ST STM32F7 Series User Manual

February 2017 DocID027559 Rev 5 1/54
1
AN4661
Application note
Getting started with STM32F7 Series MCU hardware development
Introduction
This application note is intended for system designers who require an hardware
implementation overview of the development board, with a focus on the features:
• Power supply,
• Package selection,
• Clock management,
• Reset control,
• Boot mode settings,
• Debug management.
This document describes the minimum hardware resources required to develop an
application based on the STM32F7 Series devices.
Reference documents
The following documents are available on www.st.com:
• Oscillator design guide for STM8S, STM8A and STM32 microcontrollers
application note (AN2867),
• STM32 microcontroller system memory boot mode application note (AN2606).
www.st.com

ST STM32F7 Series Specifications

General

Brand	ST
Model	STM32F7 Series
Category	Microcontrollers
Language	English

Summary

Introduction

Document Purpose

Application note for STM32F7 Series MCU hardware development overview.

Reference Documents

Lists related application notes available on www.st.com.

Power Supplies

Introduction to Power Supplies

Overview of the device's power requirements and supply pins.

Independent A/D Converter Supply

Details on the separate power supply for the ADC for improved accuracy.

Independent USB Transceivers Supply

Requirements for the VDDUSB supply for USB transceivers.

Independent SDMMC2 Supply

Dedicated power supply for SDMMC2 peripherals.

Independent DSI Supply

Power supply for the DSI/MIPI DPHY subsystem.

Battery Backup Domain

Supply for RTC, backup registers, and SRAM when VDD is off.

Voltage Regulator

Describes the internal voltage regulator modes and operation.

Power Supply Scheme

Reset and Power Supply Supervisor

Power-On/Power-Down Reset (PDR)

Integrated circuitry for power-on and power-down reset.

Programmable Voltage Detector (PVD)

Monitors VDD against a programmable threshold.

System Reset

Describes events that trigger a system reset.

Internal Reset ON/OFF

Configuration for internal reset functionality based on PDR_ON pin.

Regulator OFF Mode

Details operation when the internal voltage regulator is disabled.

Regulator and Reset Availability

Table summarizing regulator and reset ON/OFF states per package.

Alternate Function Mapping to Pins

STM32CubeMX for Pin Mapping

Demonstrates using STM32CubeMX for pin mapping exploration.

Clocks

HSE OSC Clock

Configuration of the High-Speed External (HSE) oscillator.

LSE OSC Clock

Configuration of the Low-Speed External (LSE) oscillator.

Clock Security System (CSS)

Monitors HSE clock for failures and switches to HSI.

Boot Configuration

Boot Mode Selection

Selection of boot mode using BOOT pin and option bytes.

System Bootloader Mode

Using the embedded bootloader for Flash reprogramming.

Debug Management

Introduction to Debugging

Overview of host/target interface for debugging.

SWJ Debug Port

Description of the Serial Wire/JTAG Debug Port (SWJ-DP).

SWJ Debug Port Pins

Specific pins used for SWJ-DP functions.

Flexible SWJ-DP Pin Assignment

Options for disabling SWJ-DP ports and releasing pins.

Internal Pull-up/Pull-down on JTAG Pins

How internal pull-ups/downs are managed for JTAG pins.

SWJ Debug Port Connection

Shows the connection of SWJ-DP to a standard JTAG connector.

Recommendations

Printed Circuit Board (PCB)

Recommendations for multilayer PCB design for decoupling and shielding.

Component Position

Guidance on component placement for EMI reduction.

Ground and Power Supply (VSS,VDD)

Best practices for grounding and power supply implementation.

Decoupling Capacitors

Proper connection and placement of decoupling capacitors.

Unused I/Os and Features

Recommendations for unused MCU resources for EMC improvement.

WLCSP180 Package Recommendations

Specific recommendations for the WLCSP180 package.

Reference Design

Reference Design Description

Description of the reference design based on STM32F756NGH6.

Component References

Lists mandatory and optional components for the reference design.

Recommended PCB Routing Guidelines

PCB Stack-up

Examples of 4 and 6-layer PCB stack-ups for impedance matching.

Crystal Oscillator

Guidance on layout and routing for crystal oscillator circuits.

Power Supply Decoupling

Techniques for adequate power decoupling to prevent noise.

SDMMC Bus Interface

Connectivity and signal layout for the SDMMC bus interface.

Flexible Memory Controller (FMC) Interface

Connectivity and signal layout for the FMC controller.

Quadrature Serial Parallel Interface (Quad-SPI)

Connectivity and signal layout for the Quad-SPI interface.

Embedded Trace Macrocell (ETM)

Interface connectivity and signal layout for ETM.

Package Layout Recommendation

BGA 216 0.8 mm Pitch Design Example

Design parameters and fan-out examples for BGA 216 package.

WLCSP143 0.4 mm Pitch Design Example

Design parameters and layout example for WLCSP143 package.

Conclusion

Revision History