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Integrated Low Voltage I2C Ambient Light and Ultraviolet Light Sensor - LTR-390UV-01

  • Integrated Low Voltage I2C Ambient Light and Ultraviolet Light Sensor
  • Integrated Low Voltage I2C Ambient Light and Ultraviolet Light Sensor
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• I2C interface capable of Standard mode @100kHz or Fast mode @400kHz communication; 1.8V logic compatible
• Ambient Light / Ultraviolet light (UVS) Technology in one ultra-small 2x2mm 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
• RoHS and Halogen free compliant

  • Model Number: LTR-390UV-01
  • Data Sheet: Date Sheet File
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Product Specification

LTR-390UV-01 Ambient Light Sensor and Ultraviolet Light Sensor Description
The LTR-390UV-01 is an integrated low voltage I2C ambient light sensor (ALS) and ultraviolet light sensor (UVS) in a single miniature 2x2mm 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 ALS response over a wide dynamic range, and is well suited to applications under high 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-390UV-01 Ambient Light Sensor and Ultraviolet Light Sensor Application
• Identifying the UV index in ambient light helps people to effectively protect themselves from sunburns, cancer or eye damage.
• To control brightness and color of the display panel in mobile, computing, and consumer devices.

LTR-390UV-01 Ambient Light Sensor and Ultraviolet Light Sensor Features 
• I2C interface capable of  Standard mode @100kHz or Fast mode @400kHz communication; 1.8V logic compatible 
• Ambient Light / Ultraviolet light (UVS) Technology in one ultra-small 2x2mm 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 , UVS with upper and lower thresholds
• RoHS and Halogen free compliant
•  UVS/ALS Features
    - 13 to 20bits effective resolution
    - Wide dynamic range of 1:18,000,000 with linear response
    - Close to human eye spectral response
    - Automatic rejection for 50Hz/60Hz lighting flicker

LTR-390UV-01 Ambient Light Sensor and Ultraviolet 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
-45 to 95
 °C
Max. Input Current
 SCL, SDA, INT
 -100 100
 mA
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 = 2.8V, Ta=25°C, unless otherwise noted)
Parameter
 Min.
 Typ.
 Max.
 Unit
 Condition
ALS Active Mode Current
110
uA
 Max. duty cycle, Vdd=2.8V, 
Gain 3x
UVS Active Mode Current
100
uA
 Max. duty cycle, Vdd=2.8V
Standby Current
1
uA
 Standby / Sleep 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 Output Resolution
 13 18 20 Bit
 Programmable for 13,16,17,18,19, 20 bit
Dark Level Count
0 5 count
 0 Lux, Tope=25°C, 18-bit range
Calibrated Lux Error In 
Gain Range 3
 -10
10 % White LED, 5000K,Tope=+25°C
ALS Accuracy
 -25
25 % Across different light sources
50/60 Hz flicker noise error
 -5
5 %

Characteristics UVS Sensor
Parameter
 Min.
 Typ.
 Max.
 Unit
 Condition
UVS Output Resolution
 13 18 20 Bit
 Programmable for 13,16,17,18,19,20 bit
UV Count
160
count
 UV LED 310nm, Tope=25°C, 18-bit
Gain range=18, Irradiance =70uW/cm2
UV Sensitivity
2300
Counts/UVI
 Gain range = 18, 20-bit
UVI accuracy
-20
-1

20
1
%
UVI
Gain range = 18, 20-bit for UVI>5
UVI<5

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