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5.2

Boot pin connection

Figure 13. Boot mode selection implementation example

 shows the external connection required to select the

boot memory of STM32H723/33, STM32H725/35 and STM32H730 microcontrollers.

Figure 13. 

Boot mode selection implementation example

VDD

STM32H7

BOOT

10 kΩ                                

Resistor values are given only as a typical example.

5.3

System bootloader mode

The embedded bootloader code is located in the system memory. It is programmed by ST during production. It is
used to reprogram the Flash memory using one of the following serial interfaces.

Table 6. STM32H723/733, STM32H725/735 and STM32H730 microcontroller bootloader communication
peripherals

 shows the supported communication peripherals by the system bootloader.

Table 6. 

STM32H723/733, STM32H725/735 and STM32H730 microcontroller bootloader communication

peripherals

Bootloader peripherals

Bootloader pins

DFU

USB OTG FS (PA11/PA12) in device mode

USART1

PA9/PA10

USART2

PA2/PA3

USART3

PB10/PB11 or PD8/PD9

FDCAN1

PH13/PH14 or PD0/PD1

I2C1

PB6/PB9

I2C2

PF0/PF1

I2C3

PA8/PC9

SPI1

PA4/PA5/PA6/PA7

SPI3

PA15/PC10/PC11/PC12

SPI4

PE11 / PE12 / PE13 / PE14

AN5419

Boot pin connection

AN5419

 - 

Rev 2

page 27/50

Summary of Contents for STM32H723

Page 1: ...and STM32H730 microcontrollers Reference documents STM32H72x and STM32H73x datasheets STM32H723 733 STM32H725 735 and STM32H730 advanced Arm based 32 bit MCUs RM0468 STM32H723 733 STM32H725 735 and ST...

Page 2: ...ent applies to STM32H723 33 STM32H725 35 and STM32H730Arm based microcontroller lines Note Arm is a registered trademark of Arm Limited or its subsidiaries in the US and or elsewhere AN5419 General in...

Page 3: ...723 33 STM32H725 35 and STM32H730 microcontrollers require at least one single power supply to be fully operational Additional power supplies or voltage references are required for some use cases The...

Page 4: ...er switch Power switch Step Down Converter VCAP VSS VDDLDO VDDSMPS VLXSMPS VSSSMPS VFBSMPS VBAT VDDA VREF VREF VSSA Backup regulator VDD Backup RAM Power switch HSI CSI HSI48 HSE PLLs IOs Power switch...

Page 5: ...Supply regulation input SMPS feedback voltage sense VSSSMPS Supply input Ground for SMPS step down converter VDDLDO Supply input Supply for the integrated low drop out regulator VCAP Supply input outp...

Page 6: ...SS VCORE VCAP VDDLDO V reg off 5 External SMPS Supply Bypass VDD_extern VDDSMPS VLXSMPS VDD SMPS on VSSSMPS VFBSMPS VSS Ext reg VCORE 6 Bypass VCAP VDDLDO V reg off VDDSMPS VLXSMPS VDD SMPS off VSSSMP...

Page 7: ...capacitor required VDDSMPS connected to VSS when the converter is not used 1 62 to 3 6 V VDD Four different solutions are recommended 10 F best cost trade off ESR 10m 2x 10 F best area performance tra...

Page 8: ...output will be provided directly to the VDD33USB through the internal connection This pin is internally tied to VDD when it is not present in some specific packages In consequence the VDD supply level...

Page 9: ...1 F 5V Two different possible use cases 3 3V Battery 100 nF VDD 100 nF 4 7 F VDD Two different possible use cases 100nF 100 nF 2 2 F LDO enabled LDO disabled VCAP3 SMPS enabled SMPS disabled 10 F 220...

Page 10: ...either the USB VBUS or an external power supply can be used to provide the required voltage The internal regulator output supply is connected to the USB FS PHY and is also available on the VDD33USB p...

Page 11: ...D_MIN VDD VDD VDD33USB USB functional VDDUSB_MIN Figure 5 VDD33USB connected to external power supply VDD33USB forbidden area time VDD33USB_MAX USB functional VDD33USB forbidden area VDD33USB Power on...

Page 12: ...wer 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...

Page 13: ...aled by programming the voltage scaling VOS0 to VOS3 depending on the required performance see the reference manual STM32H723 733 STM32H725 735 and STM32H730 advanced Arm based 32 bit MCUs RM0468 In S...

