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Maxim Integrated


Maxim Integrated MAX32670 Ultra-Low Power Microcontroller

High Reliability MCU Powered by Arm Cortex M4 Processor with FPU for Industrial and IoT Applications

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

The Maxim Integrated MAX32670 is an ultra-low power, cost-effective, high reliability 32-bit microcontroller enabling designs with complex sensor processing without compromising battery life. The MAX32670 combines a flexible and versatile power management unit with the powerful Arm® Cortex®-M4 processor, including the floating point unit (FPU). This 32-bit MCU also offers an easy and cost optimal upgrade path from 8- or 16-bit microcontrollers that use legacy designs.

The MAX32670 device integrates up to 384KB of flash and 160KB of SRAM to accommodate application and sensor code. The microcontroller includes error correction coding (ECC), capable of single error correction and double error detection (SEC-DED), which is implemented over the entire flash, RAM, and cache to ensure ultra-reliable code execution for demanding applications.

Additional features include the two windowed watchdog timers with fully flexible and independent clocking to further enhance reliable operation. In addition, brownout detection ensures proper operation during power-down and power-up events and unexpected supply transients.

The MAX32670 features multiple high-speed peripherals such as 3.4MHz I²C, 50MHz SPI, and 4MBAUD UARTs are included to maximize communication bandwidth. In addition, a low-power UART is available for operation in the lowest power sleep modes to facilitate wakeup on activity without any loss of data. A total of six timers with I/O capability are provided, including two low-power timers to enable pulse counting, capture/compare and PWM generation even in the lowest power sleep modes. The device packs all this capability in tiny form factors: 5mm x 5mm 40-pin TQFN-EP and 1.7mm x 2.2mm 24-bump WLP packages.

MAX32670 Key Features

  • High-Efficiency Microcontroller for Low Power, High Reliability Devices
    • Arm Cortex-M4 Core with FPU Up to 100MHz
    • 384KB Flash Memory with Error Correction
    • 160KB SRAM (128KB with ECC Enabled), Optionally Preserved in Lowest Power Modes
    • 16KB Unified Cache with ECC
    • UART Bootloader
    • Dual or Single-Supply Operation
      • Ultra-Low 0.9–1.1V VCORE Supply Voltage
      • Internal LDO Operation from Single Supply 1.7V to 3.6V
    • Wide Operating Temperature: -40°C to +105°C
  • Flexible Clocking Schemes
    • Internal High Speed 100MHz Oscillator
    • Internal Low Power 7.3728MHz and Ultra-Low Power 80kHz Oscillators
    • 14MHz to 32MHz Oscillator (External Crystal Required)
    • 32.768kHz Oscillator (External Crystal Required)
    • External Clock Input for the Core
    • External Clock Input for the LPUART and LPTMR


  • Power Management Maximizes Uptime for Battery Applications
    • 44µA/MHz Active at 0.9V Up to 12MHz
    • 50µA/MHz Active at 1.1V Up to 100MHz
    • 2.6µA Full Memory Retention Power in Backup Mode at VDD = 1.8V
    • 350nA Ultra-Low Power RTC at VDD = 1.8V
    • Wake from LPUART or LPTMR
  • Optimal Peripheral Mix Provides Platform Scalability
    • Up to 31 General-Purpose I/O Pins
    • Up to Three SPI Master/Slave (Up to 50MHz)
    • Up to Three 4-Wire UART (Up to 4MBAUD)
    • One Low Power UART (LPUART)
    • Up to Three I²C Master/Slave 3.4Mbps High Speed
    • Eight-Channel Standard DMA Controller
    • Up to Four 32-Bit Timers (TMR)
    • Up to Two Low Power 32-Bit Timers (LPTMR)
    • Two Windowed Watchdog Timers
    • One I²S Slave for Digital Audio Interface
  • Security and Integrity
    • Available Secure Boot
    • AES 128/192/256 Hardware Acceleration Engine
    • TRNG Compliant to SP800-90B
    • 32-Bit CRC Acceleration Engine

MAX32670 Applications/Uses

  • Algorithm Coprocessor
  • Battery-Powered Medical Devices
  • Industrial Sensors
  • Optical Communication Modules
  • Secure Radio Modem Controller
  • Smart Sensor Controller
  • System Housekeeping Controller


MAX32670 Simplified Block Diagram

Maxim Integrated MAX32670 Microcontroller Block Diagram


See the all 32 bit Microcontrollers by Maxim Integrated