ISL29044IROMZ-T7 Datasheet, PDF (16/19 Pages) Intersil Corporation – Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output

ISL29044
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. However, this
device requires a special solder reflow profile as mentioned in
Figure 4 in TB487 (Surface Mount Assembly Guidelines for
Optical Co-Package Sensor and LED).
Typical Circuit
A typical application for the ISL29044 is shown in Figure 22. The
ISL29044’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.
Layout Considerations
The ISL29044 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. 0.1µF and 1µF power supply decoupling
capacitors need to be placed close to the device.
V_LED
V_PULLUP
I²C SLAVE 0
5 _LED-
6 _IRDR
7 _INT
8 _SDA
LED+ ⁴
GND ³
SCL ²
VDD ¹
ISL29044 C1
0.1µF
C3
0.1µF
R1
RES1
VDD
I²C SLAVE 1
C2
1µF
SCL
SDA
I²C SLAVE_n
SCL
SDA
I²C-DIAGRAM
I²C-DIAGRAM
R2
RES1
R3
RES1
I²C MASTER
SCL
SDA
INT
CONTROLLER
FIGURE 22. ISL29044 TYPICAL CIRCUIT
16
FN8305.0
October 30, 2012