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Low Voltage I2C Digital Ambient Light Sensor - LTR-329ALS-01

  • Low Voltage I2C Digital Ambient Light Sensor
  • Low Voltage I2C Digital Ambient Light 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-329ALS-01
  • Data Sheet: Date Sheet File
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Product Specification

LTR-329ALS-01 Ambient Light Sensor Description
The LTR-329ALS-01 is a low voltage I2C digital light sensor [ALS] in a low cost 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. There are altogether six gain settings (1X, 2X, 4X, 8X, 48X and 96X) available for user to configure. 

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-329ALS-01 Ambient Light 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

LTR-329ALS-01 Ambient Light 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-329ALS-01 Ambient Light 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
4.36 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 Standby

10 ms (Note 1)

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

65535
 count
 Full Scale ADC Count
Dark ADC Count
 0
6 count
 Ch0, Lux = 0
0
6 count
 Ch1, Lux = 0
ADC Count (Gain=96)
830
3250

1550
6100
count
count
Ch0, Lux = 200 (White LED)
Ch1, Lux = 200 (White LED)
Integration Time : 50ms
Measurement Time : 100ms
ALS Ratio
 0.15
0.35 Ratio
 Ratio = Ch1/(Ch1 + Ch0),
Lux = 200 (White LED)

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