Features
Includes ST state-of-the-art patented technology
Core
• 32-bit Arm® Cortex®-M7 core with double-precision FPU and L1 cache:
16 Kbytes of data and 16 Kbytes of instruction cache allowing to fill one cache
line in a single access from the 128-bit embedded flash memory; frequency up
to 280 MHz, MPU, 599 DMIPS/ 2.14 DMIPS/MHz (Dhrystone 2.1), and DSP
instructions
Memories
• Up to 2 Mbytes of flash memory with read while write support, plus 1 Kbyte of
OTP memory
• ~1.4 Mbytes of RAM: 192 Kbytes of TCM RAM (inc. 64 Kbytes of ITCM RAM +
128 Kbytes of DTCM RAM for time critical routines), 1.18 Mbytes of user SRAM,
and 4 Kbytes of SRAM in Backup domain
• 2x Octo-SPI memory interfaces, I/O multiplexing and support for serial PSRAM/
NOR, Hyper RAM/flash frame formats, running up to 140 MHz in SRD mode and
up to 110 MHz in DTR mode
• Flexible external memory controller with up to 32-bit data bus:
– SRAM, PSRAM, NOR flash memory clocked up to 125 MHz in
Synchronous mode
– SDRAM/LPSDR SDRAM
– 8/16-bit NAND flash memories
• CRC calculation unit
Security
• ROP, PC-ROP, active tamper, secure firmware upgrade support
General-purpose input/outputs
• Up to 168 I/O ports with interrupt capability
– Fast I/Os capable of up to 133 MHz
– Up to 164 5-V-tolerant I/Os
Low-power consumption
• Stop: down to 32 μA with full RAM retention
• Standby: 2.8 μA (Backup SRAM OFF, RTC/LSE ON, PDR OFF)
• VBAT: 0.8 μA (RTC and LSE ON)
Clock management
• Internal oscillators: 64 MHz HSI, 48 MHz HSI48, 4 MHz CSI, 32 kHz LSI
• External oscillators: 4-50 MHz HSE, 32.768 kHz LSE
• 3× PLLs (1 for the system clock, 2 for kernel clocks) with fractional mode
Reset and power management
• 2 separate power domains, which can be independently clock gated to maximize power efficiency:
– CPU domain (CD) for Arm® Cortex® core and its peripherals, which can be independently switched in
Retention mode
– Smart run domain (SRD) for reset and clock control, power management and some peripherals
• 1.62 to 3.6 V application supply and I/Os
• POR, PDR, PVD and BOR
• Dedicated USB power embedding a 3.3 V internal regulator to supply the internal PHYs
• Dedicated SDMMC power supply
• High power efficiency SMPS step-down converter regulator to directly supply VCORE or an external circuitry
• Embedded regulator (LDO) with configurable scalable output to supply the digital circuitry
• Voltage scaling in Run and Stop mode
• Backup regulator (~0.9 V)
• Low-power modes: Sleep, Stop and Standby
• VBAT battery operating mode with charging capability
• CPU and domain power state monitoring pins
Interconnect matrix
• 3 bus matrices (1 AXI and 2 AHB)
• Bridges (5× AHB2APB, 3× AXI2AHB)
5 DMA controllers to unload the CPU
• 1× high-speed general-purpose master direct memory access controller (MDMA)
• 2× dual-port DMAs with FIFO and request router capabilities
• 1× basic DMA with request router capabilities
• 1x basic DMA dedicated to DFSDM
Up to 35 communication peripherals
• 4× I2C FM+ interfaces (SMBus/PMBus)
• 5× USART/5x UARTs (ISO7816 interface, LIN, IrDA, modem control) and 1x LPUART
• 6× SPIs, including 4 with muxed full-duplex I2S audio class accuracy via internal audio PLL or external clock
and 1 x SPI/I2S in LP domain (up to 125 MHz)
• 2x SAIs (serial audio interface)
• SPDIFRX interface
• SWPMI single-wire protocol master interface
• MDIO Slave interface
• 2× SD/SDIO/MMC interfaces (up to 133 MHz)
• 2× CAN controllers: 2 with CAN FD, 1 with time-triggered CAN (TT-CAN)
• 1× USB OTG interfaces (1HS/FS)
• HDMI-CEC
• 8- to 14-bit camera interface up to 80 MHz
• 8-/16-bit parallel synchronous data input/output slave interface (PSSI)
11 analog peripherals
• 2× ADCs with 16-bit max. resolution (up to 24 channels, up to 3.6 MSPS)
• 1× analog and 1x digital temperature sensors
• 1× 12-bit single-channel DAC (in SRD domain) + 1× 12-bit dual-channel DAC
• 2× ultra-low-power comparators
• 2× operational amplifiers (8 MHz bandwidth)
• 2× digital filters for sigma delta modulator (DFSDM), 1x with 8 channels/8 filters and 1x in SRD domain with 2
channels/1 filter
Graphics
• LCD-TFT controller up to XGA resolution
• Chrom-ART graphical hardware Accelerator (DMA2D) to reduce CPU load
• Hardware JPEG Codec
• Chrom-GRC™ (GFXMMU)
Up to 19 timers and 2 watchdogs
• 2× 32-bit timers with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input (up to
280 MHz)
• 2× 16-bit advanced motor control timers (up to 280 MHz)
• 10× 16-bit general-purpose timers (up to 280 MHz)
• 3× 16-bit low-power timers (up to 280 MHz)
• 2× watchdogs (independent and window)
• 1× SysTick timer
• RTC with sub-second accuracy and hardware calendar
Debug mode
• SWD and JTAG interfaces
• 4 KB Embedded Trace Buffer
1x 32-bit, NIST SP 800-90B compliant, true random generator
96-bit unique ID
All packages are ECOPACK2 compliant

Description
STM32H7A3xI/G devices are based on the high-performance Arm® Cortex®-M7 32-bit RISC core operating at
up to 280 MHz. The Cortex® -M7 core features a floating point unit (FPU) which supports Arm® double-precision
(IEEE 754 compliant) and single-precision data-processing instructions and data types. STM32H7A3xI/G devices
support a full set of DSP instructions and a memory protection unit (MPU) to enhance application security.
