80 MHz Cortex-M3 for control and connectivity
The Texas Instruments LM3S5G31-IQC80-A2T is a Stellaris-series ARM Cortex-M3 MCU clocked at 80 MHz, with 384 KB of Flash and 64 KB of RAM on a 32-bit single-core architecture. It carries 67 GPIOs and a full connectivity set including CANbus, I²C, SPI, SSI, UART, and an external bus interface (EBI/EMI), making it a fit for industrial control nodes, motor drives, and human-machine interface panels that need both fieldbus and local sensor I/O. The 16-channel 12-bit ADC handles analog front-end tasks without an external converter. Supply range is 3.0 V to 3.6 V, and the part is rated for -40°C to 85°C operation — suitable for factory floor and outdoor telecom enclosures.
Obsolete — sourcing reality for this EOL MCU
Memory and peripheral headroom for embedded control
With 384 KB of Flash and 64 KB of RAM, this MCU can host a moderate embedded control application with a real-time OS, communications stack (e.g., CANopen or Modbus over UART), and local data logging. The 67 GPIOs and EBI/EMI allow parallel connection to external memory or a display controller without bit-banging. The 16-channel 12-bit ADC samples at rates adequate for current sensing in motor drives or analog input multiplexing in a PLC slice.
Package and mounting — 100-LQFP footprint
Housed in a 100-LQFP package (14x14 mm body), the LM3S5G31-IQC80-A2T is a surface-mount part intended for reflow assembly. The pitch requires careful PCB layout for the EBI/.