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Nuvoton Technology Introduces NuMicro® M251/M252 Series Microcontroller - A Low Power 5V Microcontroller Based on Arm® Cortex®-M23 Core

Hsinchu, Taiwan - 2020/09/18 - Nuvoton Technology Corporation, a leading microcontroller platform solution provider, launches a new low power, industrial grade NuMicro®M251/M252 Series designed for industrial control applications. It is based on Arm® Cortex®-M23 secure core for Armv8-M architecture, running up to 48 MHz with up to 256 KB Flash and 32 KB SRAM. The power consumption in the deep power-down mode is down to 2.0 μA; NuMicro M251/M252 Series provides five kinds of power modes and three types of secure protect mechanisms to satisfy the sensor node devices, which cares power consumption in IIoT applications.

The wide supply voltage ranges from 1.8V to 5.5V, and operating temperature ranges from -40℃ to 105℃; NuMicro M251/M252 Series provides rich package types from 20-pin to 128-pin, and five power modes for different operating scenarios. Integrating RTC with independent VBAT to support low power mode, low power ΜART supports transmission rates up to 9600 bps in power-down mode to make power management much more efficient in battery-powered devices. NuMicro M251/252 Series provides 138 μA/MHz in normal run mode. The power-down mode current with RTC is down to 2.5μA, and the Deep power-down current is less than 1.4 μA.

NuMicro® M251/ M252 Series supports powerful and rich peripherals, such as Programmable Serial I/O (PSIO), up to six pins of Voltage Adjustable Interface (VAI), External Bus Interface (EBI), Universal Serial Control Interface (USCI), QSPI, SPI/I²S, I2C, Smart Card Interface (ISO-7816-3), Watchdog timer, RTC, and up to 24 channels of PWM. Those peripherals make it highly suitable for connecting comprehensive external modules. For high-performance analog features, it integrates up to a 16-channel 12-bit 880 kSPS SAR ADC to sample the sensor data without delay, one Operational Amplifier (OPA) to amplify small signal for motor control, built-in five levels of internal voltage reference to provide precise voltage to ADC and ACMP, one 12-bit 1 MSPS voltage type DAC, and two rail-to-rail analog comparator (ACMP) to enhance product competitivity and reduce both external components and form factor.

NuMicro® M251/ M252 Series provides up to eight channels of Nuvoton Patented Programmable Serial I/O (PSIO), accompany with PDMA hardware could realize several proprietary serial interfaces, such as DMX512, HDQ, 1-wire, Microwire, and programmable encoder, no matter the standard interface or proprietary interface can be realized by PSIO interface, which can not only adding the feasibility of proprietary interface but also shorten the complexity of program but to ease the loading from CPU.

To protect customer’s intellectual property, NuMicro M251/M252 Series provides several mechanisms, by using flash lock bit can prevent the program from being read out by an external programmer, built-in one eXecute-Only-Memory (XOM) region and four Memory Protection Unit (MPU) to protect critical codes, and one Tamper detection pin to detect the state transition status. NuMicro M251/M252 Series also equipped with 96-bit UID (Unique Identification) and 128-bit UCID (Unique Customer Identification).  Besides, Nuvoton provides a safety library that can be compliant with the IEC-60730 requirement for Class B safety function to raise safety function for customers’ end products.

Moreover, Nu-Link and Nu-Link-2-Pro debuggers are available for evaluation and product development. Third-Party IDEs such as Keil MDK, IAR EWARM, and NuEclipse IDE with GNU GCC compilers are also supported. The latest NuTool-Code-Generator is available to generate the initial program automatically.

More details of the NuMicro M251/ M252 Series:


About Nuvoton Technology

Nuvoton Technology Corporation (NTC) was founded to bring innovative semiconductor solutions to the market. NTC was spun-off as a Winbond Electronics affiliate in July 2008 and went public in September 2010 on the Taiwan Stock Exchange (TSE). Nuvoton Technology focuses on the developments of microcontroller, microprocessor, smart home and cloud security IC and has strong market share in Industrial, Consumer and Computer markets. Nuvoton owns a wafer fab, featuring customized processes for analog and power products. Besides in-house IC products, the wafer fab also provides part of its capacity for foundry services. Nuvoton Technology provides products with a high performance/cost ratio for its customers by leveraging flexible technology, advanced design capability, and integration of digital and analog technologies. Nuvoton values long term relationships with its partners and customers and is dedicated to continuous innovation of its products, processes, and services. The company has established subsidiaries in the USA, China, Israel, India, Singapore, Korea and Japan to strengthen regional customer support and global management. For more information, please visit


Product Contact

Ryan Huang

Director of Microcontroller Marketing Div.

Nuvoton Technology Corporation


Tel: +886-3-5770066 ext. 38024


News Contact

Carol Chang

Nuvoton Technology Corporation


Tel: +886-3-5770066 ext. 23123

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