ST STM32H74xI/G User manual

May 2019 AN4938 Rev 4 1/46

AN4938

Application note

Getting started with STM32H74xI/G and STM32H75xI/G

hardware development

Introduction

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

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 STM8S, STM8A and STM32 microcontrollers 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

2/46 AN4938 Rev 4

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 reset ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.3.6 Internal reset 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

AN4938 Rev 4 3/46

AN4938 Contents

6 Debug management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6.2 SWJ debug port (serial wire and JTAG) . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6.2.1 TPIU trace port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6.2.2 External debug trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.3 Pinout and debug port pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.3.1 SWJ debug port pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.3.2 Flexible SWJ-DP pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.3.3 Internal pull-up and pull-down on JTAG pins . . . . . . . . . . . . . . . . . . . . . 31

6.3.4 SWJ debug port connection with standard JTAG connector . . . . . . . . . 31

7 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.1 Printed circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.2 Component position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.3 Ground and power supply (VSS,VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.4 Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.5 Other signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.6 Unused I/Os and features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

8 Reference design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1 Reference design description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1.1 Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1.3 Boot mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1.4 SWJ interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1.5 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.2 Component references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9 Recommended PCB routing guidelines for

STM32H74xI/G and STM32H75xI/G devices . . . . . . . . . . . . . . . . . . . . . 37

9.1 PCB stack-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.2 Crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.3 Power supply decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.4 High speed signal layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.4.1 SDMMC bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.4.2 Flexible memory controller (FMC) interface . . . . . . . . . . . . . . . . . . . . . . 40

Contents AN4938

4/46 AN4938 Rev 4

9.4.3 Quadrature serial parallel interface (QUADSPI) . . . . . . . . . . . . . . . . . . 41

9.4.4 Embedded trace macrocell (ETM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

AN4938 Rev 4 5/46

AN4938 List of tables

List of tables

Table 1. Applicable products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Boot modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 3. STM32H74xI/G and STM32H75xI/G bootloader communication peripherals . . . . . . . . . . 26

Table 4. TPIU trace pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 5. External debug trigger pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 6. SWJ debug port pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 7. Flexible SWJ-DP assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 8. Mandatory components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 9. Optional components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

List of figures AN4938

6/46 AN4938 Rev 4

List of figures

Figure 1. VDD33USB connected to VDD power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 2. VDD33USB/VDD50USB connected to external power supply . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 3. Power supply overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 4. Power on reset/power down reset waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 5. PVD threshold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 6. Reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 7. Power supply supervisor interconnection with internal reset OFF . . . . . . . . . . . . . . . . . . . 18

Figure 8. NRST circuitry timing example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 9. STM32CubeMX example screen-shot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 10. HSE external clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11. HSE crystal/ceramic resonators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 12. LSE external clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 13. LSE crystal/ceramic resonators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 14. Boot mode selection implementation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 15. Host to board connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 16. JTAG connector implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 17. Typical layout for VDD/VSS pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 18. STM32H753XI reference schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 19. Four layer PCB stack-up example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 20. Six layer PCB stack-up example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 21. Decoupling capacitor placement depending on package type . . . . . . . . . . . . . . . . . . . . . . 39

Figure 22. Example of decoupling capacitor placed underneath

the STM32H74xI/G and STM32H75xI/G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

AN4938 Rev 4 7/46

AN4938 General information

1 General information

This document applies to STM32H74xI/G and STM32H75xI/G Arm®(a)-based devices.

2 Power supplies

2.1 Introduction

STM32H74xI/G and STM32H75xI/G devices require a 1.71 to 3.6 V operating voltage

supply (VDD), which can be reduced down to 1.62 V by using an external power supervisor

and connecting PDR_ON pin to VSS (refer to the datasheets for details).

The digital power can be supplied either by a internal system supply voltage regulator or

directly by an external supply voltage. This digital power voltage can be set dynamically at

different values, the highest value allowing to achieve the maximum performance.

The real-time clock (RTC), the RTC backup registers, and the backup SRAM (BKP SRAM)

can be powered from the VBAT voltage (1.2 to 3.6 V) when the main VDD supply is powered

OFF.

Note: Refer to the product datasheets for more details on the supply voltage range.

2.1.1 Independent analog supply and reference voltage

To improve analog peripheral performance, the analog peripherals feature an independent

power supply which can be separately filtered and shielded from noise on the PCB:

•The analog supply voltage input is available on a separate VDDA pin.

•An isolated supply ground connection is provided on the pin VSSA.

To ensure a better accuracy of low-voltage inputs, the user can connect a separate external

reference voltage on VREF+.

In addition, the STM32H74xI/G and STM32H75xI/G microcontrollers embed an internal

voltage reference buffer, which can be used as voltage reference for ADCs, DACs, as well

as external components through the VREF+ pin. This buffer supports four voltages that can

be configured through the VREFBUF_CSR register.

When available (depending on the package), VREF– pin must be externally tied to VSSA.

VDDA minimum value (VDDA_MIN) depends on the analog peripheral and on whether a

reference voltage is provided or not:

•If no analog peripheral is used, VDDAmin equals 0 V.

•When an ADC or a comparator is used, VDDA_MIN equals 1.62 V.

