Si1132 2 UV INDEX AND AMBIENT LIGHT SENSOR IC WITH I C INTERFACE Features Pin Assignments Integrated UV index sensor Industry s lowest power consumption Digital UV Index register that can DNC 2 1.71 to 3.6 V supply voltage be read through I C interface < 500 nA standby current Factory calibration to address 10 SDA 1 9 V DD part-to-part variation Internal and external wake support GND Built-in voltage supply monitor and SCL 2 8 Integrated ambient light sensor QFN-10 power-on reset controller 100 mlx resolution possible, V V 3 7 DD DD 2 allowing operation under dark I C Serial communications V INT 4 6 DD glass 5 Up to 3.4 Mbps data rate 1 to 128 klx dynamic range Slave mode hardware address DNC possible across two ADC range decoding settings Small-outline 10-lead 2x2 mm Accurate lux measurements with QFN IR correction algorithm Temperature Range 40 to +85 C Applications Fitness/health electronics Tablets Smart watches Portable consumer electronics Smartphone handsets Display-backlighting control Description The Si1132 is a low-power, ultraviolet (UV) index, and ambient light 2 sensor with I C 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. Rev. 1.2 12/14 Copyright 2014 by Silicon Laboratories Si1132 Not Recommended for New DesignsSi1132 Functional Block Diagram VDD Regulator Temp A Filter ADC M U Visible X Digital Sequencer & Control Logic Infrared INT SCL Registers Oscillator GND 2 SDA I C 3.3 V Host Si1132 SDA VDD SDA GND SCL SCL VDD VDD VDD INT INT 0.1 uF Figure 1. Si1132 Application 2 Rev. 1.2 Not Recommended for New Designs