Design-in fit for an industrial Cortex-M3 controller
The LM3S1D21-IBZ80-A1T is a Stellaris ARM Cortex-M3 MCU from Texas Instruments, clocked at 80 MHz with a 32-bit single-core processor. It carries 512 KB of Flash and 96 KB of SRAM — enough headroom for a control loop with a moderate protocol stack, such as a motor drive running field-oriented control plus an EtherCAT slave. The 67 GPIOs and a connectivity set that includes EBI/EMI, I²C, SPI, SSI, UART/USART, CAN-style LINbus, IrDA, and Microwire mean it can bridge between a parallel LCD, a serial EEPROM, and a fieldbus transceiver without external glue logic.
Memory and peripheral budget for the BOM line
The 8-channel 12-bit ADC (A/D 8x12b) handles analog inputs like current-sense resistors or thermistor feedback directly, reducing the BOM count for external converters. Peripherals include brown-out detect, POR, DMA, PWM, and a watchdog timer — the PWM channels can drive a 3-phase inverter bridge, while the DMA offloads the Cortex-M3 core during high-speed UART or SPI transfers.
Obsolete — sourcing path for production support
Texas Instruments lists the LM3S1D21-IBZ80-A1T as obsolete. For existing BOM lines that require this exact part number, supply runs through independent distribution channels — quantities are lot-specific and confirmed at RFQ.
Package and temperature grade for the deployment environment
Housed in a 108-ball BGA (108-LFBGA, supplier device package 108-BGA 10x10 mm), this MCU requires a multi-layer PCB for fan-out — the 0.80 mm ball pitch is manageable with a 4-layer board using via-in-pad or dog-bone breakout.