Nuvoton Technology Corporation, a leading global semiconductor supplier, has introduced the NuMicro M3351 series of 32-bit microcontrollers, featuring an Arm Cortex-M33 core operating at up to 144 MHz and a wide operating voltage range of 2.7 V to 5.5 V. The M3351 series provides a highly integrated 5 V MCU platform for smart appliances, industrial automation, and next generation robotic control.
High-Performance Cortex-M33 Core and Flexible Memory Configuration
The NuMicro M3351 series integrates a comprehensive DSP instruction set and a single-precision floating-point unit (FPU), improving execution efficiency for motor control, real-time signal processing, and complex control algorithms. The series offers 256 KB to 1 MB of Flash memory and up to 128 KB of on-chip SRAM. Devices with up to 1 MB of Flash support Dual-Bank operation, ECC, background operation, and Bank Swap, enabling a more flexible and reliable architecture for firmware-over the-air (FOTA) updates.
Select devices also provide up to 64 KB of independent Data Flash with endurance of up to 100,000 program/erase cycles. During Data Flash programming, the MCU can continue executing code from APROM, reducing the impact of parameter storage on real-time control and communication services. By separating firmware from frequently updated data, the system can more efficiently manage calibration parameters, user settings, fault logs, and operating records while reducing the need to reserve APROM space for EEPROM emulation.
High-Resolution Analog Peripherals and Real-Time Control
The M3351 series integrates a 12-bit SAR ADC with a sampling rate of up to 1.7 MSPS and a 14-bit SAR ADC operating at up to 1.0 MSPS with as many as 16 input channels. It also provides a 12-bit DAC, two analog comparators, up to 24 channels of 16 bit PWM/BPWM, and up to two enhanced quadrature encoder interfaces (EQEI).
Hardware trigger paths among the PWM, ADC, and analog comparator modules reduce CPU workload and improve real-time response, making the M3351 series well suited for closed-loop control applications such as motors, robotic joints, fans, pumps, valves, actuators, and power control systems.
Extensive Connectivity and Hardware-Based Security
The M3351 series provides up to two CAN FD interfaces, 10 UARTs, three I²C interfaces, as well as I3C, QSPI, SPI/I²S, USCI, and USB 2.0 Full-Speed Device/Host connectivity.
To address the growing security requirements of connected equipment, the series incorporates Arm TrustZone technology and Secure Boot with SHA-256 and ECDSA-P256 firmware authentication. Select models further integrate TRNG, PRNG, AES-256, SHA-512, and HMAC-SHA hardware functions to strengthen secure boot, firmware authentication, and data protection.
Industrial-Grade Reliability and Comprehensive Development Support
The M3351 series supports an operating temperature range from -40°C to +105°C and provides robust immunity with ESD HBM protection up to 4 kV and EFT immunity up to 4.4 kV. Its wide 2.7V to 5.5V operating range allows direct operation in common 5V control environments, reducing voltage-conversion requirements and overall system design complexity.
The series is available in package options ranging from the compact QFN33 measuring 5 × 5 mm to the high-pin-count LQFP128 measuring 14 × 14 mm. Nuvoton also provides the NuMaker-M3351KJ development board and Nu-Link debugger, with support for Keil MDK Nuvoton Edition, IAR EWARM, and Visual Studio Code development environments, accelerating product development and deployment across robotics, smart appliances, motor and actuator control, and industrial automation applications.
