ATMEGA32U4-AUR Family Name, Microchip ATMEGA32U4-AUR, 8bit AVR Microcontroller, ATmega, 16MHz, 32 kB Flash, 44-Pin TQFP

The low-power Microchip 8-bit AVR RISC-based microcontroller featuring 32KB self-programming flash program memory, 2.5KB SRAM, 1KB EEPROM, USB 2.0 full-speed/low speed device, 12-channel 10-bit A/D-converter, and JTAG interface for on-chip-debug. The device achieves up to 16 MIPS throughput at 16 MHz. 2.7 - 5.5 Volt operation.
USB 2.0 Full-speed/Low Speed Device Module with Interrupt on Transfer CompletionSupports data transfer rates up to 12Mbit/s and 1.5Mbit/sEndpoint 0 for Control Transfers: up to 64-bytesSix Programmable Endpoints with IN or Out Directions and with Bulk, Interrupt or Isochronous TransfersConfigurable Endpoints size up to 256 bytes in double bank modeFully independent 832 bytes USB DPRAM for endpoint memory allocationSuspend/Resume InterruptsCPU Reset possible on USB Bus Reset detection48MHz from PLL for Full-speed Bus OperationUSB Bus Connection/Disconnection on Microcontroller RequestCrystal-less operation for Low Speed mode