Template: UV Sensor C Spec

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Overview

V Sensor (C) is an I2C digital UV sensor expansion board equipped with LTR390-UV-01, which can be used to measure UV and human visible light and can output light intensity data. UV Sensor (C) has the characteristics of sensitive sensing, fast response, and small size. Its core sensor LTR390-UV-01 is integrated on an expansion board (27 × 20mm), which can be easily integrated into the device.

Product Features

  • Using LTR390-UV-01, can measure ultraviolet and visible light of the human eye.
  • Built-in ADC, can directly output light intensity through the I2C interface, not easy to be disturbed by noise.
  • With interrupt output and programmable upper and lower thresholds.
  • On-board level conversion circuit, compatible with 3.3V/5V working level.
  • Provide complete supporting information manual (Raspberry/Arduino/STM32 sample program and user manual, etc.)


Specifications

  • Operating voltage: 3.3V/5V
  • Sensor: LTR390-UV-01
  • Response wavelength: 280 - 430nm
  • Communication interface: I2C (fixed address: 0 x 53)
  • Product size: 27 × 20mm
  • Fixed aperture: 2.0mm

Applications

  • Ultraviolet tester
  • Outdoor ultraviolet detector
  • Germicidal lamp

Interface Description

  • Pin function
Pin Number Identification Pin Description
1 VCC 3.3V/5V power supply positive
2 GND Power Ground
3 SDA I2C data line
4 SCL I2C clock line
4 INT Interrupt output


Hardware Description

Chip

This product adopts the LTR-390UV-01 UV sensor, which is an integrated low voltage I2C ambient light sensor (ALS) and UV light sensor (UVS), using a single microchip (2 x 2mm) lead-free surface mount package. The sensor converts light intensity into a digital output signal that can be directly used with the I2C interface. It provides a linear ALS response over a wide dynamic range, making it ideal for applications in high brightness environments. The sensor has programmable interrupts with a hysteretic response to events, eliminating the need to poll the sensor for readings, and improving system efficiency.

Communication Protocol

I2C communication requires a data cable and a clock wire. Normally, the I2C bus has three signals during transmission: start, end, and response.
TSL25911 Light Sensor-1.png
Start signal: When SCL is at a high level, SDA transitions from high level to low level to start transmitting data.
End signal: When SCL is at a high level, SDA transitions from a low level to a high level, ending data transfer.
Response signal: After receiving the 8bit data, the IC that receives the data sends a specific low-level pulse to the IC that sends the data, indicating that the data has been received.

Hardware Description

Chip

This product adopts the LTR-390UV-01 UV sensor, which is an integrated low voltage I2C ambient light sensor (ALS) and UV light sensor (UVS), using a single microchip (2 x 2mm) lead-free surface mount package. The sensor converts light intensity into a digital output signal that can be directly used with the I2C interface. It provides a linear ALS response over a wide dynamic range, making it ideal for applications in high brightness environments. The sensor has programmable interrupts with a hysteretic response to events, eliminating the need to poll the sensor for readings, and improving system efficiency.