What this Stellaris MCU actually does
Connectivity is this part's strong suit: it integrates CAN, USB OTG, multiple SPI/I²C/UART interfaces, and an external bus interface (EBI/EMI) for parallel peripherals like an LCD controller or an FPGA. That makes it a natural fit for an industrial HMI panel, a motor-drive gateway, or a data-acquisition front-end that talks to both a fieldbus and a host PC. The operating temperature range spans -40°C to 85°C. Supply voltage is 1.08 V to 1.32 V.
80 MHz Cortex-M3 — what the speed buys you
At 80 MHz, this core executes a single-cycle multiply and a two-cycle hardware divide. The DMA controller can move ADC results or UART data without stealing cycles from the CPU.
Obsolete — sourcing reality
The LM3S5B91-IQC80-C3T is officially obsolete (EOL). Texas Instruments has ended production; no last-time-buy window remains open. New units are available only through independent distribution and surplus channels. We source and quote this part to order against an RFQ — availability and current pricing are confirmed at quote time. If your BOM line needs a production-run alternative, the Stellaris family includes pin-compatible siblings with similar memory and peripheral maps; we can help identify the closest fit for a redesign.
Peripheral set for industrial control
The 16-channel 10-bit ADC samples analog inputs from sensors or potentiometers without an external converter. The quadrature encoder interface (QEI) reads incremental encoder pulses directly — useful for motor position feedback. The PWM module with dead-band insertion drives a half-bridge or H-bridge with minimal software overhead. Brown-out detect and power-on reset are built in, so the MCU starts predictably on power-up and resets cleanly on a supply dip.