Cortex-M3 at 25 MHz — flash and RAM budget for a control loop
The LM3S328-IGZ25-C2: The 28 general-purpose I/O lines break out through a 48-pin VQFN package with an exposed thermal pad (7×7 mm).
Serial connectivity and analog capture
The serial interface set covers I²C, SPI, SSI, Microwire, and UART/USART — enough to talk to a temperature sensor, a small display, or a radio module without external bridge chips. The 8-channel 10-bit ADC samples analog signals from potentiometers, current shunts, or thermistors; the 10-bit resolution gives 1024 counts across the 3.0–3.6 V supply range. On-chip peripherals include brown-out detect, power-on reset, a PWM generator, and a watchdog timer. These reduce the external supervisory IC count — the brown-out detect holds the core in reset if the supply dips below the operating threshold, and the WDT catches firmware hangs without a separate watchdog chip.