Description
The Si1132 is a low-power, ultraviolet (UV) index, and ambient light sensor with I2C digital interface and programmable-event interrupt output. This sensor IC includes an analog-to-digital converter, integrated high-sensitivity visible and infrared photodiodes, and digital signal processor. The Si1132 offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The Si1132 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. The Si1132 devices are provided in a 10-lead 2x2 mm QFN package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range.

FEATUREs
◾ Integrated UV index sensor
   • Digital UV Index register that can
      be read through I2C interface
   • Factory calibration to address
      part-to-part variation
◾ Integrated ambient light sensor
   • 100 mlx resolution possible,
      allowing operation under dark
      glass
   • 1 to 128 klx dynamic range
      possible across two ADC range
      settings
   • Accurate lux measurements with
      IR correction algorithm
◾ Industrys lowest power
   consumption
   • 1.71 to 3.6 V supply voltage
   • < 500 nA standby current
   • Internal and external wake support
   • Built-in voltage supply monitor and
      power-on reset controller
◾ I2C Serial communications
   • Up to 3.4 Mbps data rate
   • Slave mode hardware address
      decoding
◾ Small-outline 10-lead 2x2 mm
   QFN
◾ Temperature Range
   • –40 to +85 °C

APPLICATIONs
◾ Fitness/health electronics
◾ Smart watches
◾ Smartphone handsets
◾ Tablets
◾ Portable consumer electronics
◾ Display-backlighting control