ISL29030A Datasheet, PDF (11/16 Pages) Intersil Corporation – Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt

ISL29030A
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.
Typical Circuit
A typical application for the ISL29030A is shown in
Figure 5. The ISL29030A’s I²C address is internally
hardwired as 0b1000100. The device can be tied onto a
system’s I²C bus together with other I²C compliant
devices.
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.
(http://www.intersil.com/data/tb/TB477.pdf)
Suggested PCB Footprint
It is important that users check the “Surface Mount
Assembly Guidelines for Optical Dual FlatPack No Lead
(ODFN) Package” before starting ODFN product board
mounting.
(http://www.intersil.com/data/tb/TB477.pdf)
Layout Considerations
The ISL29030A is relatively insensitive to layout. Like
other I²C devices, it is intended to provide excellent
performance even in significantly noisy environments.
There are only a few considerations that will ensure best
performance.
Route the supply and I²C traces as far as possible from all
sources of noise. A 0.1µF and 1µF power supply decoupling
capacitors need to be placed close to the device.
V_DD
R1
10kΩ
R2
R3
10kΩ 10kΩ
V_IR-LED
V_{I2C_PULL-UP}
I²C MASTER
MICROCONTROLLER
INT
SDA
SCL
C1
1µF
C2
0.1µF
V
SLAVE_0
1 _IALS
3.5kΩ
2 _VDD
IRDR ⁸
7
INT
3 _GND
4
REXT
SDA ⁶
5
SCL
REXT ISL29030A
499kΩ
SLAVE_1
SDA
SCL
I²C SLAVE_n
SDA
SCL
FIGURE 5. ISL29030A TYPICAL CIRCUIT
11
FN7722.0
November 18, 2010