What this MCU is and where it fits
The LM3S5D51-IQC80-A1T is a 32-bit ARM Cortex-M3 microcontroller running at 80 MHz, with 512 KB Flash and 96 KB RAM. It operates from -40°C to 85°C.
Connectivity and I/O — USB OTG, CAN, and serial options
This MCU carries USB OTG, CAN, and a full set of serial interfaces: I2C, SPI, SSI, UART/USART, IrDA, LIN, and Microwire. USB OTG support means the chip can act as either a USB host or device — useful for direct connection to thumb drives, keyboards, or sensors without a separate host controller. The 67 general-purpose I/O pins in a 100-LQFP package give enough flexibility for parallel buses, keypads, and display interfaces without resorting to a larger footprint.
Lifecycle reality — EOL status and sourcing
The LM3S5D51-IQC80-A1T is end-of-life (EOL hot). TI has discontinued the part; no new factory orders are accepted. Sourcing is through the independent market; we quote to order against an RFQ.
Key ratings at a glance
Core: ARM Cortex-M3, 32-bit, single-core at 80 MHz. Supply: 3.0 V to 3.6 V. Temperature: -40°C to 85°C. Package: 100-LQFP (14x14 mm), surface mount. Peripherals include brown-out detect, DMA, I2S, POR, PWM, WDT, and a 16-channel 12-bit ADC. Internal oscillator — no external crystal required for basic operation.