Si1120 Infrared Proximity and Ambient Light Sensor

Si1120 sensors are high-sensitivity active infrared proximity and ambient light sensor ICs, enabling innovative touchless human interface applications with ultra-low power advantages.

The high-sensitivity infrared photodiode provides a single-pulse infrared proximity measurement, offering customers an opportunity to implement a proximity and ambient light sensor with ultra-low power levels. Consisting of an infrared LED driver, an infrared photodiode, an ambient light sensor and control logic, the device is packaged in a 3x3 mm clear DFN.

PWM output

Si1120 Optical Sensor Common Specs

  • PWM output
  • Ambient light sensor
  • Seven precision optical measurement modes:
    • 3 proximity ranges
    • 3 dc ambient light sensing ranges
    • 1 calibration mode
  • Low-noise ambient cancelling circuit allows maximum sensitivity with 8–12 bit resolution 
  • Works in direct sunlight (100 klux)
  • Minimum reflectance sensitivity <1 μW/cm2
  • High EMI immunity without shielded packaging
  • Power supply: 2.2–3.7 V
  • Operating temperature range: –40 to +85 °C
  • Typical 10 μA current consumption
  • Programmable 400/50 mA LED constant current driver output
  • Allows independent LED supply voltage


Find the Right Si1120 Device Select Columns
Select Columns
Part Number Description UV Index LEDs Proximity Ambient Light Sensor Interface Package Type Package Size (mm)
Proximity + ambient light sensor 1 Motion Sensing PWM DFN8 3x3

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