16 MHz core, 60 KB flash — the headroom for sensor-fusion and control loops
The MSP430F2491TRGCT runs the MSP430 CPU16 core at 16 MHz, with 60 KB of on-chip flash and 2 KB of RAM — enough program space for a real-time control loop with a moderate data buffer, and the RAM covers stack plus a few hundred sensor readings before needing external memory.
Peripheral set and I/O count — what connects without external glue
48 I/O pins in a 64-VQFN package — the exposed pad under the QFN sinks heat to the PCB copper pour, so the thermal resistance depends on the board layout. On-chip brown-out detect and POR eliminate the need for an external supervisor in most designs — the BOR holds the core in reset until the supply crosses the threshold, then the POR initialises the registers. The internal oscillator means no external crystal for the basic clock, though the UART baud rate accuracy depends on the internal DCO calibration.
Active lifecycle — no LTB clock ticking
The base product number MSP430F2491 carries the same flash and RAM map across the VQFN and TSSOP packages, so a board spin between packages is straightforward if the supply shifts. RoHS3 compliant per the manufacturer's declaration.
Package and board-fit — the 64-VQFN exposed pad
The 0.5 mm pitch demands a 4-layer board for reliable fan-out of the inner rows; a 2-layer board works only if the outer rows carry the critical signals and the inner rows are tied to power or ground. Tape & Reel packaging (TR) is the standard for automated pick-and-place; Cut Tape (CT) is also available for prototype quantities. The MSL rating is not stated in this listing — confirm the floor life before opening the reel if the bake history matters for your line.