Tiny, Ultra-Low-Power Arm Cortex-M4 Processor with FPU-Based Microcontroller (MCU) with 256KB Flash and 96KB 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.


In the DARWIN family, the MAX32660 is an ultra-low-power, cost-effective, highly-integrated 32-bit microcontroller designed for battery-powered devices and wireless sensors. It combines a flexible and versatile power management unit with the powerful Arm® Cortex®-M4 processor with floating point unit (FPU) in the industry’s smallest form factor: 1.6mm x 1.6mm, 16-bump WLP or 4mm x 4mm, 20-pin TQFN-EP, or 3mm x 3mm, 24-pin TQFN-EP.

The MAX32660 enables designs with complex sensor processing without compromising battery life. It also offers legacy designs an easy and cost optimal upgrade path from 8- or 16-bit microcontrollers.

The device supports SPI, UART, and I2C communication while also integrating up to 256KB of flash memory and 96KB of RAM to accommodate application and sensor code. An optional bootloader through I2C, UART, or SPI is available.

OnDemand Webinar: What Can you Do with the World’s Smallest Arm® Cortex® M4 with FPU Microcontroller?

World's Smallest Arm® Cortex®-M4F Microcontroller (MCU) World's Smallest Arm® Cortex®-M4F Microcontroller (MCU) Enlarge+

Key Features

  • High-Efficiency Microcontroller for Wearable Devices
    • Internal Oscillator Operates Up to 96MHz
    • 256KB Flash Memory
    • 96KB SRAM, Optionally Preserved in Lowest Power Backup Mode
    • 16KB Instruction Cache
    • Memory Protection Unit (MPU)
    • Low 1.1V VCORE Supply Voltage
    • 3.6V GPIO Operating Range
    • Internal LDO Provides Operation from Single Supply
    • Wide Operating Temperature: -40°C to +105°C
  • Power Management Maximizes Uptime for Battery Applications
    • 85µA/MHz Active Executing from Flash
    • 2µA Full Memory Retention Power in Backup Mode at VDD = 1.8V
    • 450nA Ultra-Low Power RTC at VDD=1.8V
    • Internal 80kHz Ring Oscillator
  • Optimal Peripheral Mix Provides Platform Scalability
    • Up to 14 General-Purpose I/O Pins
    • Up to Two SPI Master/Slave
    • I2S Master/Slave
    • Up to Two UARTs
    • Up to Two I2C Master/Slave, 3.4Mbps High Speed
    • Four-Channel Standard DMA Controller
    • Three 32-Bit Timers
    • Watchdog Timer
    • CMOS-Level 32.768kHz RTC Output


  • Fitness Monitors
  • Industrial Sensors
  • IoT
  • Optical Modules: QSFP-DD, QSFP, 400G
  • Portable Medical Devices
  • Sports Watches
  • Wearable Medical Patches

See parametric specs for Microcontrollers (55)

Part NumberMCU CoreCore Clock Speed
Data ProcessingInternal Flash
Internal SRAM
UARTsSPI BusI2C BusGPIO PinsPWMTimer FeaturesPackage/PinsBudgetary
maxmaxSee Notes
MAX32660 ARM Cortex-M4F9632-bit25696222 Master/Slave143
Wake Up Timer
$1.04 @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: MAX32660 
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.

Quality Management System >
Environmental Management System >


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