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[STM32H745xI/G] what means the "VOS0 and VOS1 are not available for industrial temperature range", STM32H745xxx3 sales types

SLiu.61
Associate II

‎2022-07-20 12:48 AM

quote "For STM32H745xxx3 sales types (industrial temperature range) the voltage regulator output can be set only to VOS2 or VOS3 in Run mode (VOS0 and VOS1 are not available for industrial temperature range)." from st.com/resource/en/datasheet/stm32h745xi.pdf

what happens if VOS0/1 is configured for the "STM32H745xxx3" types, especially when PWR_SMPS_1V8_SUPPLIES_LDO is configured instead of PWR_DIRECT_SMPS_SUPPLY? 

5 REPLIES 5
Peter BENSCH
ST Employee

‎2022-07-20 01:26 AM

Welcome, @SLiu.6​, to the community!

VOS0 and VOS1 operate the core at a higher voltage and allow higher clock rates of all buses. Because this can result in excessive power dissipation and corresponding heating in the STM32H745, which means that compliance with the operating parameters over the temperature range can no longer be guaranteed, operation is therefore not permitted.

Does it answer your question?

Regards

/Peter

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SLiu.61
Associate II

‎2022-07-20 01:54 AM

N.A.

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Peter BENSCH
ST Employee

‎2022-07-20 01:56 AM

You are operating it outside the permissible parameters and will therefore lose the warranty.

Regards

/Peter

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SLiu.61
Associate II
In response to Peter BENSCH

‎2022-07-20 02:01 AM

Thanks for the information!

Another thing is the overall performance of the microcontroller seems to be much better with the PWR_DIRECT_SMPS_SUPPLY config than with the PWR_SMPS_1V8_SUPPLIES_LDO. 

is this expected? 

I didn't find any description about this power configure difference that will lead to it behaving differently. could you help to clarify this as well?

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Peter BENSCH
ST Employee
In response to SLiu.61

‎2022-07-20 02:14 AM

Well, that's a different topic, for which a new thread should actually be created, but I'll try to address it once: The overall performance should actually be identical, as the optional SMPS only helps to reduce the overall power loss. If no SMPS is used, the total voltage difference between VDD and the core voltage is converted into heat. With SMPS enabled, there is a more energy-efficient conversion to a lower LDO input voltage, so there should be less heat.

Does it answer your question?

Regards

/Peter

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