This part is a kind of semiconductor called ADNS-5050.
Function of this product has Optical Mouse Sensor.
Manufacturers : PixArt
Image and pinout :
Some of the text within the PDF file :
Data Sheet ADNS-5050 Optical Mouse Sensor Description The ADNS-5050 is a mainstream, small form factor optical mouse sensor. It is a user-friendly product with many built-in features and optimized for LED-based corded products. The ADNS-5050 is capable of high-speed motion detection – up to 30ips and 8g. In addition, it has an on-chip oscillator and built-in LED driver to minimize external components. Frame rate is also adjusted internally. The ADNS-5050 along with the 5100-001 lens, LED clip and HLMP-EG3E-xxxxx LED form a complete and compact mouse tracking system. There are no moving parts, which mean high reliability and less maintenance for the end user. In addition, precision optical alignment is not required, facilitating high volume assembly. The sensor is programmed via registe [ ... ]