August 2023 AN4938 Rev 6 1/47

AN4938

Application note

Getting started with STM32H74xI/G and STM32H75xI/G

MCU hardware development

Introduction

This application note is intended for system designers who develop applications based on

the STM32H750 Value line, STM32H742, STM32H743/753, STM32H745/755, and

STM32H747/757 lines, and who need an implementation overview of the following

hardware 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 STM32H74xI/G and STM32H75xI/G microcontrollers.

Reference documents

The following documents are available on www.st.com:

• STM32H742xI/G and STM32H743xI/G datasheet

• STM32H745xI/G datasheet

• STM32H747xI/G datasheet

• STM32H750xB datasheet

• STM32H753xI/G datasheet

• STM32H755xI/G datasheet

• STM32H757xI/G datasheet

•

Oscillator design guide for STM8AF/AL/S, STM32 MCUs and MPUs application note

(AN2867)

• STM32 microcontroller system memory boot mode application note (AN2606).

Table 1. Applicable products

Generic part numbers Corresponding product lines

STM32H74xI/G,

STM32H75xI/G

STM32H742, STM32H750 Value, STM32H743/753,

STM32H745/755, STM32H747/757

www.st.com

Contents AN4938

2/47 AN4938 Rev 6

Contents

1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1.1 Independent analog supply and reference voltage . . . . . . . . . . . . . . . . . 7

2.1.2 USB transceiver independent power supply . . . . . . . . . . . . . . . . . . . . . . 8

2.1.3 Battery backup domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1.4 LDO voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1.5 SMPS step-down converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Power supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3 Reset and power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.1 Power-on reset (POR)/power-down reset (PDR) . . . . . . . . . . . . . . . . . . 15

2.3.2 Programmable voltage detector (PVD) . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.3 Analog voltage detector (AVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.3.4 System reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.3.5 Internal power supervisor ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.3.6 Internal power supervisor OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.3.7 Bypass mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3 Alternate function mapping to pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4 Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.1 HSE oscillator clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.1.1 External user clock (HSE bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.1.2 External crystal/ceramic resonator (HSE crystal) . . . . . . . . . . . . . . . . . 22

4.2 LSE oscillator clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.2.1 External clock (LSE bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.2.2 External crystal/ceramic resonator (LSE crystal) . . . . . . . . . . . . . . . . . . 23

4.3 Clock security system (CSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5 Boot configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.1 Boot mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.2 Boot pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.3 System bootloader mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26