Texas Instruments has marked the MSP430F6635IZQWR as obsolete.
The MSP430 CPUXV2 core runs at 20 MHz, delivering the throughput for mixed-signal control loops — sensor fusion, data logging, or USB-interfaced instrumentation. The 256 KB flash holds a full application stack plus a bootloader partition; the 18 KB RAM provides working space for data buffers and stack frames without external memory. On-chip peripherals include a 16-channel 12-bit ADC, brown-out detect, DMA, POR, PWM, and a watchdog timer. The connectivity block covers I2C, IrDA, LINbus, SCI, SPI, UART/USART, and USB — a single part handles both serial sensor buses and a USB host/device interface.
113-BGA Microstar Junior — board integration
Packaged in a 113-VFBGA with the supplier device package listed as 113-BGA Microstar Junior (7x7). The 0.50 mm pitch BGA demands a multi-layer PCB with microvia fan-out; the 74 I/O route to the inner rows.