原标题：STM32F303VCT6主流混合信号ARM MCU开发方案

　　ST公司的stm32F303xB/STM32F303xC系列是基于高性能ARM® Cortex®-M4 32位RISC核的MCU，工作频率高达72MHz，嵌入了浮点单元(FPU)，存储器保护单元(MPU)和嵌入跟踪宏单元(ETM)，集成了高速嵌入存储器(高达256KB 闪存，高达40KB SRAM)和各种连接到两个APB总线的增强I/O和外设，提供多达四个快速12位ADC(5Msps)，七个比较器，四个运放，以及多达2个DAC通路，一个低功耗RTC，多达五个通用16位计时器，一个通用32位计时器和两个用来马达控制的计时器。工作电压2.0 - 3.6 V，主要用在低功耗应用。本文介绍了STM32F303xB/STM32F303xC系列主要特性，框图，时钟树以及Discovery kit STM32F3DISCOVERY板主要特性，硬件框图，电路图和PCB布局图。

　　The STM32F303xB/STM32F303xC family is based on the high-performance ARM® Cortex®-M4 32-bit RISC core with FPU operating at a frequency of up to 72 MHz， and embedding a floaTIng point unit (FPU)， a memory protecTIon unit (MPU) and an embedded trace macrocell (ETM)。 The family incorporates high-speed embedded memories (up to 256 Kbytes of Flash memory， up to 40 Kbytes of SRAM) and an extensive range of enhanced I/Os and peripherals onnected to two APB buses.

　　The devices offer up to four fast 12-bit ADCs (5 Msps)， seven comparators， four operaTIonal amplifiers， up to two DAC channels， a low-power RTC， up to five general-purpose 16-bit TImers， one general-purpose 32-bit timer， and two timers dedicated to motor control. They also feature standard and advanced communication interfaces： up to two I2Cs， up to three SPIs (two SPIs are with multiplexed full-duplex I2Ss)， three USARTs， up to two UARTs， CAN and USB. To achieve audio class accuracy， the I2S peripherals can be clocked via an external PLL.

　　The STM32F303xB/STM32F303xC family operates in the -40 to +85℃ and -40 to +105℃ temperature ranges from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving mode allows the design of low-power applications.

　　The STM32F303xB/STM32F303xC family offers devices in four packages ranging from 48 pins to 100 pins.The set of included peripherals changes with the device chosen.

　　STM32F303VCT6主要特性：

　　• Core： ARM® Cortex®-M4 32-bit CPU with FPU (72 MHz max)， single-cycle multiplication and HW division， 90 DMIPS (from CCM)， DSP instruction and MPU (memory protection unit)

　　• Operating conditions：

　　– VDD， VDDA voltage range： 2.0 V to 3.6 V

　　• Memories

　　– 128 to 256 Kbytes of Flash memory

　　– Up to 40 Kbytes of SRAM， with HW parity check implemented on the first 16 Kbytes.

　　– Routine booster： 8 Kbytes of SRAM on instruction and data bus， with HW parity check (CCM)

　　• CRC calculation unit

　　• Reset and supply management

　　– Power-on/Power-down reset (POR/PDR)

　　– Programmable voltage detector (PVD)

　　– Low-power modes： Sleep， Stop and Standby

　　– VBAT supply for RTC and backup registers

　　• Clock management

　　– 4 to 32 MHz crystal oscillator

　　– 32 kHz oscillator for RTC with calibration

　　– Internal 8 MHz RC with x 16 PLL option

　　– Internal 40 kHz oscillator

　　• Up to 87 fast I/Os

　　– All mappable on external interrupt vectors

　　– Several 5 V-tolerant

　　• Interconnect matrix

　　• 12-channel DMA controller

　　• Four ADCs 0.20 μS (up to 39 channels) with selectable resolution of 12/10/8/6 bits， 0 to 3.6 V conversion range， single ended/differential input， separate analog supply from 2 to 3.6 V

　　• Two 12-bit DAC channels with analog supply from 2.4 to 3.6 V

　　• Seven fast rail-to-rail analog comparators with analog supply from 2 to 3.6 V

　　• Four operational amplifiers that can be used in PGA mode， all terminals accessible with analog supply from 2.4 to 3.6 V

