Si1120 Proximity and Ambient Light Sensor ICs

The Si1120 is a high-sensitivity active infrared proximity and ambient light sensor IC, enabling innovative touchless human interface applications with ultra-low power advantages. Consisting of an infrared LED driver, an infrared photodiode, an ambient light sensor and control logic, the device is packaged in a 3 mm x 3 mm clear DFN. 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 very low power levels.
 
 

Features

  • 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
 
 

Applications

Documentation

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Data Sheet (2)

User Guides (1)

DescriptionVersionUpdatedSize
Si1120-EK User's Guide
0.37/18/2013211 kB

Quick Start Guide (1)

DescriptionVersionUpdatedSize
Si1120-EK Quick-Start Guide
0.310/21/2009234 kB

Application Notes (1)

DescriptionVersionUpdatedSize
AN442: Si1102 and Si1120 Designer's Guide
0.110/27/2009176 kB

PCN (3)

Design Tools

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Software (1)

DescriptionVersionUpdatedSize
Si1120-EK MCU Firmware and Example Code
7/16/201392 kB

Schematics/Layout (2)

Product Matrix
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Part NumberDescriptionUV IndexLEDsGesture/Motion SensingAmbient Light SensorInterfacePackage TypePackage SizeDev Kit
Si1120-A-GMProximity + Ambient Light SensorNo1Motion SensingYesPWMODFN83x3 mmSi1120EK

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