Maxim MAX32650超低功耗高性能MCU穿戴应用开发方案

Maxim公司的MAX32650–MAX32652是超低功耗存储器可升级的微控制器（MCU），集成了具有浮点单元（FPU）的Arm® Cortex®-M4核和3MB以及1MB SRAM，存储器升级有多个存储器扩展接口包括HyperBus™/Xccela™ DDR接口和两个SPIX接口，安全数字接口支持外接高速存储器卡包括SD，SDIO，MMC，SDHC和microSD™。器件具有120MHz高速和40MHz低功耗振荡器，7.3728MHz低功耗振荡器，32.768kHz和RTC时钟，主要用在运动手表，健美监视器，可穿戴医疗贴片，手持医疗设备，工业传感器和物联网（IoT）。本文介绍了MAX32650主要优势和特性，框图，以及评估板MAX32650 EVK优势和特性以及电路图，材料清单。

The MAX32650–MAX32652 are ultra-low power memory-scalable microcontrollers designed specifically for high-performance， battery-powered applications. It is based on an Arm® Cortex®-M4 with a floating point unit （FPU） with 3MB flash and 1MB SRAM. Memory scalability is supported with multiple memory-expansion interfaces， including a HyperBus™/Xccela™ DDR interface and two SPI execute in place （SPIX） interfaces. A secure digital interface supports external high-speed memory cards including SD， SDIO， MMC， SDHC， and microSD™。

Extensive power management features provide fine-grained clock and voltage controls. The system clock can be selected from one of four on-chip oscillators from 8kHz to 120MHz as well as the external 32kHz crystal oscillator.Five low power modes provide configurable clocks， peripheral， and power management schemes. Individual SRAM banks of 32KB， 96KB， or 1024KB （full retention） can be placed in a mode to reduce power consumption while retaining SRAM contents.

A SmartDMA performs complex background processing on data being transferred， from simple arithmetic to multiply/accumulate， while the CPU is off. This dramatically reduces overall power consumption compared to conven­tional DMA solutions.

Multiple serial interfaces， each with dedicated FIFOs， allow communication to external sensors. A 4-input， 10-bit ADC monitors system power supplies. An I2S port supportsbidirectional audio streaming.

The MAX32651 includes a trust protection unit （TPU） to provide advanced security features such as a modular arith­metic accelerator （MAA） for fast ECDSA， an AES engine， TRNG， SHA-256 hash， and secure bootloader. A memory decryption integrity unit （MDIU） provides on-the-fly data decryption （plain or executable） stored in external flash.

The MAX32652 is a high-density， 0.35mm pitch， 140-bump WLP package targeted for tiny form factor products that require high I/O counts.

MAX32650主要优势和特性：

Ultra-Efficient Microcontroller for Battery-Powered Applications120MHz Arm Cortex-M4 with FPU

SmartDMA Provides Background Memory Trans­fers with Programmable Data Processing

120MHz High-Speed and 40MHz Low-Power Oscillators

7.3728MHz Low-Power Oscillators

32.768kHz and RTC Clock （Requires External Crystal）

8kHz Always-On Ultra-Low Power Oscillator

3MB Internal Flash

1MB Internal SRAM

104μW/MHz Executing from Cache at 1.1V

Five Low Power Modes： Active， Sleep， Background，Deep-sleep， and Backup

1.8V and 3.3V I/O with No Level Translators

Scalable Cached External Memory Interfaces:120MB/s HyperBus/Xccela DDR Interface

SPIXF/SPIXR for External Flash/RAM Expansion

240Mbps SDHC/eMMC/SDIO/microSD Interface

Optimal Peripheral Mix Provides Platform Scalability16-Channel DMA

Three SPI Master （60MHz）/Slave （48MHz）

One QuadSPI Master （60MHz）/Slave （48MHz）

Up to Three 4Mbaud UARTs with Flow Control

Two 1MHz I2C Master/Slave

I2S Slave

Four-Channel 7.8ksps 10-Bit Delta-Sigma ADC

USB 2.0 Hi-Speed Device Interface with PHY

16 Pulse Train Generators

Six 32-Bit Timers with 8mA High Drive

1-Wire Master

Trust Protection Unit （TPU） for IP/Data SecurityModular Arithmetic Accelerator （MAA），True Random Number Generator （TRNG）

Secure Nonvolatile Key Storage， SHA-256，AES-128/192/256

Memory Decryption Integrity Unit， Secure Boot ROM

MAX32650应用：

Sports Watches， Fitness Monitors

Wearable Medical Patches， Portable Medical Devices

Industrial Sensors， IoT

图1.MAX32650简化框图

评估板MAX32650 EVK

The MAX32650 EV kit provides a platform for evaluating the capabilities of the MAX32650 ultra-low power memory-scalable microcontroller designed specifically for high per­formance battery powered applications.

评估板MAX32650 EVK优势和特性：

3.5in 320 x 240 Color TFT Display

64MB HyperRAM

64MB XIP Flash

1MB XIP RAM

USB 2.0 Micro B Interface

USB 2.0 Micro B to Serial UARTs Selection with Jumpers Between UART0 and UART2

Micro SD Card Interface

Select GPIOs Accessed through 0.1in Header

Access to the Four Analog Input Through 0.1in Header

Arm® or SWD JTAG 20-Pin Header

On-Board PMIC to Source Power for the MAX32650

Board Power Provided by Either USB Port

Individual Power Measurement on All IC Rails Through Jumpers

On-Board 1.8V and 3.3V Regulators for Peripherals

Two General-Purpose LEDs and Two General- Purpose Pushbutton Switches

评估板MAX32650 EVK包括：

MAX32650 EV kit containing a MAX32650 with a preprogrammed demo

JTAG debugger with ribbon cable

Two standard A to Micro B USB cables

图2.评估板MAX32650 EVK外形图

图3.评估板MAX32650 EVK电路图（1）

图4.评估板MAX32650 EVK电路图（2）

图5.评估板MAX32650 EVK电路图（3）

图6.评估板MAX32650 EVK电路图（4）

图7.评估板MAX32650 EVK电路图（5）

图8.评估板MAX32650 EVK电路图（6）

图9.评估板MAX32650 EVK电路图（7）

评估板MAX32650 EVK材料清单：