The QuickSense Si1120 is the industry’s most sensitive active infrared proximity 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 infrared light emitting diodes with unusually low power levels. When combined with a Silicon Labs capacitive touch-sense microcontroller (MCU), the Si1120 proximity and ambient light sensor IC is capable of advanced motion and gesture recognition.
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
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