Page 14: ...ded by an external regulator After start up the SMPS can be set by software to provide a regulated output of 1 8 V or 2 5 V The external regulator must ensure the correct voltage scaling for the run a...

Page 15: ...VPOR PDR falling edge tRSTTEMPO is approximately 377 s VPOR PDR rising edge is 1 67 V typical and VPOR PDR falling edge is 1 62 V typical Refer to the STM32H72x and STM32H73x datasheets for the actual...

Page 16: ...3 STM32H725 735 and STM32H730 advanced Arm based 32 bit MCUs RM0468 Three BOR levels are possible 2 1 V 2 4 V 2 7 V see the STM32H72x and STM32H73x datasheets for the electrical characteristics 2 2 3...

Page 17: ...anagement reset Figure 9 Reset circuit VDD Filter Pulse generator 20 s min RPU OR nreset System Reset NRST External reset CR RCC SFTRESET lpwr_rst wwdg1_out_rst iwdg1_out_rst pwr_por_rst pwr_bor_rst 2...

Page 18: ...ed to generate the high frequency clocks for the system and peripherals For both the HSE and LSE the clock can also be provided from an external source using the OCS_IN and OSC32_IN pins HSE bypass an...

Page 19: ...To RTC AWU RTCEN To IWDG1 tempo 1 2 4 8 HSION CSION HSI48ON HSIDIV HSEON SCGU System Clock Generation rcc_rtc_ck PKEU Peripheral Clock Enabling CSS LSEON pll1_r_ck traceclkin To TPIU CRS Clock recover...

Page 20: ...face SAI DFSDM I2S When an external clock reference is needed USB_PHY External clock input USB clock provided by the external PHY The embedded PHY supports FS For HS an external PHY needs to be used E...

Page 21: ...can use the USB SOF signal CSI 4 MHz No Low Power Internal oscillator Faster start up time than HSI Can be used for wake up from Stop mode LSI 32 KHz No Low Speed Internal clock for independent watch...

Page 22: ...r For CL1 and CL2 use high quality ceramic capacitors in the 5 pF to 25 pF range typical designed for high frequency applications and selected to meet the requirements of the crystal or resonator CL1...

Page 23: ...e HSI oscillator and the HSE oscillator is disabled If a failure is detected on the HSE clock this oscillator is automatically disabled a clock failure event is sent to the break inputs of the advance...

Page 24: ...UT CONTROL VDD VSS On off Output data register Input data register To on chip peripherals To ADC Each ADC has 6 inputs optimized for high performance INP0 to INP5 and INN0 to INN5 fast channels Refer...

Page 25: ...n the Pxy_C pads by closing the switch between the two pads 4 1 3 Package having Pxy available but nor the peer Pxy_C Closing the switch in the pad GPIOx_MODER bit connects an ADC slow input to the Px...

Page 26: ...ress space mapped on the AXIM interface All the RAM address space ITCM DTCM RAMs and SRAMs mapped on the AXIM interface The system memory bootloader The BOOT_ADD0 BOOT_ADD1 option bytes can be modifie...

Page 27: ...program the Flash memory using one of the following serial interfaces Table 6 STM32H723 733 STM32H725 735 and STM32H730 microcontroller bootloader communication peripherals shows the supported communi...

Page 28: ...30 advanced Arm based 32 bit MCUs RM0468 SWJ debug port section serial wire and JTAG 6 2 1 TPIU trace port The TPIU trace port comprises four data outputs plus one clock output The number of data outp...

Page 29: ...SWO if asynchronous trace is enabled PB3 NJTRST I JTAG test nReset PB4 6 3 2 Flexible SWJ DP pin assignment After RESET SYSRESETn or PORESETn all five pins used for the SWJ DP are assigned as dedicate...

Page 30: ...nfigured by software Special care must be taken with the TCK SWCLK pin which is directly connected to some of the clock flip flops since it should not toggle before JTAG I O is released by the user so...

Page 31: ...the supply loop area This is due to the fact that the supply loop acts as an antenna and therefore will become the EMI main transmitter and receiver All component free PCB areas must be filled with ad...

Page 32: ...ls the best possible electrical margin must be reached for the two logical states and slow Schmitt triggers are recommended to eliminate parasitic states Noisy signals such as clock Sensitive signals...

