The monolithic Si1132 sensor integrates multiple photodiodes, an analog-to-digital converter, a signal processor and a digital I2C control interface in an impressively small 2 mm x 2 mm clear QFN package. This UV Index and ambient light sensor enables fitness wrist/arm bands, smart watches, and smartphones to differentiate by measuring UV sun exposure. Customers can benefit by receiving a warning of when their current UV exposure is unhealthy or to determine their cumulative UV exposure during exercise. This measurement is critical for people with an elevated risk of sunburn or anyone who is concerned about their sun exposure.
This low-power sensor enables long battery life with standby less than 500 nA and an average power of as little as 1.2 uA with once per second real-time UV Index measurements. An integrated ambient light sensor enables accurate light level monitoring under mixed lighting and automatic backlight control for improved end user visual experience and reduced backlight energy. The Si114x family is supported within the optical sensor software tools