80 MHz Cortex-M3 with Ethernet, USB OTG, and CAN — the connected-control MCU
The Texas Instruments LM3S9DN6-IQC80-A1T is a Stellaris ARM Cortex-M3S 9000 series 32-bit microcontroller built around the ARM Cortex-M3 core running at 80 MHz.
The 96 KB SRAM is split across the core memory map, so the Ethernet controller's descriptor rings and packet buffers can be allocated without starving the application heap. For designs that log data or store configuration tables, the Flash endurance and sector-erase granularity (typically 1 KB sectors on this family) matter when planning wear-leveling for frequent updates.
Industrial temperature grade and 100-LQFP package
The 100-pin LQFP (14x14 mm body) gives 72 general-purpose I/O, enough to interface a parallel LCD, an external memory bus (EBI/EMI), and multiple serial peripherals without a CPLD for port expansion. The supply range is a narrow 1.235 V to 1.365 V core — a dedicated 1.3 V rail is required, not a 3.3 V or 1.8 V drop-in. That rail needs its own LDO or switcher; the I/O bank runs at 3.3 V separately.
The LM3S9DN6-IQC80-A1T is officially classified as Obsolete by Texas Instruments. No last-time-buy window remains open through the factory channel. Sourcing this part now runs through independent distribution and the surplus market. No official TI successor order code is listed for this exact configuration.