ARM Cortex-M3 core at 72 MHz with 96 KB flash
The CY9BF121KQN-G-AVE2 is a 32-bit single-core ARM Cortex-M3 MCU from Infineon's FM3 MB9B120M series, clocked at 72 MHz. The 96 KB on-chip flash and 16K x 8 SRAM leave headroom for a moderate application stack plus a real-time operating system footprint — the 16 KB RAM is the tighter budget for data-heavy control loops.
Industrial temperature margin and package
Surface-mount assembly on the 0.50 mm pitch QFN demands a solder-paste stencil that matches the exposed-pad aperture; the manufacturer's land pattern recommends a 5.2 x 5.2 mm pad with 0.25 mm via pitch for thermal relief.
Peripheral set for mixed-signal control
Fourteen 12-bit ADC channels and two 10-bit DAC channels let the MCU sample multiple analog sensors and output a control voltage without an external converter — useful for a three-phase current-sense front-end or a valve-positioning loop. The DMA controller moves ADC results to RAM without CPU intervention, keeping the 72 MHz core free for the control algorithm. Serial interfaces include CSIO, I²C, LINbus, and UART/USART — enough for a CAN gateway (via an external transceiver on the UART), an I²C temperature sensor, and a LIN bus for a local actuator network. The PWM timer with dead-time insertion drives a half-bridge FET pair directly.
The FM3 MB9B120M series is a current-production line, so the part is sourced through authorized distribution channels with full manufacturer warranty and lot traceability. ROHS3 compliant per. The 48-QFN package is Pb-free and compatible with standard lead-free reflow profiles (peak 260°C).