Integrated I2C Digital Ambient Light and Proximity Sensor - LTR-553ALS-01

  •  Integrated I2C Digital Ambient Light and Proximity Sensor
  •  Integrated I2C Digital Ambient Light and Proximity Sensor
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• I2C interface (Fast Mode @ 400kbit/s)
• Ultra-small ChipLED package
• Built-in temperature compensation circuit
• Low active power consumption with standby mode
• Supply voltage range from 2.4V to 3.6V capable of 1.7V logic voltage
• Operating temperature range from -30°C to +70°C
• RoHS and Halogen free compliant

  • Model Number: LTR-553ALS-01
  • Data Sheet: Date Sheet File
Quantity:
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Product Specification

LTR-553ALS-01 Ambient Light Sensor and Proximity Sensor Description

The LTR-553ALS-01 is an integrated low voltage I2C digital light sensor [ALS] and proximity sensor [PS] with built-in emitter, in a single miniature chipled lead-free surface mount package. This sensor converts light intensity to a digital output signal capable of direct I2C interface. It provides a linear response over a wide dynamic range from 0.01 lux to 64k lux and is well suited to applications under high ambient brightness. With built-in proximity sensor (emitter and detector), LTR-553ALS-01 offers the feature to detect object at a user configurable distance.


The sensor supports an interrupt feature that removes the need to poll the sensor for a reading which improves system efficiency. The sensor also supports several features that help to minimize the occurrence of false triggering. This CMOS design and factory-set one time trimming capability ensure minimal sensor-to-sensor variations for ease of manufacturability to the end customers.

LTR-553ALS-01 Ambient Light Sensor and Proximity Sensor Features
• I2C interface (Fast Mode @ 400kbit/s)
• Ultra-small ChipLED package
• Built-in temperature compensation circuit
• Low active power consumption with standby mode
• Supply voltage range from 2.4V to 3.6V capable of 1.7V logic voltage
• Operating temperature range from -30°C to +70°C 
• RoHS and Halogen free compliant
•   Light Sensor 
    - Close to human eye spectral response
    - Immunity to IR / UV Light Source 
    - Automatically rejects 50 / 60 Hz lightings flicker
    - 6 dynamic range from 0.01 lux to 64k lux
    - 16-bit effective resolution
•   Proximity Sensor 
    - Built-in LED driver, emitter and detector
    - Programmable LED drive settings
    - 11-bit effective resolution
    - High ambient light suppression

LTR-553ALS-01 Ambient Light Sensor and Proximity Sensor Applications
To control display backlight in
• Mobile Devices: Mobile phone, PDA
• Computing Devices: Notebook PC, Desktop Monitor
• Consumer Devices: LCD/PDP TV backlight systems, Cameras, Personal Navigation Device, Digital Photo Frame
• Dashboard

LTR-553ALS-01 Ambient Light Sensor and Proximity Sensor Ratings and Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Rating
Unit
Supply Voltage
VDD
3.8 V
Digital Voltage Range
SCL, SDA, INT
-0.5 to 3.8
V
Digital Output Current
SCL, SDA, INT
-1 to 20
mA
Storage Temperature
Tstg
-40 to 100
°C
Note: Exceeding these ratings could cause damage to the sensor. All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal.

Recommended Operating Conditions
Description
Symbol
Min.
Typ.
Max.
Unit
Supply Voltage
VDD
2.4
3.6
V
LED Supply Voltage
VLED
2.5
4.35 V
Interface Bus Power Supply Voltage
VIO
1.7
3.6
V
Operating Temperature
Tope
-30
70 °C

Electrical & Optical Specifications 
All specifications are at VDD = 3.0V, Tope= 25°C, unless otherwise noted.
Parameter
Min.
Typ.
Max.
Unit
Condition
Active Supply Current


250 uA
Active Mode, Tope = 25°C
Standby Current


5 uA
Standby / Sleep Mode
Initial Startup Time
60 100 1000 ms (Note 1)
Wakeup Time from Standb


10 ms
(Note 1)

Light Sensor
Parameter
Min.
Min.
Max.
Unit
Condition
Full Scale ADC Count


65535
count

Dark ADC Count
0
6 count
Ch0, Lux = 0
0
6 count
Ch1, Lux = 0
ADC Count (Gain=8)
520

1070
count
Ch0
White LED 200 Lux
Integration Time : 50ms
Measurement Time : 100ms
180

390 count
Ch1
White LED 200 Lux
Integration Time : 50ms
Measurement Time : 100ms
ALS Ratio
0.15
0.26 0.35
Ratio = Ch1/(Ch1 + Ch0)
Lux = 200 (White LED)

Proximity Sensor
Parameter
Min.
Typ.
Max.
Unit
Condition
Full Scale ADC Count


2047
count

Peak Sensitivity
840
855 870
nm
Detection Distance
20

nm 100mA, 4 pulses, 
18% Gray card
Ambient Light Suppression


50k
Lux
Direct sunlight
LED Pulse Count
1
15 Pulses

LED Pulse Frequency
30k

100k
Hz
Increment of 10k Hz
LED Duty Cycle
25
100 % Increment of 25%
LED Peak Current

5
mA
LED Peak Current = 000

10
mA
LED Peak Current = 001

20
mA LED Peak Current = 010

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