What this Stellaris Cortex-M3 brings to the board
The LM3S2139-IQC25-A2T is a 32-bit ARM Cortex-M3 MCU from the Stellaris 2000 series, clocked at 25 MHz with 64 KB of Flash and 16 KB of RAM. It includes CAN, I²C, SPI, SSI, Microwire, UART, and IrDA connectivity, plus four 10-bit ADC channels and an internal oscillator. The 100-LQFP package provides 56 GPIOs.
25 MHz — what it means for your control loop
At 25 MHz the Cortex-M3 core executes a single-cycle multiply and hardware divide. The 64 KB Flash and 16 KB RAM limit firmware size and TCP/IP stack capacity.
Industrial temperature and supply range
Rated from -40°C to 85°C, the MCU operates on a 2.25 V to 2.75 V supply. Internal POR and brown-out detection reset the core on power-up and during voltage sags.
Lifecycle reality: NRND — plan your next move
The LM3S2139-IQC25-A2T carries NRND status and is flagged as end-of-life hot. For existing production, source through independent distribution via RFQ. For new designs, consider current Stellaris families in the 100-LQFP footprint.