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Nuvoton NuMicro® M251/M252 Microcontrollers

Nuvoton NuMicro® M251/M252 Microcontrollers are a low-power platform based on the Arm® Cortex®-M23 core for Armv8-M architecture. The MCUs operate up to 48MHz with 32Kbytes to 256Kbytes embedded Flash memory, 8Kbytes to 32Kbytes embedded SRAM, and 4Kbytes Flash loader memory (LDROM) for InSystem Programming (ISP). The 32-bit microcontrollers provide a wide supply voltage from 1.75V to 5.5V and an operating temperature range from -40°C to +105°C.

The Nuvoton M251/M252 supplies 28 product varieties. The package types of the M251/M252 series include TSSOP20 (4.4mm x 6.5mm), TSSOP28 (4.4mm x 9.7mm), QFN33 (5mm x 5mm), LQFP48 (7mm x 7mm), LQFP64 (7mm x 7mm), and LQFP128 (14mm x 14mm). Pin-to-pin compatibility in the same package makes optimizing product features and performance effortless.

Chart - Nuvoton NuMicro® M251/M252 Microcontrollers

Features

  • Arm Cortex-M23 processor, running up to 48MHz when VDD = 1.75V to 5.5V
  • Built-in PMSAv8 Memory Protection Unit (MPU)
  • Built-in Nested Vectored Interrupt Controller (NVIC)
  • 32-bit single-cycle hardware multiplier and 32-bit 17-cycle hardware divider
  • 24-bit system tick timer
  • Supports programmable and maskable interrupt
  • Supports low-power sleep mode by WFI and WFE instructions
  • Supports single-cycle I/O access
  • Supports XOM feature with one region
  • Low power mode - idle mode
  • Power-down mode (PD)
    • Fast Wake-up Power-down mode (FWPD)
    • Deep Power-down mode (DPD)
  • USCI, RTC, WDT, I2C, timer, UART, BOD, LVR, POR, GPIO, USBD, tamper, ACMP, debug interface, NMI, and reset pin from power-down mode or fast wake-up power-down mode
  • RTC, wake-up timer, LVR, wake-up pins, tamper, from deep power-down mode
  • Built-in LDO for wide operating voltage from 1.75V to 5.5V
  • 1.5V core power voltage
  • Brown-out detector
    • With seven levels at 4.4V/3.7V/3.0V/2.7V/2.4V/2.0V/1.8V
    • Supports brown-out interrupt and reset option
  • Low-voltage reset - 1.55V threshold voltage levels
  • Supports up to six VAI pins
  • User-configurable 1.65V to 5.5V I/O interface with a dedicated power input (VDDIO)
  • Supports UART0~1, SPI0~1, I2C0~1, USCI2 and SC0 interface
  • Security
    • 96-bit Unique ID (UID)
    • 128-bit Unique Customer ID (UCID)

Applications

  • Smart home / smart home appliance
  • Industrial control / industrial automation
  • Smart city
  • IoT device
  • Security alarm system
  • Electronic payments
  • Communication modules
  • Portable wireless data collector
  • Smart door lock
  • Handheld medical device
  • GPS location tracker
  • Electronic Shelf Labels (ESL)

Block Diagram

Block Diagram - Nuvoton NuMicro® M251/M252 Microcontrollers

Cortex-M23 Block Diagram

Block Diagram - Nuvoton NuMicro® M251/M252 Microcontrollers

Power Distribution Diagram

Application Circuit Diagram - Nuvoton NuMicro® M251/M252 Microcontrollers
Veröffentlichungsdatum: 2025-04-17 | Aktualisiert: 2025-05-06