Obsolete — sourcing the MSP430F5217IZQE
Texas Instruments has marked the MSP430F5217IZQE as Obsolete.
Core and memory — what the 25 MHz and 64 KB mean for fit
The MSP430 CPUXV2 core runs at 25 MHz — this is the clock ceiling for the device. With 64 KB of on-chip FLASH and 8 KB of SRAM, the part fits control applications that need moderate code space and a real-time stack: sensor fusion, motor commutation loops, or communication protocol handling where the 8 KB RAM holds a few buffers plus the stack without external memory. The internal oscillator eliminates an external crystal for many applications, saving two pins and a PCB cost.
31 digital I/O lines are brought out of the 80-ball BGA. The package is a 5×5 mm MICROSTAR JUNIOR BGA — the 0.50 mm ball pitch demands a PCB with at least four layers for fan-out; two-layer boards will struggle to route the inner balls. The connectivity block includes I²C, SPI, UART/USART, and IrDA, so a single MCU can handle a sensor bus, a display link, and a serial debug interface without external level shifters. On-chip peripherals include brown-out detect/reset, DMA, POR, PWM, and a watchdog timer — the brown-out circuit protects FLASH integrity during power ramps, and the DMA engine moves data between peripherals and RAM without CPU intervention, freeing the 25 MHz core for control math.