Si1153 Proximity and Ambient Light Sensor IC with I2C Interface

The Silicon Labs Si1153 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 three integrated LED drivers with programmable drive levels. 

The Si1153 offers excellent performance under a wide dynamic range and a variety of light sources, including direct sunlight. The Si1153 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 Si1153 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
    • On-die 940 bandpass filter that rejects unwanted visible light and IR from daylight and other sources (Si1153-AA09)
  • 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 Si1153 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
  • Heart rate
    • Broad sensitivity from green to 940 nm (Si1153-AA09)
    • 3 LED drivers ideal for wrist applications
  • Ambient light sensor
    • < 100 mlx resolution possible, allowing operation under dark glass
    • Up to 128 klx dynamic range possible across two ADC range settings
  • Trim-able internal oscillator with typical 1% accuracy
  • 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

Si1153 Sensor Product Matrix

Part Number Data Sheet Dev Kit Description LEDs Ambient Light Sensor Interface Package Type Package Size (mm)
115xOPT-EXP-EVB Optical sensor, 3 LED drivers, improved prox 0 Yes I2C QFN10 2x2
115xOPT-EXP-EVB Optical sensor module, IR filter 0 No I2C QFN10 2x2
115xOPT-EXP-EVB Optical sensor module, IR filter 1 No I2C LGA Module 2.9x4.9
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