ARM Cortex-M3 MCU with 128 KB flash and 32 KB SRAM
The LM3S1620-EQC25-A2: It packs 128 KB of on-chip flash for firmware and 32 KB of SRAM for data buffers and stack — enough headroom for moderate control and serial-interface applications without external memory. The 100-LQFP package (14x14 mm body) provides 52 GPIOs for peripheral interfacing.
Serial interfaces include I²C, SPI, SSI, UART/USART, IrDA, and Microwire — covering most sensor, display, and transceiver links common in embedded control. The Quadrature Encoder Interface (QEI) handles motor position feedback directly, saving an external decoder. On-chip peripherals include a brown-out detect and reset circuit, a power-on reset (POR), a PWM module for drive signals, and a watchdog timer (WDT) for system supervision. The core runs from a single 2.25 V to 2.75 V supply rail — a 2.5 V nominal rail with ±10 % tolerance covers the range. The 32-bit Cortex-M3 architecture delivers a deterministic interrupt response suitable for real-time control loops.
Lifecycle — obsolete, sourced to order
Texas Instruments lists the LM3S1620-EQC25-A2 as Obsolete. No official successor or pin-compatible replacement is recorded in the manufacturer's lifecycle documentation.