　　• Up to 24 capacitive sensing channels supporting touchkey， linear and rotary touch sensors

　　• Up to 13 timers

　　– One 32-bit timer and two 16-bit timers with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input

　　– Two 16-bit 6-channel advanced-control timers， with up to 6 PWM channels， deadtime generation and emergency stop

　　– One 16-bit timer with 2 IC/OCs， 1 OCN/PWM， deadtime generation and emergency stop – Two 16-bit timers with IC/OC/OCN/PWM， deadtime generation and emergency stop

　　– Two watchdog timers (independent， window)

　　– SysTick timer： 24-bit downcounter

　　– Two 16-bit basic timers to drive the DAC

　　• Calendar RTC with Alarm， periodic wakeup from Stop/Standby

　　• Communication interfaces

　　– CAN interface (2.0B Active)

　　– Two I2C Fast mode plus (1 Mbit/s) with 20 mA current sink， SMBus/PMBus， wakeup from STOP

　　– Up to five USART/UARTs (ISO 7816 interface， LIN， IrDA， modem control)

　　– Up to three SPIs， two with multiplexed half/full duplex I2S interface， 4 to 16 programmable bit frames

　　– USB 2.0 full speed interface

　　– Infrared transmitter

　　• Serial wire debug， Cortex®-M4 with FPU ETM， JTAG

　　• 96-bit unique ID

　　图1.STM32F303xB/STM32F303xC框图

　　图2.STM32F303xB/STM32F303xC时钟树

　　STM32F303VC MCUDiscovery kitSTM32F3DISCOVERY

　　The STM32F3DISCOVERY Discovery kit is a complete demonstration and development platform for STMicroelectronics Arm® Cortex®-M4 core-based STM32F303VCT6 microcontroller. It includes an ST-LINK/V2 (or V2-B) embedded debug tool interface， an ST MEMS gyroscope， an ST MEMS E-compass， LEDs， push-buttons， and a USB Mini-B connector.

　　图3.Discovery kit STM32F3DISCOVERY外形图

　　Discovery kit STM32F3DISCOVERY板主要特性：

　　• STM32F303VCT6 Arm®(a)-based microcontroller featuring 256 Kbytes of Flash memory， 48 Kbytes of RAM in an LQFP100 package

　　• On-board ST-LINK/V2 for PCB Version A or B or ST-LINK/V2-B for PCB Version C and newer

　　• USB ST-LINK functions：

　　– Debug port

　　– Virtual COM port with ST-LINK/V2-B only

　　– Mass storage with ST-LINK/V2-B only

　　• Board power supply： through the USB bus or from an external 3 V or 5 V supply voltage

　　• External application power supply： 3 V and 5 V

　　• L3GD20， ST MEMS motion sensor， 3-axis digital output gyroscope

　　• LSM303DLHC， ST MEMS system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor

　　• Ten LEDs：

　　– LD1 (red) for 3.3 V power-on.

　　– LD2 (red/green) for USB communication.

　　– Eight user LEDs， LD3/10 (red)， LD4/9 (blue)， LD5/8 (orange) and LD6/7 (green)。

　　• Two push buttons (user and reset)

　　• USB USER with Mini-B connector

　　• Extension header for LQFP100 I/Os for quick connection to prototyping board and easy probing

　　• Comprehensive free software including a variety of examples， part of STM32CubeF3 package or STSW-STM32118 for legacy Standard Library usage

　　图4.Discovery kit STM32F3DISCOVERY硬件框图

　　图5.Discovery kit STM32F3DISCOVERY电路图(1)

　　图6.Discovery kit STM32F3DISCOVERY电路图(2)：ST-LINK/V2(仅SWD)

　　图7.Discovery kit STM32F3DISCOVERY电路图(3)：STM32F303VCT6 MCU

　　图8.Discovery kit STM32F3DISCOVERY电路图(4)：外设

　　图9.Discovery kit STM32F3DISCOVERY PCB布局图：顶层

　　图10.Discovery kit STM32F3DISCOVERY PCB布局图：底层

　　图11.Discovery kit STM32F3DISCOVERY PCB尺寸图