The STM32F098RCH6: This memory and speed tier fits control-loop firmware, sensor fusion, and communication protocol stacks that do not require a real-time OS or large heap. The 51 general-purpose I/O pins provide enough headroom for a modest sensor array or a small human-machine interface with a parallel LCD. The data converter block integrates a 19-channel 12-bit ADC and two 12-bit DAC channels, covering analog feedback and set-point generation without an external converter.
64-UFBGA (5x5) — footprint and rework considerations
The 64-UFBGA (5x5) package is a fine-pitch ball-grid array with 0.5 mm ball pitch typical for this form factor. Reflow profile must follow the manufacturer's recommendation for lead-free assemblies; rework is possible with a BGA rework station but adds cost compared to QFP packages.