50 MHz Cortex-M3 with 128 KB Flash
The LM3S2651-IBZ50-A2T: The 128 KB on-chip Flash and 32 KB SRAM provide enough headroom for a moderate-complexity firmware stack — think a CANopen node with a sensor interface and a local control loop, where the 32 KB RAM leaves room for a real-time OS heap and communication buffers.
Connectivity and peripheral set
The MCU integrates CANbus, I²C, SPI, SSI, UART/USART, and IrDA — covering the common industrial fieldbus and sensor interfaces. The 53 GPIOs can drive a parallel LCD or multiple chip selects without external port expanders. A 4-channel 10-bit ADC handles basic analog inputs like potentiometer feedback or temperature sensor conditioning. The internal oscillator eliminates the external crystal for many applications, though the accuracy may not suit precision timing.
Housed in a 108-ball LFBGA (10x10 mm), the LM3S2651-IBZ50-A2T requires a multi-layer PCB for fan-out — the 0.80 mm ball pitch is manageable with standard 4-layer stack-ups. Tape-and-reel packaging supports automated assembly.