13
FN6221.0
December 21, 2006
Suggested PCB Footprint
Footprint pads should be a nominal 1-to-1 correspondence
with package pads. The large exposed central die-mounting
paddle in the center of the package has no electrical
connection. It is, however, recommended to have the
thermal pad soldered to GND for package reliability.
Layout Considerations
The ISL29004 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.
Route the supply and I
2
C traces as far as possible from all
sources of noise. Use two power-supply decoupling
capacitors, 4.7µF and 0.1µF, placed close to the device.
Typical Circuit
A typical application for the ISL29004 is shown in Figure 7.
Additional I
2
C address select pins A0 and A1 are available
for the ISL29004 so a maximum of four ISL29004 devices
can be tied on the same I
2
C bus line.
Soldering Considerations
Convection heating is recommended for reflow soldering;
direct-infrared heating is not recommended. The ISL29004’s
plastic ODFN package does not require a custom reflow
soldering profile, and is qualified up to +260°C. A standard
reflow soldering profile with a +260°C maximum is
recommended.
Special Handling
ODFN8 is rated as JEDEC moisture level 4. Standard
JEDEC Level 4 procedure should be followed: 72hr floor life
at less than +30°C 60% RH. When baking the device, the
temperature required is +110°C or less due to its special
molding compound.
FIGURE 6. SUGGESTED PCB FOOTPRINT
Dimensions in mm
FIGURE 7. ISL29004 TYPICAL CIRCUIT
VDD
1
GND
2
REXT
3
A0
4
A1
5
INT
6
SCL
7
SDA
8
ISL29004
VDD
1
GND
2
REXT
3
A0
4
A1
5
INT
6
SCL
7
SDA
8
ISL29004
REXT1
100K
REXT2
100K
C1
0.1uF
I2C SLAVE_44
C2
0.1uF
VDD VDD
I2C SLAVE_45
MICROCONTROLLER
SDA
SCL
I2C MASTER
VDD
1
GND
2
REXT
3
A0
4
A1
5
INT
6
SCL
7
SDA
8
ISL29004
REXT3
RES1
C3
0.1uF
VDD
I2C SLAVE_46
VDD
1
GND
2
REXT
3
A0
4
A1
5
INT
6
SCL
7
SDA
8
ISL29004
REXT4
RES1
C4
0.1uF
VDD
I2C SLAVE_47
R1
10K
R2
10K
ISL29004
