Si114x Ultraviolet (UV) Index, Gesture, Proximity and Ambient Light Sensor ICs

The monolithic Si114x sensors integrate multiple photodiodes, an analog-to-digital converter, a signal processor, up to 3-LED drivers and a digital I2C control interface in an impressively small 2 mm x 2 mm clear QFN package. This low-power sensing family enables long battery life with standby less than 500 nA and an average power of as little as 1.2 uA with once per second real-time UV Index measurements. Capable of controlling one, two and three-LED systems, the sensors enable developers to implement proximity detection with a range over 50 cm, multi-dimensional systems capable of advanced 2D/3D motion sensing, heart rate/pulse oximetry measurements, or cheek detection. The robust sensing architecture works in direct sunlight and includes an ambient light sensor capable of sensing light levels up to 128 kLux. The Si114x family is supported within the optical sensor software tools.


  • Ultra-sensitive photodiodes with up to 3 independent LED drivers enable multiple functions
    • Heart rate and blood oximetry measurements
    • Over 50 cm proximity detection
    • Advanced 2D and 3D gesture detection
    • Cheek detection for handsets
  • Ambient light sensor
    • Enables accurate light level monitoring under mixed lighting
    • Automatic backlight control for improved end user visual experience and reduced backlight energy
  • Optional digital UV Index sensor
    • Determine real-time UV sun exposure and cumulative UV sun exposure
  • Low-power sensors, signal processor, and ADC enable long battery life
    • As little as 1.2 µA average current with once per second UV Index measurements
    • Innovative single-pulse proximity sensor minimizes on-time of IrLED to 25.6 µs – the primary energy consumer
    • 9 µA average proximity sensing current (LED pulsed 25.6 µs every 800 ms at 180 mA plus 3 µA Si114x supply)
    • Dynamic adjustment of LED currents minimizes power consumption and optimizes performance
    • 1.7 to 3.6 V supply voltage
    • < 500 nA standby current
  • I2C interface for ease of communication with host MCU
  • 0.1 to 128 kLux dynamic range enables operation in direct sunlight
  • Minimum reflectance sensitivity of <1uW/cm2
  • Tiny 2 mm x 2 mm clear QFN package
  • Operating temperature: – 40 to 85 °C



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Data Sheet (4)

User Guides (6)

Quick Start Guide (4)

Application Notes (7)

White Papers (2)

PCN (4)

Product Matrix
Part NumberDescriptionUV IndexLEDsGesture/Motion SensingAmbient Light SensorInterfacePackage TypePackage SizeDev Kit
Si1141Proximity + Ambient Light SensorNo1Motion SensingYesI2CQFN102x2 mmSi1140DK
Si1142Proximity + Ambient Light SensorNo22D Gesture SensingYesI2CQFN102x2 mmSi1140DK
Si1143Proximity + Ambient Light SensorNo33D Gesture SensingYesI2CQFN102x2 mmSi1140DK
Si1145UV + Proximity + Ambient Light SensorYes1Motion SensingYesI2CQFN102x2 mmUVIRSLIDER2EK
Si1146UV + Proximity + Ambient Light SensorYes22D Gesture SensingYesI2CQFN102x2 mmUVIRSLIDER2EK
Si1147UV + Proximity + Ambient Light SensorYes33D Gesture SensingYesI2CQFN102x2 mmUVIRSLIDER2EK
    Silicon Labs' Si114x optical sensor products offer superior range and sensitivity while keeping power demands low. Use this optical sensor current estimator utility to help you determine the current consumption of your application. Specify whether you need proximity light sensing, ambient light sensing or both. Choose your channels, and view the estimated average current results in real time.


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