This part is a kind of semiconductor called ATSAMC21G15A.

Function of this product has SMART ARM-Based Microcontrollers.

Manufacturers : Atmel

Image and pinout :

Some of the text within the PDF file :

SMART ARM-Based Microcontrollers SAM C21E / SAM C21G / SAM C21J DATASHEET PRELIMINARY Introduction The Atmel® | SMART™ SAM C21 is a series of microcontrollers optimized for industrial automation, appliances and other 5V applications using the 32-bit ARM® Cortex®-M0+ processor, ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM and operate at a maximum frequency of 48MHz and reach 2.46 CoreMark®/MHz. The SAM C21 devices are designed for simple and intuitive migration with identical peripheral modules, hex compatible code, identical linear address map and pin compatible migration paths between all devices in the product series. All devices include intelligent and flexible peripherals, Atmel Event System for inter-peripheral signaling, and support for capacitive touch b [ ... ]

ATSAMC21G15A PDF Datasheet Download