20MHz MSP430 CPUXV2 with 192KB Flash and USB
The MSP430F5637IZQWR is a 16-bit microcontroller from the MSP430F5xx series, built around the MSP430 CPUXV2 core running at 20MHz. It packs 192KB of Flash and 18KB of RAM, with an integrated USB 2.0 device controller — enough memory and peripheral mix to handle a medium-complexity embedded application without external storage. On-chip analog includes a 16-channel 12-bit ADC and a 2-channel 12-bit DAC, so sensor conditioning and closed-loop control can stay on a single die. The 74 general-purpose I/O lines provide enough headroom for a parallel LCD bus, keypad matrix, and a handful of external interrupts.
Supply range, temperature grade, and package
Housed in the 113-ball VFBGA Microstar Junior package (7x7mm), the 0.50mm pitch demands a multi-layer PCB for fan-out. The small footprint is a trade-off — you save board area but need a controlled-impedance stack-up to route the USB differential pair cleanly.
Texas Instruments lists the MSP430F5637IZQWR as Obsolete. The part is sourced through independent distribution against an RFQ — quantities are lot-specific and confirmed at quote time. For a BOM that already qualifies this MCU, the procurement risk is manageable: the part is still available on the surplus market, but the window is closing. Any new design should migrate to a current MSP430F5xx or MSP430F6xx variant with a compatible peripheral set.