Cortex-M3 core at 40 MHz — flash and RAM budget
The CY9AF421LWQN-G-JNE2: The ARM Cortex-M3 core runs at 40 MHz, delivering a deterministic interrupt latency that suits real-time control loops. The 64 KB of on-chip flash (64K x 8) and 8K x 8 SRAM set the firmware footprint ceiling — a full CANopen stack plus a modest application layer fits, but leave headroom for the bootloader and any field-update staging buffer. The internal oscillator means no external crystal is required for the core clock, saving two pins and a PCB component. The LVD, POR, and WDT peripherals handle brown-out and watchdog supervision without an external supervisor IC.
ROHS3 compliance is confirmed on the lifecycle record, so the part passes EU material restrictions without additional documentation.
Connectivity and analog I/O
The CANbus interface, along with I²C, LINbus, CSIO, and UART/USART, makes this MCU a natural fit for industrial fieldbus nodes and sensor hubs. The 8-channel 12-bit ADC and single 10-bit DAC handle analog sensor conditioning and simple analog output without an external converter. 51 general-purpose I/O pins are available in the 64-QFN package (9x9 mm, exposed pad).