This part is a kind of semiconductor called Si1145.

Function of this product has PROXIMITY/UV/AMBIENT LIGHT SENSOR IC.

Manufacturers : Silicon Laboratories

Image and pinout :

Some of the text within the PDF file :

Si1145/46/47 PROXIMITY/UV/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE Features  Integrated infrared proximity detector  Integrated UV index sensor Proximity detection adjustable from  Industry's lowest power consumption under 1 cm to over 50 cm 1.71 to 3.6 V supply voltage Three independent LED drivers 9 µA average current (LED pulsed 15 current settings from 5.6 mA to 25.6 µs every 800 ms at 180 mA 360 mA for each LED driver plus 3 µA Si114x supply) 25.6 µs LED driver pulse width < 500 nA standby current 50 cm proximity range with single Internal and external wake support pulse (<3 klx) Built-in voltage supply monitor and 15 cm proximity range with single power-on reset controller pulse (>3 [ ... ]

Si1145 PDF Datasheet Download