20 MHz CPU, 256 KB flash, 18 KB RAM — BOM-fit check
The MSP430F6632IZQWR: The 16-bit MSP430 CPUXV2 core runs at 20 MHz — the throughput ceiling for real-time control loops and protocol handling is set by the flash wait-state profile at this clock. 256 KB of on-chip flash and 18 KB of RAM leave room for a USB stack, RTOS kernel, and application code without external memory — the 18 KB RAM must cover the stack, heap, and data buffers for the active peripherals.
USB + serial connectivity in a 113-ball BGA
Connectivity includes USB, I²C, SPI, UART, and IrDA — the USB peripheral handles device-side communication without an external PHY, saving board space. The 113-VFBGA (BGA Microstar Junior, 7x7 mm) delivers 74 I/Os in a compact footprint — the 0.50 mm ball pitch demands a 4-layer PCB for fan-out and a controlled-impedance stack-up for the USB differential pair.