MAX44000 Maxim, MAX44000 Datasheet - Page 7

• Manufacturer Part Number: MAX44000
• Description: MAX44000 combines a wide-dynamic range ambient light sensor with an integrated infrared proximity sensor, making it a perfect solution for touch-screen portable devices
• Manufacturer: Maxim

The MAX44000 combines a wide-dynamic range ambi-
ent light sensor with an integrated infrared proximity
sensor. The die is placed inside an optically transparent
(UTDFN-Opto) package. A photodiode array inside the
IC converts the light to a current, which is then pro-
cessed by low-power circuitry into a digital value. The
data is then stored in an output register that is read by
an I
The IC contains three types of photodiodes: a green pho-
todiode and two types of infrared photodiodes. Ambient
light sensing (ALS) is accomplished by subtracting the
infrared ALS photodiode signal from the green ALS
photodiode signals after applying respective gains. The
PIN
2
EP
1
2
3
4
5
6
C interface.
NAME
GND
DRV
SDA
V
SCL
INT
—
DD
_______________________________________________________________________________________
Ambient and Infrared Proximity Sensor
Power Supply
Ground
IR LED Current Driver
Interrupt. Active-low output.
I
I
Exposed Pad. EP is internally connected to GND. EP must be connected to GND.
Detailed Description
2
2
C Clock
C Data
*EP = EXPOSED PAD, CONNECT TO GND.
TOP VIEW
GND
DRV
V
DD
1
2
3
+
EP*
MAX44000
infrared proximity photodiodes are optimized for better
sensitivity for near infrared signals, specifically 850nm,
and can be used for proximity sensor measurements.
In the ALS mode, the ALS photodiodes are connected to
two ADCs. The user can choose to view either just the
green ALS signal, or just the infrared ALS signal, or the
difference of the green and infrared ALS photodiodes.
In the proximity detect mode, the infrared proximity pho-
todiodes are connected to the proximity receiver circuit
and then to an 8-bit ADC.
Three key features of the IC’s analog design are its low-
power design, single-pulse proximity receive operation,
and interrupt pin operation.
FUNCTION
6
5
4
SDA
SCL
INT
Pin Configuration
Pin Description
7