原标题：ST STM32F769NI高性能DSP+ MCU开发方案

　　ST公司的STM32F765xx, STM32F767xx, STM32F768Ax和STM32F769xx系列是基于高性能ARM® Cortex®-M7 32位RISC核的处理器,工作频率216MHz,器件集成高达2MB的闪存,512KB SRAM,16KBTCM RAM和4KB 备份SRAM,多种外设和通信接口,主要用在马达驱动和应用控制,医疗设备,工业应用如PLC,逆变器和电路中断器,打印机和扫描仪,告警系统,视频连接和HVAC,家庭音频设备,移动应用和物联网(IoT)以及可穿戴设备如智能手表.本文介绍了STM32F769NI主要特性和框图,以及评估板STM32F769I-EVAL主要特性,硬件框图,元件布局图和电路图.

　　The STM32F765xx, STM32F767xx, STM32F768Ax and STM32F769xx devices are based on the high-performance ARM® Cortex®-M7 32-bit RISC core operating at up to 216 MHz frequency. The Cortex®-M7 core features a floating point unit (FPU) which supports ARM® double-precision and single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances the application security.

　　The STM32F765xx, STM32F767xx, STM32F768Ax and STM32F769xx devices incorporate high-speed embedded memories with a Flash memory up to 2 Mbytes, 512 Kbytes of SRAM (including 128 Kbytes of Data TCM RAM for critical real-time data), 16 Kbytes of instruction TCM RAM (for critical real-time routines), 4 Kbytes of backup SRAM available in the lowest power modes, and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses, a 32-bit multi-AHB bus matrix and a multi layer AXI interconnect supporting internal and external memories access.

　　All the devices offer three 12-bit ADCs, two DACs, a low-power RTC, twelve general-purpose 16-bit timers including two PWM timers for motor control, two general-purpose 32-bit timers, a true random number generator (RNG). They also feature standard and advanced communication interfaces.

　　• Up to four I2Cs

　　• Six SPIs, three I2Ss in half-duplex mode. To achieve audio class accuracy, the I2S peripherals can be clocked via a dedicated internal audio PLL or via an external clock to allow synchronization.

　　• Four USARTs plus four UARTs

　　• An USB OTG full-speed and a USB OTG high-speed with full-speed capability (with the ULPI)

　　• Three CANs

　　• Two SAI serial audio interfaces

　　• Two SDMMC host interfaces

　　• Ethernet and camera interfaces

　　• LCD-TFT display controller

　　• Chrom-ART Accelerator™

　　• SPDIFRX interface

　　• HDMI-CEC

　　The STM32F765xx, STM32F767xx, STM32F768Ax and STM32F769xx devices operate in the –40 to +105 °C temperature range from a 1.7 to 3.6 V power supply. Dedicated supply inputs for USB (OTG_FS and OTG_HS) and SDMMC2 (clock, command and 4-bit data) are available on all the packages except LQFP100 for a greater power supply choice.

　　The supply voltage can drop to 1.7 V with the use of an external power supply supervisor. A comprehensive set of power-saving mode allows the design of low-power applications.

　　The STM32F765xx, STM32F767xx, STM32F768Ax and STM32F769xx devices offer devices in 10 packages ranging from 100 pins to 216 pins. The set of included peripherals changes with the device chosen.

　　These features make the STM32F765xx, STM32F767xx, STM32F768Ax and STM32F769xx microcontrollers suitable for a wide range of applications:

　　• Motor drive and application control

　　• Medical equipment

　　• Industrial applications: PLC, inverters, circuit breakers

　　• Printers, and scanners

　　• Alarm systems, video intercom, and HVAC

　　• Home audio appliances

　　• Mobile applications, Internet of Things

　　• Wearable devices: smartwatches.

　　STM32F769NI主要特性:

　　• Core: ARM® 32-bit Cortex®-M7 CPU with DPFPU, ART Accelerator™ and L1-cache: 16 Kbytes I/D cache, allowing 0-wait state execution from embedded Flash and external memories, up to 216 MHz, MPU, 462 DMIPS/2.14 DMIPS/MHz (Dhrystone 2.1), and DSP instructions.

　　• Memories

　　– Up to 2 Mbytes of Flash memory organized into two banks allowing read-while-write

　　– SRAM: 512 Kbytes (including 128 Kbytes of data TCM RAM for critical real-time data) + 16 Kbytes of instruction TCM RAM (for critical real-time routines) + 4 Kbytes of backup SRAM

　　– Flexible external memory controller with up to 32-bit data bus: SRAM, PSRAM, SDRAM/LPSDR SDRAM, NOR/NAND memories

　　• Dual mode Quad-SPI

　　• Graphics

　　– Chrom-ART Accelerator™ (DMA2D), graphical hardware accelerator enabling enhanced graphical user interface

　　– Hardware JPEG codec

　　– LCD-TFT controller supporting up to XGA resolution

　　– MIPI® DSI host controller supporting up to 720p 30 Hz resolution

　　• Clock, reset and supply management

　　– 1.7 V to 3.6 V application supply and I/Os

　　– POR, PDR, PVD and BOR

　　– Dedicated USB power

　　– 4-to-26 MHz crystal oscillator

　　– Internal 16 MHz factory-trimmed RC (1% accuracy)

