Si1133 UV Index and Ambient Light Sensor with I2C Interface

The Silicon Labs Si1133 is a UV Index and ambient light sensor with I²C digital interface and programmable-event interrupt output. The sensor IC includes dual 23-bit analog-to-digital converters, integrated high-sensitivity array of UV, visible and infrared photodiodes, and a digital signal processor.  

The Si1133 is provided in a 10-lead 2 x 2 mm QFN package and capable of operation from 1.62 to 3.6 V over the –40 to +85 °C temperature range.



  • Optional high accuracy UV index sensor
    • Unique on-die filter closely matches erythermal curve
  • Ambient light sensor
    • < 100 mix resolution possible, allowing operation under dark glass
    • Up to 128 kix dynamic range possible across two ADC range settings
  • Industry's lowest power consumption
    • 1.62 to 3.6 V supply voltage
    • < 500 nA standby current
    • Internal and external wake support
    • Built-in voltage supply monitor and power-on reset controller

Si1133 Product Matrix

Part Number Data Sheet Dev Kit Description UV Index LEDs Ambient Light Sensor Interface Package Type Package Size
115xOPT-EXP-EVB UV Sensor Improved performance Yes 0 Yes I2C QFN10 2x2
Contact Sales
Loading Results