Ultra-Low-Power Arm Cortex-M4F with Precision Analog Front-End for Industrial and Medical Sensors

​The MAX32675 is a highly integrated, mixed-signal, ultra-low-power microcontroller for industrial applications and is especially suitable for 4-20mA loop-powered sensors and transmitters. It is based on an ultra-low-power Arm® Cortex®- M4 with Floating Point Unit (FPU) and includes 384KB of flash and 160KB of SRAM. Error correction coding (ECC), capable of single error correction, double error detection (SEC-DED), is implemented over the entire flash, SRAM, and cache to ensure ultra-reliable code execution for demanding applications.

An analog front-end (AFE) provides two 12-channel delta-sigma (Δ-Σ) ADCs with features and specifications optimized for precision sensor measurement. Each Δ-Σ ADC can digitize external analog signals as well as system temperature. A PGA with gains of 1x to 128x precedes each ADC. ADC outputs can be optionally converted on the fly from integer to single-precision floating-point format. A 12-bit DAC is also included.

The device also provides robust security features such as an AES Engine, TRNG, and secure boot.

Applications

* 4-20mA industrial Sensors and Transmitters * Industrial Pressure, Temperature, Flow, and Level Sensors/Transmitters * Medical Pressure, Temperature, and Flow Sensors

* Low-Power, High-Performance for Industrial Applications

* 100MHz Arm Cortex-M4 with FPU * 384KB Internal Flash * 160KB SRAM

* 128kB ECC Enabled

* 44.1μA/MHz ACTIVE Mode at 0.9V up to 12MHz Coremark® * 64.5μA/MHz ACTIVE Mode at 1.1V up to 100MHz Coremark * 2.84μA Full Memory Retention Current in BACKUP Mode at VDDIO = 3.3V * Ultra-Low-Power Analog Peripherals

* Smart Integration Reduces BOM, Cost, and PCB Size

* Two Δ-Σ ADCs

* 12 Channels, Assignable to Either ADC * Flexible Resolution and Sample Rates

* 24 Bits at 0.4ksps * 16 Bits at 4ksps

* 12-Bit DAC * On-Die Temperature Sensor * Digital Peripherals

* SPI (M/S) * Up to Two I2C * Up to Two UARTs * Up to 23 GPIOs

* Timers

* Up to Five 32-Bit Timers * Two Windowed Watchdog Timers

* 8-Channel Standard DMA Controller * One I2S Slave for Digital Audio Interface

* Robust Security and Reliability

* TRNG Compliant to SP800-90B * Secure Nonvolatile Key Storage and AES-128/192/256 * Secure Bootloader to Protect IP/Firmware * Wide, -40°C to +105°C Operating Temperature Range