ARM9 MCU with USB OTG and CAN — what this part delivers
The NXP LPC2939FBD208,551 is a 16/32-bit ARM9 microcontroller running at 125 MHz, with 768 KB of on-chip Flash, 56 KB of RAM, and 16 KB of EEPROM. The 208-LQFP package (28x28 mm) provides 152 general-purpose I/O, making it suitable for industrial control, motor drive, and communication gateway applications where a single-chip ARM9 core with both USB host/device and CAN is needed.
125 MHz ARM9 — timing and throughput
The 125 MHz core speed positions this part in the mid-range ARM9 tier — enough for protocol bridging, sensor fusion, or HMI control loops, but not for high-rate video or DSP workloads. The 768 KB Flash is sized for moderate firmware images with room for a bootloader and application code; the 56 KB RAM handles typical stack and buffer needs for CAN and USB stacks without external memory, though the EBI/EMI interface allows expansion if needed.
NRND — sourcing reality for this MCU
NXP has designated the LPC2939FBD208,551 as Not Recommended for New Design (NRND). No last-time-buy window is specified in the evidence; procurement teams should evaluate long-term supply risk and consider qualifying a replacement if the design is still in early production.
The 208-LQFP package (28x28 mm) is a standard fine-pitch surface-mount footprint. Verify the moisture sensitivity level on the part label before reflow.