STM32H7 CPU speed increase

[simonellwood9171]

I have just realized, that the CPU speed of the STM32H7 series has increased from 400 MHz to 480 MHz, on the ST website and in the documents.

The STM32MUX clock tool, doesn't though know about this yet.

I have not been able to find any info on, if this is some new measurements, so that this speed increase affects all revisions of the STM32H7's, or if this only affects the newer revisions.

Has anybody stumbled upon this information somewhere?

[waclawek.jan]

This is for the new rev.V of the 'H743/753/750 silicon. See my latest post in https://community.st.com/s/question/0D50X0000AaZACJSQ4/which-silicon-revision-code-is-actually-in-production-for-the-stm32h7-family . It's all in the DS/RM.

JW

[simonellwood9171]

Thank you very much for that information! Then I will not try this with the rev. Y's!

[Tesla DeLorean]

You know you can just change the PLL setting in SystemClock_Config(), right?

Current parts can run at 500 MHz if pushed.

Documentation for 480 MHz relates to V Step silicon only.

[simonellwood9171]

Yes, but my concern is, if it is then stable. I need my instruments to be as stable as possible. But thanks for the suggestion anyway.

[MikeDB]

All the ones I have are rev Y :(

[Khouloud GARSI]

Dear @MikeDB​ ,

New silicon revision V fixes the major limitations identified on revision Y. In case you think to migrate to the new revision, I advise you to have a look on AN5312, it shows the differences to take in consideration when migrating from one revision to another.

Link to AN:

https://www.st.com/content/ccc/resource/technical/document/application_note/group1/95/22/7c/0c/57/de/4b/f9/DM00609692/files/DM00609692.pdf/jcr:content/translations/en.DM00609692.pdf

Khouloud.

[MikeDB]

All my suppliers are still shipping Rev Y. When will rev V be on general availability ? Can I get a sample of rev V H750 in the meantime to check my software still works correctly ?

[Khouloud GARSI]

Hello @simonellwood9171​ ,

• I have just realized, that the CPU speed of the STM32H7 series has increased from 400 MHz to 480 MHz, on the ST website and in the documents.

-> Correct! The STM32H7 in new silicon revision V could reach the 480 MHz. 

• The STM32MUX clock tool, doesn't though know about this yet.

-> The new revision of the STM32CubeMX tool will be updated accordingly and the new reached frequency will be mentioned there (could be configured using the tool).

Khouloud.

[Frederic LE CAM]

A Product Change Notification (PCN) has been sent out few days ago to our customers to inform Rev Y users that a migration of their application to Rev V must be contemplated. As usual, we leave our customers the time to qualify this migration and meanwhile we can continue to support the deliveries with current Rev Y. This has to be feedback to st as a response to the PCN via your regular procurement channels to make sure you keep receiving the older revision  until you get ready for the new one.  The PCN explains how to differentiate the Revsions and how to procure samples of the new Rev.

[MikeDB]

Where do we see this PCN ? All I have seen is App note AN5312. My distributor doesn't even know what revision they have. So how do I get a sample of rev V to begin upgrading our firmware ?

Also our Discovery kits are now useless as we can't debug the new Flash programming routines on them. Will you be offering some sort of swap on these ?