Page 33: ...ery board and the NUCLEO H723ZG and NUCLEO H725ZG Nucleo boards are good references that can be used as a basis for a specific application development Details of these boards are available on www st c...

Page 34: ...x layer PCB stack up example are intended as examples which can be used as guide lines for a stack up evaluation and selection These stack up configurations place the GND plane adjacent to the power p...

Page 35: ...ecommended decoupling capacitors to as many VDD VSS pairs as possible Connect the decoupling capacitor pad to the power and ground plane with a wide and short trace via This reduces the series inducta...

Page 36: ...nal trace exceeds this trace length speed criteria then a termination should be used The trace capacitance should not exceed 20 pF at 3 3 V and 15 pF at 1 8 V The maximum signal trace inductance shoul...

Page 37: ...PC8 SDMMC1_D0 PB9 SDMMC1_CDIR PC9 SDMMC1_D1 PC10 SDMMC1_D2 PC11 SDMMC1_D3 VDD R PU SDMMC1 R PU VDD_SD SD Card Socket CMD DAT0 DAT1 DAT2 DAT3 CLK VDD Open toggles during SD card boot Only default 3 3...

Page 38: ...in 15 pF with overall capacitive loading including Data Address SDCLK and Control no more than 20 pF 9 4 3 Octo SPI interface Interface connectivity The Octo SPI is a specialized communication interfa...

Page 39: ...TOSPI1 OCTOSPI2 RWDS DQSM RSTO INT GPIO GPIO Port1 Port2 PG12 OCSPI2_NCS PF4 OCSPI2_CLK OCSPI2_IO0 IO7 VDD R PU 10k VDD Octo SPI memory CK DQ 0 7 CS RESET VDD VCC optional 8 bits x8 PF5 CK 22 OCSPI2_N...

Page 40: ...en the OCTOSPIs are disabled The multiplexed mode can be very useful for some packages where the port2 is not mapped 9 4 4 DFSDM interface The digital filter for the sigma delta modulator DFSDM is ded...

Page 41: ...are traced using the embedded trace macrocell ETM The ETM interface is synchronous with the four data bus lines D 0 3 and the clock signal CLK Interface signals layout guidelines Reference the plane u...

Page 42: ...8 I2C1 Touch screen or communication interface OCTOSPIM_P1 External memory USART2 Communication interface SPI1 Communication interface USB FS GPIO Remaining GPIO available LQFP100 no SMPS Audio beam...

Page 43: ...11 Conclusion This application note must be used as reference when starting a new design with an STM32H723 33 STM32H725 35 and STM32H730 microcontroller AN5419 Conclusion AN5419 Rev 2 page 43 50...

Page 44: ...tion and updated values of external capacitors connected to VLXSMPS in Figure 3 Power supply component layout Only one additional external inductor required to improve the overall system power consump...

Page 45: ...BOR 16 2 2 3 Programmable voltage detector PVD 16 2 2 4 Analog voltage detector AVD 17 2 2 5 System reset 17 2 2 6 Bypass mode 17 3 Clocks 18 3 1 Introduction 18 3 1 1 HSE and LSE bypass external user...

Page 46: ...th standard JTAG connector 30 7 Recommendations 31 7 1 Printed circuit board 31 7 2 Component position 31 7 3 Ground and power supply VSS VDD 31 7 4 Decoupling 31 7 5 Other signals 32 7 6 Unused I Os...

Page 47: ...DFSDM interface 40 9 4 5 Embedded trace macrocell ETM 41 10 Use case examples 42 11 Conclusion 43 Revision history 44 Contents 45 List of tables 48 List of figures 49 AN5419 Contents AN5419 Rev 2 page...

Page 48: ...Table 5 Boot modes 26 Table 6 STM32H723 733 STM32H725 735 and STM32H730 microcontroller bootloader communication peripherals 27 Table 7 TPIU trace pins 28 Table 8 External debug trigger pins 29 Table...

Page 49: ...s for ADC1 and ADC2 24 Figure 13 Boot mode selection implementation example 27 Figure 14 Host to board connection 28 Figure 15 JTAG connector implementation 30 Figure 16 Typical layout for VDD VSS pai...

Page 50: ...ts and ST assumes no liability for application assistance or the design of Purchasers products No license express or implied to any intellectual property right is granted by ST herein Resale of ST pro...

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