What this part is and where it fits
The LM3S5D51-IQC80-A2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris 5000 series, clocked at 80 MHz with 512 KB Flash and 96 KB RAM. It includes a 16-channel 12-bit ADC, USB OTG, CAN, and multiple serial interfaces. The 100-pin LQFP package exposes 67 GPIOs.
80 MHz core — what it means for throughput
The Cortex-M3 core runs at 80 MHz. The 512 KB Flash and 96 KB RAM support a single motor axis with field-oriented control plus a Modbus TCP stack.
Obsolete — sourcing reality
Texas Instruments has marked the LM3S5D51-IQC80-A2 as obsolete. No official successor part number is listed. For this order code, the supply channel is the independent surplus and broker market. We source and quote this part to order against an RFQ.
Peripheral set and deployment context
Peripherals include brown-out detect/reset, DMA, I²S, POR, PWM, and WDT. Connectivity covers CAN, I²C, IrDA, LIN, Microwire, QEI, SPI, SSI, UART/USART, and USB OTG. The 16-channel 12-bit ADC and -40°C to 85°C operating range suit industrial enclosures.