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Integrated Low Voltage I2C Ambient Light Sensor - LTR-308ALS-01

  • Integrated Low Voltage I2C Ambient Light Sensor
  • Integrated Low Voltage I2C Ambient Light Sensor
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• I2C interface
• Ambient Light in ultra-small chipled package
• Very low power consumption with sleep mode capability
• Operating voltage ranges: 1.7V to 3.6V
• Operating temperature ranges: -40 to +85°C
• RoHS and Halogen free compliant

  • Model Number: LTR-308ALS-01
  • Data Sheet: Date Sheet File
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Product Specification

LTR-308ALS-01 Ambient Light Sensor Description
The LTR-308ALS-01 is an integrated low voltage I2C ambient light sensor (ALS) in a single 2x2mm miniature chipled lead-free surface mount package.

The ALS provides a linear response over a wide dynamic range, which is well suited to applications under very low or bright ambient brightness. 

The sensor has a programmable interrupt with hysteresis to response to events and that removes the need to poll the sensor for a reading which improves system efficiency. 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-308ALS-01 Ambient Light Sensor Application
Control brightness of display panel in mobile, computing, and consumer devices.

LTR-308ALS-01 Ambient Light Sensor Features 
• I2C interface (Standard mode @100kHz or Fast mode @400kHz)
• Ambient Light in ultra-small chipled package
• Very low power consumption with sleep mode capability
• Operating voltage ranges: 1.7V to 3.6V
• Operating temperature ranges: -40 to +85°C
• Built-in temperature compensation circuit
• Programmable interrupt function for ALS with upper and lower thresholds
• RoHS and Halogen free compliant
•   ALS Features
    - 16 to 20 bits effective resolution
    - Wide dynamic range (0.01 to 157K lux) with linear response
    - Close to human eye spectral response
    - Automatic rejection for 50Hz/60Hz lighting flicker

LTR-308ALS-01 Ambient Light Sensor Rating and Specification
Absolute Maximum Rating at Ta=25°C

Parameter
 Symbol
 Min.
 Max.
 Unit
Supply Voltage
 VDD
4.0
 V
Digital Voltage Range
 SCL, SDA, INT
 -0.5
 4.0
 V
Storage Temperature
 Tstg
 -40
 100
 °C
Electrostatic Discharge Protection
(Human Body Model JESD22-A114)
 VHBM
2000 V
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
 1.7
3.6 V
Interface signal input high
 VI2Chigh
 1.5
VDD
 V
Interface signal input low
 VI2Clow
 0
0.4 V
Operating Temperature
 Tope
 -40
85 °C

Electrical Specifications (VDD = 1.8V, Ta=25°C, unless otherwise noted)
Parameter
 Min.
 Typ.
 Max.
 Unit
 Condition
Active Supply Current
110
uA
 Max. duty cycle, Vdd=1.8V, Gain 3x
andby Current
1
uA
 Shutdown Mode
Wakeup Time from Standby
5 10 ms From Standby to Active mode where 
measurement can start

Characteristics Ambient Light
Parameter
 Min.
 Typ.
 Max.
 Unit
 Condition
ALS Resolution
 16
20 Bit
 Programmable for 16, 17, 18, 19, 20 Bit
ALS Lux accuracy
 -10
10 % White LED, 5000K, Ta = 25°C
Dark Level Count
0 5 Count
 0 Lux, 18-bit resolution
Integration time
 50
400 ms With 50/60Hz Rejection
50/60 Hz flicker noise error
 -5
+5 %

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