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ISL29030A
TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES
Typical Circuit
ALS_RANGE
0
1
α RANGE
(Lux/Count)
0.0326
0.522
A typical application for the ISL29030A is shown in Figure 5. The
ISL29030A I 2 C address is internally hardwired as 0b1000100.
The device can be tied onto a system I 2 C bus together with other
I 2 C compliant devices.
Table 15 shows two different scale factors: one for the low range
(ALS_RANGE = 0) and the other for the high range
(ALS_RANGE = 1).
Noise Rejection
Charge balancing ADCs have excellent noise-rejection
characteristics for periodic noise sources for which frequency is an
integer multiple of the conversion rate. 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. Since wall sockets
may output at 60Hz or 50Hz, the factory-set integration time is
100ms, which is the lowest common integer number of cycles for
both frequencies.
Proximity Detection of Various Objects
Proximity sensing relies on the amount of IR reflected back from
objects. A perfectly black object absorbs all light and reflects no
photons. The ISL29030A is sensitive enough to detect black ESD
foam, which reflects only 1% of IR. For biological objects, blonde
hair reflects more than brown hair, and customers may notice that
skin tissue is much more reflective than hair. IR penetrates into
the skin and is reflected or scattered back from within. As a result,
the proximity count peaks at contact and monotonically decreases
as skin moves away. The reflective characteristics of skin are very
different from that of paper.
Soldering Considerations
Convection heating is recommended for reflow soldering; direct-
infrared heating is not recommended. The plastic ODFN package
does not require a custom reflow soldering profile, and is qualified to
+260°C. A standard reflow soldering profile with a +260°C
maximum is recommended.
Suggested PCB Footprint
It is important that users see TB477 , “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
Layout Considerations
The ISL29030A is relatively insensitive to layout. Like other I 2 C
devices, it is intended to provide excellent performance, even in
significantly noisy environments. To ensure best performance,
route the supply and I 2 C traces as far as possible from all
sources of noise, and place a 0.1μF and 1μF power supply
decoupling capacitor close to the device.
ALS Sensor Window Layout
Special care should be taken to ensure that the sensor is
uniformly illuminated, as shown in Figure 16, “8 LD ODFN
SENSOR LOCATION OUTLINE - DIMENSIONS IN mm”. Shadows
from window openings that affect uniform illumination can
distort measurement results.
V I2C_PULL-UP
V DD
V IR-LED
R1
10k ?
R2
10k ?
R3
10k ?
I 2 C MASTER
MICROCONTROLLER
INT
SDA
SCL
V
SLAVE_0
SLAVE_1
I 2 C SLAVE_n
1
3.5k ?
I ALS
IRDR
8
SDA
SDA
C1
1μF
C2
0.1μF
2
3
VDD
GND
INT
SDA
7
6
SCL
SCL
4
REXT
SCL
5
REXT
499k ?
ISL29030A
FIGURE 5. ISL29030A TYPICAL CIRCUIT
11
FN7722.2
November 12, 2012
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