ISL29020_14 Datasheet, PDF (8/11 Pages) Intersil Corporation – A Low Power, High Sensitivity, Light-to Digital Sensor With I2C Interface

D_LENS
ISL29020
D₂ > 1.5mm
LIGHT PIPE
t
L
D₂
D_LENS
ISL29020
FIGURE 5. WINDOW WITH LIGHT GUIDE/PIPE
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.
http://www.intersil.com/data/tb/TB477.pdf
Layout Considerations
The ISL29020 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. Use one 0.01µF power-supply decoupling
capacitor, placed close to the device.
R1
10kΩ
R2
10kΩ
2.25V TO 3.3V
Typical Circuit
A typical application for the ISL29020 is shown in Figure 6.
The ISL29020’s I²C address is hardwired as 1000100. 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.
1.7V TO 3.6V
I²C MASTER
MICROCONTROLLER
SDA
SCL
C1
0.01µF
I²C SLAVE_0
1 _VDD
SDA ⁶
I²C SLAVE_1
SDA
I²C SLAVE_n
SDA
2 _{GND SCL} 5
SCL
SCL
3 _REXT
A₀ ⁴
REXT
500k ^ISL29020
FIGURE 6. ISL29020 TYPICAL CIRCUIT
8
FN6505.1
August 20, 2009