Si1132 Ultraviolet (UV) Index and Ambient Light Sensor IC

 

Si1132 device is not recommended for new designs. For new designs, please use the Si1133 UV Index and Ambient Light Sensor IC with I2C Interface instead.

 

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.

 

Features

  • Digital UV Index sensor
    • Determine real-time UV sun exposure and cumulative UV sun exposure
  • Ambient light sensor
    • Enables accurate light level monitoring under mixed lighting
    • Automatic backlight control for improved end user visual experience and reduced backlight energy
  • Low-power sensors, signal processer, and ADC enable long battery life
    • As little as 1.2 µA average current with once per second UV Index measurements
    • 1.7 to 3.6 V supply voltage
    • < 500 nA standby current
  • I2C interface for ease of communication with host MCU
  • Tiny 2 mm x 2 mm clear QFN package
  • Operating temperature: – 40 to 85 °C

Si1132 Product Matrix

Devices
Part Number Dev Kit Description Data Sheet UV Index LEDs Gesture/Motion Sensing Ambient Light Sensor Interface Package Type Package Size
UVIrSlider2EK UV Index + Ambient Light Sensor Yes 0 Yes I2C QFN10 2x2 mm
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