The Texas Instruments LM3S808-EQN50-C2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris 800 series, clocked at 50 MHz with 64 KB of Flash program memory and 8 KB of SRAM. It packs 28 general-purpose I/O lines, an 8-channel 10-bit ADC, and serial interfaces covering I²C, SPI, SSI, Microwire, and UART/USART.
The 50 MHz Cortex-M3 core handles a PID loop at 10 kHz with margin for Modbus or serial protocol framing. The 8 KB SRAM limits buffering.
Memory sizing — 64 KB Flash, 8 KB RAM
64 KB of Flash and 8 KB of SRAM are available. Plan the memory map early or budget for external serial RAM over SPI.
The -40 to 105°C operating range qualifies this MCU for factory-floor enclosures and outdoor telecom cabinets. The 48-LQFP package in a 7x7 mm body fits on compact PCBs.
Lifecycle reality — obsolete, no direct replacement
The LM3S808-EQN50-C2 is marked obsolete by Texas Instruments.