As the global transition toward industrial automation and smart living accelerates, the security and processing efficiency of microcontrollers (MCUs) have become decisive factors for enterprises’ success in the business-to-business market. Nuvoton Technology has announced the launch of its new NuMicro M3331 series 32-bit microcontroller. Powered by the Arm Cortex-M33 core, the M3331 series delivers exceptional performance at operating frequencies of up to 180 MHz and integrates TrustZone technology, providing a robust hardware foundation for industrial control, smart factories, smart buildings, and renewable energy.
The M3331 series is more than just a hardware platform; it is an integrated solution designed to address the challenges customers face when processing complex control algorithms and protecting intellectual property (IP). Featuring the Cortex-M33 core with built-in DSP instruction set and a single-precision floating point unit (FPU), it runs up to 180 MHz. The M3331 series is built with comprehensive security mechanisms. Through hardware-level Secure Boot, it ensures that the system executes only certified and authorised firmware from startup, establishing an immutable root of trust. To protect core IP assets, it features eXecute-Only-Memory (XOM) to safeguard core algorithms and eliminate the risk of code leakage. Additionally, the TrustZone technology partitions a secure execution environment to effectively defend against malicious attacks.
Designed for reliability, the M3331 series supports a wide operating temperature range from -40°C to +105°C and exhibits superior interference resistance (ESD HBM 4 kV / EFT 4.4 kV), significantly reducing the risk of downtime caused by environmental factors. To further enhance system reliability, the 512 KB Flash memory supports Error Correction Code (ECC) for detecting and repairing bit-flip errors. Furthermore, within the 320 KB SRAM, a hardware parity check is provided for the 64 KB core area, achieving true industrial-grade system resilience.
To meet the diverse communication demands of the IoT era, the M3331 series introduces an I3C interface and two CAN FD controllers, greatly increasing data throughput between sensors and control nodes. For high-speed peripherals and mass storage, it includes a built-in USB 2.0 High-Speed OTG controller (with on-chip PHY) and an SDH (Secure Digital Host Controller) interface, delivering exceptional performance for both gaming products requiring low-latency transmission and smart consumer devices needing high-bandwidth storage.
Moreover, the M3331 series features a 12-bit ADC with a sampling rate of up to 4.2 Msps, accurately capturing subtle changes in analogue signals. With up to 48 PWM outputs, it provides precise control solutions for professional photography lighting and stage lighting. Specifically, the series is equipped with ELLSI (Enhanced LED Light Strip Interface) and up to 10 LLSI (LED Light Strip Interface) interfaces, supporting next-generation gaming ARGB LED control protocols. This offloads the CPU and reduces development difficulty, enabling brilliant and fluid dynamic LED effects. The M3331 series offers a variety of package options, from the compact QFN 33 (4×4 mm) to the high-pin-count LQFP 128 (14×14 mm), helping customers optimise their PCB layouts.
To accelerate time-to-market, Nuvoton provides NuMaker-M3333KI and NuMaker-M3334KI evaluation boards, along with full support for mainstream RTOS (FreeRTOS, Zephyr, RT-Thread) and GUI libraries (emWin, LVGL). This ecosystem empowers customers to build stable system solutions rapidly.
The M3331 series consists of two subseries: the M3333 series (without USB 2.0 support) and the M3334 series (with USB 2.0 support).