STM32H7A3xI/G devices incorporate high-speed embedded memories with a dual-bank flash memory of up
to 2 Mbytes, around 1.4 Mbyte of RAM (including 192 Kbytes of TCM RAM, 1.18 Mbytes of user SRAM and
4 Kbytes of backup SRAM), as well as an extensive range of enhanced I/Os and peripherals connected to four
APB buses, three AHB buses, a 32-bit multi-AHB bus matrix and a multi layer AXI interconnect supporting internal
and external memory access.
All the devices offer two ADCs, two DACs (one dual and one single DAC), two ultra-low power comparators, a
low-power RTC, 12 general-purpose 16-bit timers, two PWM timers for motor control, three low-power timers, a
true random number generator (RNG). The devices support nine digital filters for external sigma delta modulators
(DFSDM). They also feature standard and advanced communication interfaces.
• Standard peripherals
– Four I2Cs
– Five USARTs, five UARTs and one LPUART
– Six SPIs, four I2Ss in full-duplex mode. To achieve audio class accuracy, the I2S peripherals can be
clocked via a dedicated internal audio PLL or via an external clock to allow synchronization.
– Two SAI serial audio interfaces, out of which one with PDM
– One SPDIFRX interface
– One single wire protocol master interface (SWPMI)
– One 16-bit parallel synchronous slave interface (PSSI) sharing the same interface as the digital
camera)
– Management Data Input/Output (MDIO) slaves
– Two SDMMC interfaces (one can be supplied from a supply voltage separate from that of all other I/Os)
– A USB OTG high-speed with full-speed capability (with the ULPI)
– One FDCAN plus one TT-CAN interface
– Chrom-ART Accelerator
– HDMI-CEC
• Advanced peripherals including
– A flexible memory control (FMC) interface
– Two octo-SPI memory interface
– A digital camera interface for CMOS sensors (DCMI)
– A graphic memory management unit (GFXMMU)
– An LCD-TFT display controller (LTDC)
– A JPEG hardware compressor/decompressor
Refer to Table 1. STM32H7A3xI/G features and peripheral counts for the list of peripherals available on each part
number.
STM32H7A3xI/G devices operate in the –40 to +85 °C ambient temperature range from a 1.62 to 3.6 V
power supply. The supply voltage can drop down to 1.62 V by using an external power supervisor (see
Section 3.5.2 Power supply supervisor) and connecting the PDR_ON pin to VSS. Otherwise the supply voltage
must stay above 1.71 V with the embedded power voltage detector enabled.
The USB OTG_HS/FS interfaces can be supplied either by the integrated USB regulator or through a separate
supply input.
A dedicated supply input is available for one of the SDMMC interface for package with more than 100 pins. It
allows running from a different voltage level than all other I/Os.
A comprehensive set of power-saving mode allows the design of low-power applications.
The CPU and domain states can be directly monitored on some GPIOs configured as alternate functions.
STM32H7A3xI/G devices are offers in several packages ranging from 64 pins to 225 pins/balls. The set of
included peripherals changes with the device chosen.
These features make the STM32H7A3xI/G microcontrollers suitable for a wide range of applications:
• Motor drive and application control
• Medical equipment
• Industrial applications: PLC, inverters, circuit breakers
• Printers, and scanners
• Alarm systems, video intercom, and HVAC
• Home audio appliances
• Mobile applications, Internet of Things
• Wearable devices: smart watches.
Figure 1. STM32H7A3xI/G block diagram shows the general block diagram of the device family.