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PDF MAX44000 Data sheet ( Hoja de datos )
| Número de pieza | MAX44000 | |
| Descripción | Ambient and Infrared Proximity Sensor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5859; Rev 0; 10/11
Ambient and Infrared Proximity Sensor
General Description
The MAX44000 combines a wide-dynamic range ambient
light sensor with an integrated infrared proximity sensor. The
IC is a perfect solution for touch-screen portable devices.
The IC can consume as low as 11µA (time averaged) in
ambient light sensing plus proximity sensing, including
external IR LED current.
The on-chip ambient sensor has the ability to make wide
dynamic range 0.03 lux to 65,535 lux measurements. An
on-chip IR proximity detector is matched with an inte-
grated IR LED driver. All readings are available on an
I2C 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.
The IC is designed to drive an external IR LED and can
operate from a VDD of 1.7V to 3.6V. It consumes just 5µA
operating current when only the ambient light sensor is
enabled and 7µA when the proximity receiver and driver
are enabled.
Smartphones
Accessories
Industrial Sensors
Presence Detection
Applications
VLED
VDD
Features
S Tiny, 2mm x 2mm x 0.6mm UTDFN-Opto Package
S VDD = 1.7V to 3.6V
S Low-Power Operation
5µA in Ambient Mode
7µA in Ambient Plus Proximity Mode
70µA in Ambient Plus Proximity Mode,
Including 100mA LED Current
S Excellent Light Source Matching
Programmable Green and IR Channel Gains
S Integrated Single-Pulse IR LED Driver
10mA to 110mA Programmable Range
Internal Ambient Cancellation
S -40NC to +105NC Temperature Range
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX44000GDT+ -40NC to +105NC
6 OTDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit appears at end of data sheet.
Simplified Block Diagram
VDD
IR LED
VIS + IR
(ALS)
IR (ALS)
IR (PRX)
DRV
ALS
PGA
MAX44000
ALS
PGA
AMBIENT
CANCELLATION
PRX
PGA
14-BIT
14-/8-BIT
I2C
MICROCONTROLLER
SDA
SCL
INT
GND
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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Ambient and Infrared Proximity Sensor
Typical Operating Characteristics (continued)
(VDD = 1.8V, TMIN – TMAX = -40°C to +85°C, unless otherwise noted. All devices are 100% production tested at TA = +25°C.
Temperature limits are guaranteed by design.)
LIGHT SENSITIVITY vs. LUX LEVEL
1800
1600
ALSTIM[1:0] = 00
ALSPGA[1:0] = 10
1400 FLUORESCENT
1200
1000
800 INCANDESCENT
600
400
200
0
0 100 200 300 400 500 600 700 800 900 1000
REFERENCE METER READING (LUX)
SUNLIGHT REJECTION
150
NO REFLECTOR
100 PRXTIM, PRXPGA : 0x02 = 1111 xxxx
LED CURRENT: 0x03 = xxxx 1110 for 100mA
WITH NO REFLECTOR, PROX COUNT STAYED
AT 0 AT ALL lux LEVEL
WITH A BLACK GLASS AS REFLECTOR AND
50
lux LEVEL CHANGED FROM 50 TO 75000 lux
PROX COUNTS DROPPED BY 7% AT MID-ADC RANGE
PROX COUNT DROPPED BY 35% AT QUARTER
ADC RANGE
BLACK GLASS REFLECTOR
0
0 10k 20k 30k 40k 50k 60k 70k 80k
SUNLIGHT (LUX)
RADIATION PATTERN
100
90
80
70
60
50
40
30
20 ROTATED WITH AXIS BETWEEN
10 PIN 1/2/3 AND 4/5/6
0
-90 -70 -50 -30 -10 10 30 50 70 90
-80 -60 -40 -20 0 20 40 60 80
LUMINOSITY ANGLE (°)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
vs. TEMPERATURE
10
9 TA = +85°C
8
7 TA = +105°C
6
5 TA = +25°C
4 TA = -40°C
3
2
1
STANDARD AMBIENT MODE
DARKROOM CONDITION
0
1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7
SUPPLY VOLTAGE (V)
OUTPUT ERROR vs. TEMPERATURE
11
10 STANDARD AMBIENT MODE
9
DARKROOM CONDITION
VDD = 1.7 V TO 3.6V
8
7
6
5
4
3
2
1
0
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
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Ambient and Infrared Proximity Sensor
BIT 1
0
1
BIT 2
0
1
Proximity Interrupt Status (PRXINTS)
No interrupt trigger event has occurred.
OPERATION
The IR proximity receive intensity has exceeded the threshold limit for greater than persist
timer count PRXPST[1:0]. This bit also causes the INT pin to be pulled low. Once set, the only way to clear this bit is
to read this register or to set PRXINTE bit to 0.
Power-On Reset Status (PWRON)
No interrupt trigger event has occurred.
OPERATION
The part went through a power-up event, either because the part was turned on or because there was a power-
supply voltage glitch. All interrupt threshold settings in the registers have been reset to a default state and should
be examined. A 1 on this bit also causes the INT pin to be pulled low. Note: INT is not pulled low on Rev-1 of the
IC. Once this bit is set, the only way to clear this bit is to read this register.
REGISTER
Main Configuration
Main Configuration Register (0x01)
B7 B6 B5 B4 B3 B2
B1
B0
REGISTER
ADDRESS
POWER-ON
RESET
STATE
R/W
TRIM
MODE[2:0]
PRXINTE ALSINTE 0x01
0x24
R/W
This register is used to set the operating mode of the IC (ALS and/or proximity) and enable interrupt operation of the
device.
BIT 5
0
1
TRIM
OPERATION
Use bytes written to TRIM_GAIN_GREEN[7:0] and TRIM_GAIN_IR[7:0] registers to set the fine-trim gain of the
green and IR gain channels.
Use factory-programmed gains for green and IR channels. Ignore bytes written to TRIM_GAIN_GREEN[7:0] and
TRIM_GAIN_IR[7:0] registers.
The 3-bit MODE[2:0] defines eight operating modes for the IC, as shown below.
MODE[2:0]
MODE[2:0]
000
001
010
011
100
101
110
111
OPERATING
MODE
Shutdown
ALS G-IR
ALS G
ALS IR
ALS/PROX
PROX Only
Reserved
Reserved
OPERATION
Analog circuits are shut down, but the digital register retains values.
Standard ALS mode stores the difference between green and infrared channel readings.
Proximity channel operation and updates are disabled.
ALS green channel only. Proximity channel operation and updates are disabled.
Infrared channel only. Proximity channel operation and updates are disabled.
ALS and PROX are interleaved continuously.
PROX only continuously. ALS channel operation and updates are disabled.
Do not use.
Do not use.
______________________________________________________________________________________ 11
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