint between the ISL29010 and lens
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
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
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.
Flat Window Lens Design
A window lens will surely limit the viewing angle of the
ISL29010. The window lens should be placed directly on top
of the device. The thickness of the lens should be kept at
minimum to minimize loss of power due to reflection and
also to minimize loss due to absorption of energy in the
8
outer edge
* All dimensions are in mm.
Suggested PCB Footprint
It is important that the users check the “Surface Mount
Assembly Guidelines for Optical Dual FlatPack No Lead
(ODFN) Package” before starting ODFN product board
mounting.
Layout Considerations
The ISL29010 is relatively insensitive to layout. Like other
I 2 C devices, it is intended to provide excellent performance
even in significantly noisy environments. There are only a
few considerations that will ensure best performance.
FN6414.1
November 11, 2011
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