25 MHz core, USB 2.0 on-chip — the BOM-fit decision
The MSP430F5500IRGZR: Integrated USB 2.0 PHY (full-speed, 12 Mbps) with the I²C, SPI, and UART serial interfaces means this single chip bridges a USB host to a peripheral bus — no external USB-to-UART bridge needed.
Industrial temperature and package reality for the layout
31 general-purpose I/O lines are available, with on-chip brown-out detect, POR, DMA, and PWM peripherals — the DMA engine moves ADC results to RAM without CPU cycles, leaving the core free for protocol handling.
Active lifecycle — no last-time-buy clock ticking
The base product number MSP430F5500 covers the family; this specific IRGZR suffix denotes the 48-VQFN package with tape-and-reel or cut-tape delivery.