Texas Instruments has marked the LM3S1133-IQC50-A2 as Obsolete. This part is a 32-bit single-core microcontroller from the Stellaris ARM Cortex-M3S 1000 series, running the Cortex-M3 core at 50 MHz. The 64 KB on-chip Flash and 16 KB SRAM define the firmware and data buffer budget — sufficient for control loops, sensor fusion, and communication stacks that fit within that footprint.
50 MHz Cortex-M3 with 44 I/O and 2x10-bit ADC
The 50 MHz core clock delivers the throughput for real-time control tasks — PWM generation, UART polling, and ADC sampling — without external timing components, thanks to the internal oscillator. The 44 general-purpose I/O lines provide enough pins for a mid-complexity control board: keypad scanning, LED driving, and parallel LCD interface alongside the serial peripherals. Connectivity options include I²C, SPI, SSI, UART/USART, IrDA, and Microwire — covering the common fieldbus and sensor interfaces in industrial automation, building control, and test equipment. The two 10-bit analog-to-digital converters allow simultaneous sampling of two analog channels, such as a potentiometer feedback and a temperature sensor, without an external mux. On-chip brown-out detect and POR ensure the core resets cleanly when the supply dips below the threshold, eliminating the need for an external supervisor IC in many designs.
Industrial temperature grade and 100-LQFP footprint
The 100-pin LQFP package with a 14x14 mm body requires a 4-layer PCB for full fan-out of the 0.50 mm pitch leads; a 2-layer board will only break out the outer rows, limiting signal access.