What this part is and where it fits
The Texas Instruments LM3S1D21-IQC80-A1T is a 32-bit ARM Cortex-M3 MCU from the Stellaris series, running at 80 MHz. It packs 512 KB of Flash program memory and 96K x 8 of RAM, with 67 general-purpose I/O lines. The part is housed in a 100-LQFP package (14x14 mm) and rated for industrial temperature from -40°C to 85°C. Typical applications include industrial control, motor drives, building automation, and sensor hubs where a mid-range Cortex-M3 core with rich connectivity is needed.
Connectivity and peripherals
This MCU includes a rich set of serial interfaces: I²C, SPI, SSI, UART/USART, IrDA, LIN, and Microwire. It also has an external bus interface (EBI/EMI) for memory expansion, plus DMA, PWM, watchdog timer, brown-out detect, and POR. An internal oscillator keeps the BOM simple. The 8-channel 12-bit ADC covers analog inputs without an external converter.
Industrial temperature range
Rated -40°C to 85°C. The 1.235 V to 1.365 V core supply requires a dedicated rail.
Lifecycle and sourcing reality
This part is obsolete per the manufacturer. No direct pin-compatible replacement is listed in the evidence. For BOM continuity, the part is sourced through independent distribution channels — quoted to order against an RFQ.