Which STM32H7 have CORDIC & double precision support ?

[Gowri123]

 

Hello ST Community,

I’m currently trying to select the right MCU/board from the STM32H7 series, but I’m a bit confused between the following options:

• STM32H723

• STM32H725

• STM32H735

• STM32H7A3VGT6

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My requirements:

• Need CORDIC support for fast math operations

• Require high-precision calculations (double precision floating point)

• Planning to implement a high-performance data processing pipeline (DPU-like workload)

• Would prefer a board with good STM32CubeH7 example support

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My confusion:

1. Do all the above MCUs support CORDIC, or only specific variants?

2. Is double precision (64-bit floating point) actually supported in hardware on these devices, or only single precision (FPU)?

3. Which of these would be the best fit for heavy math/DSP workloads?

4. Are there recommended Nucleo/Discovery/Eval boards for these MCUs that already have:

   • Working examples (DSP / math / AI)

   • Good documentation and community support

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What I’m trying to avoid:

I don’t want to choose a device and later realize:

• It doesn’t support CORDIC

• Or double precision is too slow (software only)

• Or there is limited example code available

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If anyone has experience with these MCUs (especially for DSP / math-heavy applications), your suggestions would really help me choose the right board.

Thanks in advance!

[Andrew Neil]

These would be governed by the chip - not the board.

Check out the STM32H7 series  Product Selector - you can filter by FPU & Co-Processor:

https://www.st.com/en/microcontrollers-microprocessors/stm32h7-series/products.html

 

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@Gowri123 wrote:

4. Are there recommended Nucleo/Discovery/Eval boards for these MCUs that already have:

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Once you've decided on a chip, go to its Product Page, and look on the 'Tools & Software' tab - that will show available boards; eg,

https://www.st.com/en/microcontrollers-microprocessors/stm32h7s7i8.html#tools-software

 

PS:

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@Gowri123 wrote:

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What I’m trying to avoid:

I don’t want to choose a device and later realize:

• It doesn’t support CORDIC

• Or double precision is too slow (software only)

• Or there is limited example code available

---

You can browse the available examples & software  in CubeMX without having any available hardware.

Also look on the 'Tools & Software' tab for H7 family:

https://www.st.com/en/microcontrollers-microprocessors/stm32h7-series.html#tools-software

[AScha.3]

Hi,

so i would recommend simply the fastest H7 : H7Sx ; (all H7 have double float in hardware )

can check it with : NUCLEO-H7S3L8

Mouser-Nr.:  511-NUCLEO-H7S3L8

+32-bit Arm® Cortex®-M7 CPU with MPU and DP-FPU, L1 cache: 32+32-Kbyte instruction and data cache allowing 0-wait state execution from embedded flash memory and external memories, frequency up to 600 MHz, 1284 DMIPS/2.14 DMIPS/MHz (Dhrystone 2.1), and DSP instructions

+ 24-bit CORDIC rotation engine

 

or, if you can wait some month...the  STM32V8 series,   available in Q3 this year (2026).

+   800 MHz Cortex®-M85 core with Helium MVE

https://www.st.com/content/st_com/en/campaigns/stm32v8-high-performance-cortex-m85-mcu-z11.html

 

[Andrew Neil]

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@AScha.3 wrote:

all H7 have double float in hardware

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Indeed. But not all have CORDIC.

[FBL]

Hi @Gowri123 

Based on STM32 Sidekick,

• STM32H7A3xI/G: Features a high-performance Arm Cortex-M7 core with a floating-point unit (FPU) supporting both double-precision (IEEE 754 compliant) and single-precision instructions. Also includes the CORDIC hardware accelerator for trigonometric and hyperbolic functions.
• STM32H723xE/G, STM32H730xB, STM32H7R3/7S3, STM32H7R7/7S7, STM32H725/735: All these product lines are listed as featuring both the CORDIC accelerator and double-precision FPU.
• STM32H733xG: Explicitly mentioned as having both a CORDIC coprocessor and a double-precision FPU.

All STM32H7 devices that include the CORDIC coprocessor also feature a double-precision FPU (IEEE 754 compliant), with no exceptions noted in the official documentation. This applies to devices such as STM32H730xB, STM32H725xE/G, STM32H723xE/G, STM32H7Sxx8, and STM32H7Rxx8.

Update: Checked datasshet of H7A3x doesn't include CORDIC.

[Andrew Neil]

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@FBL wrote:

Based on STM32 Sidekick,

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@Gowri123 in case you'd didn't know, Sidekick is ST's AI assisant:

STM32 Sidekick: the AI-powered tool that accelerates your design journey

How to use STM32 Sidekick

Look for this icon at bottom-right of the screen:

 

[LCE]

Yes, but...

Better check the device's datasheet and reference manual.

The H733 datasheet says the FPU is double precision capable, but about the HW CORDIC (chapter 3.6):

CORDIC features
• 24-bit CORDIC rotation engine
• Circular and Hyperbolic modes
• Rotation and Vectoring modes
• Functions: Sine, Cosine, Sinh, Cosh, Atan, Atan2, Atanh, Modulus, Square root,
Natural logarithm
• Programmable precision up to 20-bit
• Fast convergence: 4 bits per clock cycle
• Supports 16-bit and 32-bit fixed point input and output formats
• Low latency AHB slave interface
• Results can be read as soon as ready without polling or interrupt
• DMA read and write channels

 

Another good example that quick web searches and "AI" might lead you the wrong way.
Searching / asking for "double precision CORDIC", and the answer is: "yes, it has double precision FPU and a CORCDIC".
Me not like...