Ultra-Low-Power Arm Cortex-M4 with FPU-Based Microcontroller (MCU) with 2MB Flash and 512KB SRAM

DARWIN Generation U MCUs Are Perfect for Engineers Who Are Serious About Power and Performance

Please check latest availability status for a specific part variant.


DARWIN is a new breed of low-power microcontrollers built to thrive in the rapidly evolving Internet of Things (IoT). They are smart, with the biggest memories in their class and a massively scalable memory architecture. They run forever, thanks to wearable-grade power technology. They are also tough enough to withstand the most advanced cyberattacks. DARWIN microcontrollers are designed to run any application imaginable—in places where you wouldn’t dream of sending other microcontrollers.

Generation U microcontrollers are perfect for wearables and IoT applications that cannot afford to compromise power or performance. The MAX32630-MAX32632 feature an Arm® Cortex®-M4 with FPU CPU that delivers ultra-low power, high-efficiency signal processing functionality with significantly reduced power consumption and ease of use.

Flexible power modes, an intelligent peripheral management unit (PMU), dynamic clock gating and firmware-controlled power gating optimizes power for the specific application.

Multiple SPI, UART, I2C, 1-Wire® master, and USB interfaces are provided. The four-input, 10-bit ADC with selectable references can monitor external sensors.

The MAX32631/MAX32632 are secure versions of the MAX32630. They provide a trust protection unit (TPU) with encryption and advanced security features. These include a modular arithmetic accelerator (MAA) for fast ECDSA, a true random number generator, and a hardware AES engine. The MAX32632 also provides a secure bootloader for additional security and life-cycle management.

Design Solution: Take a Weight Off Your Chest with a Wrist-Worn ECG Monitor ›

MAX32630 User's Guide

Maxim Low Power ARM Micro Toolchain (Mac)

Maxim Low Power ARM Micro Toolchain (Windows)

Arm® Cortex®-M4 Microcontroller (MCU) with 2MB Flash and 512KB SRAM  Arm® Cortex®-M4 Microcontroller (MCU) with 2MB Flash and 512KB SRAM Enlarge+

Key Features

  • High-Efficiency Microcontroller for Wearable Devices
    • Internal Oscillator Operates Up to 96MHz
    • Low Power 4MHz Oscillator System Clock Option for Always-On Monitoring Applications
    • 2MB Flash Memory
    • 512KB SRAM
    • 8KB Instruction Cache
    • 1.2V Core Supply Voltage
    • 1.8V to 3.3V I/O
    • Optional 3.3V ±5% USB Supply Voltage
  • Power Management Maximizes Uptime for Battery Applications
    • 106µA/MHz Active Current Executing from Cache
    • Wakeup to 96MHz Clock or 4MHz Clock
    • 600nA Low Power Mode (LP0) Current with RTC Enabled
    • 3.5µW Ultra-Low Power Data Retention Sleep Mode (LP1) with Fast 5µs Wakeup to 96MHz
  • Optimal Peripheral Mix Provides Platform Scalability
    • SPIX Execute in Place (XIP) Engine for Memory Expansion with Minimal Footprint
    • Three SPI Masters, One SPI Slave
    • Four UARTs
    • Three I²C Masters, One I²C Slave
    • 1-Wire Master
    • Full-Speed USB 2.0 Engine with Internal Transceiver
    • Sixteen Pulse Train (PWM) Engines
    • Six 32-Bit Timers and 3 Watchdog Timers
    • Up to 66 General-Purpose I/O Pins
    • One 10-Bit Delta-Sigma ADC Operating at 7.8ksps
    • RTC Calibration Output
  • Secure Valuable IP and Data with Robust Internal Hardware Security (MAX32631 and MAX32632 Only)
    • Trust Protection Unit (TPU) Including MAA Supports ECDSA and Modular Arithmetic
    • True Random Number Generator
    • AES-128, -192, -256
    • Secure Bootloader (MAX32632 Only)


  • Fitness Monitors
  • Portable Medical Devices
  • Sensor Hubs
  • Sports Watches
  • Wearable Medical Patches

See parametric specs for Microcontrollers (55)

Part NumberMCU CoreCore Clock Speed
Data ProcessingInternal Flash
Internal SRAM
UARTsSPI BusI2C BusUSBGPIO PinsPWMTimer FeaturesPackage/PinsBudgetary
maxmaxSee Notes
MAX32630 ARM Cortex-M4F9632-bit2000512433 Master, 1 Slave1 x 2.0 FS Device666
Wake Up Timer
Windowed Watchdog
$6.93 @1k
$7.85 @1k
$8.31 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX32631 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

High Reliability, Ultra-Low Power Microcontroller Powered by Arm Cortex M4 Processor with FPU for Industrial and IoT

  • High-Efficiency Microcontroller for Low Power, High Reliability Devices
  • Flexible Clocking Schemes
  • Power Management Maximizes Uptime for Battery Applications

Type ID Title
User Guide 6349 MAX32630 User's Guide
User Guide 6245 Getting Started with Eclipse