Specifications

70 Control and Automation Solutions Guide
Integrated Digital Ambient Light and
Proximity Sensor
MAX44000
The MAX44000 combines a wide dynamic range ambient light sensor with an
integrated infrared proximity sensor.
While sensing both ambient light and proximity, the supply current, including the
external IR LED current, can be as low as 11A (time averaged).
The on-chip ambient light sensor operates over an extremely wide dynamic range
(0.03 lux to 65,535 lux). To improve noise immunity, an on-chip IR proximity detector
is matched with an integrated driver for the external IR LED. All readings are available
on an I
2
C communication bus. A programmable interrupt pin minimizes the need
to poll the device for data, freeing up microcontroller resources, reducing system
software overhead, and ultimately, reducing power consumption.
Benefits
• Minimizes power requirements
Ultra-low 1µA operating current
consumption
V
CC
is 1.7V to 3.6V, reducing the
need for multiple supply rails
• Works in any lighting condition for
valid measurements
Excellent IR and sunlight rejection
for reliable proximity sensor
operation
Superior light source matching for
robust operation
• High integration simplifies system
design
Sensors and ADCs are integrated
in a tiny 2mm x 2mm x 0.6mm
package
Built-in digital functions help to
reduce time to market and reduce
computation overhead for the
microcontroller
14-BIT
IR LED
DRV
VIS + IR
(ALS)
IR (ALS)
IR (PRX)
V
LED
V
DD
14-BIT
ALS
PGA
ALS
PGA
8-BIT
SDA
SCL
INT
V
DD
GND
MICROCONTROLLER
GND
MAX44000
PROXIMITY
RECEIVER
I
2
C