Gravity: LTR390 UV Light Sensor (280nm to 430nm) - I2C & UART

This Gravity: LTR390-UV sensor from DFRobot, provides both ambient light, and UV sensing, with UV spectral response from 280nm to 430nm, and raw data output. It has high sensitivity, quick response, and strong anti-interference ability.

With built-in ADC and MCU, this UV module can convert light data to a digital signal capable of being output via I2C or UART interface. It can be used for light experiments, outdoor UV detection, and other scenarios requiring UV or ambient light monitoring.

Connection Examples:

I2C Connection Diagram

UART Connection Diagram

Features

• Support I2C and UART communication
• 3.3V & 5V compatible
• 13 to 20 bits effective resolution
• Adjustable gain range: 1, 3, 6, 9 and 18
• Interrupt function, programmable upper and lower thresholds
• Close to human eye spectral response

Specifications

• Chip: LTR390-UV-01
• Operating Voltage: DC 3.3V to 5V
• Operating Current: about 2.73mA (18-bit data acquisition with a time of 100ms)
• Communication Interface: I2C, UART
• UV Response Wavelength: 280nm to 430nm
• ALS Spectral Response Wavelength: 450nm to 700nm
• Output Type: digital output
• Dimension: 32mm×27mm

Resources

• Product wiki
• STP 3D Model
• 2D CAD Dimension
• 2D_CAD
• Schematics
• UV Datasheet

Pinout

Label	Full Name	Description
D/T	SDA/TXD	I2C Data Line/UART Transmit Data
C/R	SCL/RXD	I2C Clock Line/UART Receive Data
-		Power -
+		Power + (DC 3.3V-5V)

Package Contents

• 1x Gravity: LTR390-UV Sensor
• 1x Gravity-4P I2C/UART Sensor Cable