　　– 32 kHz oscillator for RTC with calibration

　　– Internal 32 kHz RC with calibration

　　• Low-power

　　– Sleep, Stop and Standby modes

　　– VBAT supply for RTC, 32×32 bit backup registers + 4 Kbytes backup SRAM

　　• 3×12-bit, 2.4 MSPS ADC: up to 24 channels

　　• Digital filters for sigma delta modulator (DFSDM), 8 channels / 4 filters

　　• 2×12-bit D/A converters

　　• General-purpose DMA: 16-stream DMA controller with FIFOs and burst support

　　• Up to 18 timers: up to thirteen 16-bit (1x low-power 16-bit timer available in Stop mode) and two 32-bit timers, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input. All 15 timers running up to 216 MHz. 2x watchdogs, SysTick timer

　　• Debug mode – SWD & JTAG interfaces – Cortex® -M7 Trace Macrocell™

　　• Up to 168 I/O ports with interrupt capability

　　– Up to 164 fast I/Os up to 108 MHz

　　– Up to 166 5 V-tolerant I/Os

　　• Up to 28 communication interfaces

　　– Up to 4 I2C interfaces (SMBus/PMBus)

　　– Up to 4 USARTs/4 UARTs (12.5 Mbit/s, ISO7816 interface, LIN, IrDA, modem control)

　　– Up to 6 SPIs (up to 54 Mbit/s), 3 with muxed simplex I2S for audio

　　– 2 x SAIs (serial audio interface)

　　– 3 × CANs (2.0B Active) and 2x SDMMCs

　　– SPDIFRX interface

　　– HDMI-CEC

　　– MDIO slave interface

　　• Advanced connectivity

　　– USB 2.0 full-speed device/host/OTG controller with on-chip PHY

　　– USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI

　　– 10/100 Ethernet MAC with dedicated DMA: supports IEEE 1588v2 hardware, MII/RMII

　　• 8- to 14-bit camera interface up to 54 Mbyte/s

　　• True random number generator

　　• CRC calculation unit

　　• RTC: subsecond accuracy, hardware calendar

　　• 96-bit unique ID

　　图1.STM32F765xx, STM32F767xx, STM32F768Ax和STM32F769xx框图

　　评估板STM32F769I-EVAL

　　The STM32F769I-EVAL evaluation board is a complete demonstration and development platform for STMicroelectronics ARM® Cortex®-M7 core-based STM32F769NI microcontrollers. It features the following interfaces: four I2Cs, six SPIs with three multiplexed full-duplex I2S, SDIO, two SAIs, 8-bit to 14-bit digital camera, Ethernet MAC, FMC, Quad-SPI. It also features four USARTs and four UART peripherals, two CANs, three 12-bit ADC converters, two 12-bit DAC channels, internal 512 Kbytes of SRAM + 16 Kbytes of instruction TCM RAM + 4 Kbytes of backup SRAM and 2 Mbytes of Flash memory, USB OTG HS and USB OTG FS peripherals, SWD and JTAG debugging support. This evaluation board can be used as a reference design for user application development but it is not considered as a final application. The full range of hardware features on the board helps the user to evaluate all the peripherals (USB OTG HS, USB OTG FS, Ethernet, motor control, microSD card, USART, audio DAC and ADC, digital microphone, CAN, SRAM, NOR Flash, SDRAM, Quad SPI Flash, 4" DSI LCD with capacitive touch panel etc.) and develop applications. Extension headers make it possible to easily connect a daughterboard for a specific application.The integrated ST-LINK/V2-1 provides an embedded in-circuit debugger and programmer for the STM32.

　　图2.评估板STM32F769I-EVAL外形图

　　评估板STM32F769I-EVAL主要特性:

　　• STM32F769I-EVAL microcontroller with 2 Mbytes of Flash memory and internal 512 Kbytes of SRAM + 16 Kbytes of instruction TCM RAM + 4 Kbytes of backup SRAM in BGA216 package

　　• Six 5 V power supply options:

　　– Power jack

　　– ST-LINK/V2-1 Micro-B USB connector

　　– User USB HS connector

　　– User USB FS1 connector

　　– User USB FS2 connector

　　– Daughterboard

　　• SAI interface audio codec, stereo audio jack which supports headset with microphone

　　• 2 stereo digital microphones, audio jack connector used to connect external speakers

　　• 4-Gbyte (or more) SDIO interface microSD card

　　• I2C Extension interface

　　• RS-232 connector

　　• JTAG/SWD and ETM trace debug support, ST-LINK/V2-1 embedded

　　• IEEE-802.3-2002 compliant Ethernet connector

　　• Camera module

　　• 8Mx32bit SDRAM, 1Mx16bit SRAM and 8Mx16bit NOR Flash

　　• 512-Mbit Quad-SPI NOR Flash

　　• 4" capacitive touch LCD display with MIPI® DSI connector

　　• Joystick with 4-direction control and selector

　　• Reset, Wake Up/Tamper or key button

　　• 4-color user LEDs

　　• Extension and memory connectors for daughterboard or wrapping board

　　• USB OTG HS and FS with Micro-AB connectors

　　• RTC with backup battery

　　• CAN2.0A/B compliant connector

　　• Potentiometer

　　• Motor control connector

　　图3.评估板STM32F769I-EVAL硬件框图