60 MHz AVR32 core — throughput for control and connectivity
The AT32UC3B0128-A2UT is a 32-bit AVR UC3 B microcontroller from Microchip, clocked at 60 MHz. The 128 KB on-chip Flash and 32 KB SRAM cover moderate firmware images.
Peripheral set — DMA, USB, and analog capture
A DMA controller offloads the CPU for block transfers between peripherals and memory, which matters when the USB endpoint is streaming data while the PWM updates a motor phase. The 8-channel 10-bit ADC samples analog inputs — current sense, potentiometer feedback, temperature — at rates that suit slow control loops rather than high-speed acquisition.
Supply range and package — board-level integration
The 64-TQFP package with 0.50 mm pitch demands a 4-layer PCB for clean fan-out of all 44 I/O lines — a two-layer board will struggle to route signals out of the inner rows without vias. The exposed pad (not explicitly stated, but typical for this package) needs a thermal via array under the die to keep junction temperature within limits at 60 MHz continuous operation.
Memory sizing — 128 KB Flash, 32 KB RAM
The 128 KB program Flash and 32 KB SRAM set the application boundary.