25 MHz Cortex-M3 with 16 KB flash — what the memory and speed mean for fit
The LM3S300-IGZ25-C2T: The 25 MHz core delivers roughly 25 MIPS of deterministic throughput — enough for sensor polling, simple control loops, or a Modbus RTU node, but the 16 KB flash limits firmware to a single application image without a bootloader partition. The 4K x 8 SRAM (4 KB) leaves about 2.5 KB after the stack and minimal HAL, so data buffering beyond a few hundred bytes needs external memory or a lean state-machine design.
48-VQFN package — rework and board integration
Housed in a 48-VFQFN with an exposed pad (7x7 mm body), the part is a QFN with a thermal pad underneath. The exposed pad needs a solder-paste stencil aperture that covers 50-70% of the pad area — too much paste and the part floats; too little and the thermal path to the board ground plane is weak.
Industrial temperature range and peripheral set
On-chip peripherals include brown-out detect, POR, PWM, and a WDT, plus I²C, SPI, SSI, Microwire, and UART/USART connectivity. The 36 I/O pins are enough for a 16x2 LCD, a keypad matrix, and a few sensor interrupts, but not for a parallel memory bus or a large TFT display without external GPIO expanders.