Si1102 Infrared Proximity Sensors

Si1102 sensors are high-sensitivity active infrared proximity sensor ICs containing an infrared LED driver, infrared photodiode and control logic. Like all of our optical sensors, the Si1102 uses a single-pulse infrared proximity measurement with ultra-low power consumption, making it ideal for battery-powered applications.  With no software interface, Si1102 operates completely autonomously, eliminating the need for an external MCU. Configuration of the Si1102 is performed with just two external resistors. The device is packaged in a 3x3 mm clear 8-pin ODFN package. 

Digital On/Off

Si1102 Optical Sensor Common Specs

  • High-performance single-pulse infrared proximity detector with a sensing range of up to 50 cm
  • Hardware configuration and fully autonomous operation requires no external MCU or software development
  • Threshold reflectance principle overcomes ambiguity associated with motion-based systems
  • Adjustable detection threshold and strobe frequency
  • Proximity (PRX) status latched between consecutive strobes
  • High EMI immunity without shielded packaging
  • 2 to 5.5 V power supply
  • Operating temperature range: –40 to +85 °C
  • Typical 10 μA current consumption
  • Current driven (400 mA) or saturated LED driver output
  • Cancels dc ambient of at least 100 klux (direct sunlight)


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Part Number Description UV Index LEDs Ambient Light Sensor Interface Package Type Package Size (mm) Proximity
Infrared proximity sensor 1 Digital On/Off DFN8 3x3

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