180 MHz Cortex-M4 with FPU — the DSP headroom without a separate co-processor
The STM32F446ZCT6: The ARM Cortex-M4 FPU at 180 MHz handles FFT bins, PID coefficients, and sensor-fusion quaternions in hardware rather than soft-emulated math.
Peripheral set and connectivity — what the 114 I/O actually buys you
With 114 I/O lines in a 144-LQFP package, this part can drive a parallel TFT display (EBI/EMI), talk to multiple SPI/I²C sensors, and still leave pins for a CANbus transceiver and USB OTG. The SPDIF-Rx interface is less common on mid-range MCUs — it directly decodes digital audio from an optical or coaxial input without an external decoder chip.
The internal oscillator trims out the external crystal for cost-sensitive builds, but the clock tree still supports an external source when timing accuracy matters.
Package and mounting — 144-LQFP with 20x20 mm body
The 144-LQFP (20x20 mm) is a hand-solderable, inspectable package — no BGA rework station needed.