•When a DAC is used, VDDA_MIN equals 1.8V.

a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.

Power supplies AN4938

8/46 AN4938 Rev 4

•When an OPAMP is used, VDDA_MIN equals 2.0 V.

•When a reference voltage (VREFBUF_OUT) is provided by the device on VREF+ pin,

VDDA_MIN depends on the required level for this voltage.

Note: Refer to the product datasheets for more details on VREF+ reference voltage range.

2.1.2 USB transceiver independent power supply

There are different ways to supply the USB transceivers, depending on VDD33USB and

VDD50USB availability:

•When the VDD50USB pin is available, this pin can be used to supply an internal

regulator dedicated to USB transceivers. In this case, VDD50USB pin should receive a

voltage ranging from 4.0 to 5.5 V, typically supplied from the VBUS line of the USB

connector. The regulated power (3.0 to 3.6 V) is available on VDD33USB.

In this configuration VDD50USB voltage must respect the following condition:

An external capacitor must be connected to VDD33USB.

•When the VDD33USB pin is available, this pin can be used to supply the internal

transceiver. In this case, VDD33USB pin should receive a voltage ranging from 3.0 to

3.6 V. If VDD50USB is also available, it must be connected to VDD33USB. As an

example, when the device is powered at 1.8 V, an independent 3.3 V power supply can

be applied to VDD33USB.

When VDD33USB is connected to a separate power supply, it is independent from VDD

and VDDA. It must be the last supply applied and the first supply switched OFF. The

following conditions must be respected (see Figure 2):

– During the power-on and power-down phases (VDD < VDD minimum value),

VDD33USB should always be lower than VDD.

–V

DD33USB rising and falling time specifications must be respected (refer to table

power-up/power-down operating conditions (regulator ON) and table power-

up/power-down operating conditions (regulator OFF) provided in the device

datasheets).

– In operating mode, VDD33USB can be either lower or higher than VDD:

If a USB interface is used (USB OTG_HS/OTG_FS), the associated GPIOs

Figure 2).

VDD33USB supplies both USB OTG_HS and USB OTG_FS transceivers. If only

one USB transceiver is used in the application, the GPIOs associated to the other

USB transceiver are still supplied by VDD33USB.

If no USB interface is used (USB OTG_HS/OTG_FS), the associated GPIOs

In the above two configurations, an external capacitor must be connected to

VDD33USB.

•When neither VDD33USB nor VDD50USB is available, VDD pins are use to supply

USB transceivers and must be in the range of 3.0 to 3.6 V for the transceiver to operate

correctly.

VDD50USB VDD 300 mV+<

AN4938 Rev 4 9/46

AN4938 Power supplies

Figure 1. VDD33USB connected to VDD power supply

Figure 2. VDD33USB/VDD50USB connected to external power supply

1. VDDx can be any power supply voltage among VDDA, VDD33USB, VDD50USB and VDDDSI.

2. If the SMPS is available, VDD and VDDSMPS must be wired together to follow the same voltage sequence.

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Power supplies AN4938

10/46 AN4938 Rev 4

2.1.3 Battery backup domain

Backup domain description

To retain the content of the RTC backup registers, backup SRAM, and supply the RTC when

VDD is turned off, VBAT pin can be connected to an optional 1.2-3.6 V standby voltage

supplied by a battery. Otherwise, VBAT must be connected to another source, such as VDD.

When the backup domain is supplied by VBAT (analog switch connected to VBAT since VDD

is not present), the following functions are available:

•PC14 and PC15 can be used as LSE pins only.

•PC13 can be used as tamper pin (TAMP1).

•PI8 can be used as tamper pin (TAMP2).

•PC1 can be used as tamper pin (TAMP3).

During tRSTTEMPO (temporization at VDD startup) or after a power-down reset (PDR) is

detected, the power switch between VBAT and VDD remains connected to VBAT

During the startup phase, if VDD is established in less than tRSTTEMPO and it is higher than

VBAT + 0.6 V, a current may be injected into VBAT pin through an internal diode connected

between VDD and the power switch (VBAT). If the power supply/battery connected to the

VBAT pin cannot support this current injection, it is strongly recommended to connect an

external low-drop diode between this power supply and the VBAT pin.

Refer to the device datasheets for the actual value of tRSTTEMPO.

Battery charging

When VDD is present, the external battery connected to VBAT can be charged through an

internal resistance. This operation can be performed either through an internal 5 kΩor

1.5 kΩresistor. The resistor value can be configured by software.

Battery charging is automatically disabled in VBAT mode.

2.1.4 LDO voltage regulator

The LDO voltage regulator is always enabled after reset with a default output level set to

power scale 3 (VOS3). The LDO can operate in three different modes depending on the

application operating modes:

•In Run mode, the regulator supplies full power to the core and the digital domain.

•In Stop mode, the regulator supplies low power to the core and to the digital domain,

thus preserving the contents of the registers and SRAM.

•In Standby mode, the regulator is powered down. The contents of the registers and

SRAM are lost except for those related to the standby circuitry and the backup domain.

In Run and Stop mode, the LDO voltage regulator can be dynamical scaled by software to

different voltage levels: VOS0, VOS1, VOS2, and VOS3, SVOS3, SVOS4 or SVOS5.

The LDO regulator requires a capacitor on VCAP pins.

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