MAX32675C: Ultra-Low Power Cortex®-M4F MCU for Industrial Use

The Analog Devices MAX32675C is a cutting-edge ultra-low-power mixed-signal microcontroller built around the Arm® Cortex®-M4 processor with a floating-point unit (FPU). Engineered for demanding industrial applications, it is particularly suited for 4mA-to-20mA loop-powered sensors and transmitters. This high-performance MCU integrates 384KB of flash memory (376KB user-accessible) and 160KB of SRAM, enhanced with error correction coding (ECC) across flash, SRAM, and cache to ensure reliable code execution in mission-critical environments.

The MAX32675C supports single-error correction and double-error detection (SEC-DED), making it ideal for precision systems requiring robust error handling. Operating with an active current as low as 2.1mA at 12 MHz, this MCU is optimized for energy-efficient performance in loop-powered industrial setups.

Features of the MAX32675C

Advanced Analog Front-End (AFE)

The integrated analog front-end (AFE) incorporates a low-power HART modem, enabling bidirectional digital communication via current loops for configuration and diagnostics. It features:

• Two 12-channel Δ-Σ ADCs optimized for precise sensor measurements.
• Configurable gain amplifiers with 1x to 128x settings.
• 24-bit resolution with a sampling rate of up to 0.4ksps.
• Outputs that can be converted to single-precision floating-point format.

Additionally, the AFE includes a 12-bit DAC with an internal reference for enhanced analog output capabilities, facilitating seamless integration with industrial sensors.

Processing and Memory

• Arm Cortex-M4 core with FPU, clocked at 12 MHz.
• Flash memory: 384KB total, with 376KB available for user applications.
• SRAM: 160KB, configurable with ECC support.

Low-Power Performance

• Active current (IDD_ACTS) ≤ 2.1mA at 85°C.
• Startup current (IDD_STRT): 1.02mA.
• Backup mode with full memory retention (IDD_FBKUS): 375µA.

Digital Interfaces and Peripherals

• SPI: Up to 2 interfaces.
• I2C: Supports up to 3 interfaces.
• UART: 3 standard UARTs and 1 low-power 4-wire UART (LPUART).
• GPIO: Up to 36 configurable pins.

Timers and Security

• Timers: Four 32-bit timers and two low-power 32-bit timers.
• Security features: AES hardware engine supporting 128/192/256-bit encryption, persistent key storage, CRC acceleration, and a secure UART ROM bootloader.

Industrial Grade Design

• Operating temperature: -40°C to +105°C.
• Robust safety and reliability features, including windowed watchdog timers.

Applications

The MAX32675C MCU is ideal for:

1. 4mA-to-20mA loop-powered sensors and transmitters.
2. Industrial pressure, temperature, flow, and level sensors.
3. Medical sensing solutions for pressure, temperature, and flow monitoring.

Key Advantages

With its advanced AFE, robust ECC-enabled memory, and ultra-low-power performance, the MAX32675C is well-equipped to handle the rigorous demands of industrial and medical sensor applications. Its compact, reliable design and comprehensive set of peripherals make it an excellent choice for developers aiming to create precision systems that prioritize energy efficiency and performance.

By integrating versatile analog and digital functionalities with security-focused features, this MCU addresses the growing need for dependable and low-power industrial automation solutions.