Si115x Proximity and Ambient Light Sensor IC with I2C Interface

The Silicon Labs Si115x is an ambient light sensor, proximity, and gesture detector with an I2C digital interface and programmable-event interrupt output. The sensor IC includes dual 23-bit analog-to-digital converters, an integrated high-sensitivity array of visible and infrared photodiodes, a digital signal processor, and up to three integrated LED drivers with programmable drive levels. 

The Si115x offers excellent performance under a wide dynamic range and a variety of light sources, including direct sunlight. The Si115x can also work under dark glass covers. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise and natural light flutter noise. With two or more LEDs, the Si115x is capable of supporting multiple-axis proximity motion detection. 



  • Proximity detector
    • Proximity detection adjustable from under 1 cm up to 200 cm
    • Up to 3 independent LED drivers
    • 30 current settings from 5.6 mA to 360 mA for each LED driver
    • Operates in direct sunlight with optional on-die 940 nm passband filter (Si115x-09, Si1153-9x)
  • Industry's lowest power consumption
    • 1.62 to 3.6 V supply voltage
    • 9 µA average current (LED pulsed 24.4 µs every 800 ms at 180 mA plus 3 µA Si115x supply)
    • < 500 nA standby current
    • 24.4 µs LED "on" time keeps total power consumption duty cycle low without compromising performance or noise community
    • Internal and external wake support
    • Built-in voltage supply monitor and power-on reset controller
  • Ambient light sensor
    • < 100 mlx resolution possible, allowing operation under dark glass
    • Up to 128 klx dynamic range possible across two ADC range settings
  • I²C Serial communications
    • Up to 400 kbps data rate
    • Slave mode hardware address decoding
  • Two package options
    • 10-lead 2 x 2 x 0.65 mm QFN
    • 10-lead 2.9 x 4.9 x 1.2 mm module with integrated 940 nm LED
  • Temperature Range: – 40 to +85 °C

Si115x Sensor Product Matrix

Part Number Data Sheet Dev Kit LEDs LED Drivers Ambient Light Sensor Interface Package Type Package Size (mm)
115xOPT-EXP-EVB 0 1 Yes I2C QFN10 2x2
115xOPT-EXP-EVB 0 1 No I2C QFN10 2x2
115xOPT-EXP-EVB 0 2 Yes I2C QFN10 2x2
115xOPT-EXP-EVB 0 2 No I2C QFN10 2x2
115xOPT-EXP-EVB 0 3 Yes I2C QFN10 2x2
115xOPT-EXP-EVB 0 3 No I2C QFN10 2x2
115xOPT-EXP-EVB 1 3 No I2C LGA Module 2.9x4.9
Contact Sales
Loading Results