80 MHz Cortex-M3 with USB OTG and CAN — what it brings to a control design
It belongs to the Stellaris ARM Cortex-M3S 5000 series, a family aimed at real-time control applications that need a rich peripheral set without an external PHY or transceiver for USB and CAN. The 80 MHz core gives it enough throughput to handle a motor-control FOC loop alongside a CANopen stack and a USB virtual-comport debug channel without stalling. The 67 GPIOs, mapped through a 100-LQFP package, leave headroom for a parallel LCD interface or a bank of isolated digital inputs on the same board.
Connectivity and analog — what the peripheral list covers
The 16-channel 12-bit ADC covers analog feedback from current sensors or thermistors without an external multiplexer. Internal oscillator trims the BOM by one crystal if the application tolerates the ±1% accuracy over temperature.
The LM3S5G51-IQC80-A1T is officially obsolete per Texas Instruments' product status. No last-time-buy window remains open through the factory channel. A buyer filling a BOM line should expect to source from verified inventory lots — date codes may span several years, and the part should be tested for solderability and functional integrity before assembly. There is no pin-compatible direct replacement from TI's current active portfolio; the Stellaris family was superseded by the Tiva C Series, which uses a different register map and requires firmware migration.