The LM3S5K31-IBZ80-C3T: That memory split — 128 KB program space with 24 KB of working RAM — is sized for a single protocol stack plus a moderate application layer, not a full RTOS with multiple heavy stacks. The 67 GPIOs give headroom for a parallel LCD or a bank of sensors alongside the serial interfaces.
Peripheral map — USB, CAN, and the serial mix
Connectivity includes CANbus, I²C, SPI, SSI, UART/USART, IrDA, Microwire, QEI, and USB — a broad set that covers industrial fieldbus bridging (CAN to UART), motor-feedback reading (QEI for encoder position), and a USB device port for configuration or data logging. The 16-channel 10-bit ADC is adequate for monitoring analog sensors or potentiometer feedback, though the 10-bit resolution limits precision below 5 mV on a 5 V reference.
108-ball BGA — board-fit realities
Housed in a 108-LFBGA (10x10 mm body), the 0.80 mm ball pitch demands a 4-layer PCB minimum for fan-out — two-layer boards will not route the inner balls.
Texas Instruments has marked the LM3S5K31-IBZ80-C3T as obsolete. For a BOM line that already carries this order code, the procurement path is last-time-buy inventory or a board-spin to a current-generation Cortex-M4 or M7 part with a different pinout.