STM32H753 Current Comsumption

[Koichi-H]

Hello, in the STM32H753xI datasheet, Table 11, "Total current into sum of all VDD power lines (620mA)," is the voltage condition VDD = 3.3V? I would also like to know the current at VDD = 1.8V.

[Peter BENSCH]

Welcome @Koichi-H, to the community!

You probably mean table 21 of the data sheet, right?

No specific VDD is mentioned there as a condition, because the currents are independent of it.

Regards
/Peter

[Koichi-H]

Hi, Peter

Thank you for getting back to me so quickly.

I am currently working on a revised design for an existing circuit board. While the existing board was designed by someone else, the current consumption calculation for the existing board was based on the 620mA value in Table 11, and I am using the same method this time.

Due to changes in peripheral devices, I am changing the voltage of the STM32H753xI from 3.3V to 1.8V, so I re-checked the current consumption.

I understand that there is no difference in current consumption depending on the voltage.

Regards

[Andrew Neil]

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@Koichi-H wrote:

the current consumption calculation for the existing board was based on the 620mA value in Table 11

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As @Peter BENSCH and @PatrickF already said, that table does not tell you the current consumption of the chip.

That table gives limits which your design must not exceed - it's a limit on what you can source & sink through the IO pins:

https://www.st.com/resource/en/datasheet/stm32h753zi.pdf#page=104

 

For the current consumed by the chip itself, you need to look at Tables 19-29 - in section 6.3.6:

 

[PatrickF]

Hi @Koichi-H 

this value is likely an absolute maximum rating (i.e. which current the IC physical could sustain without damage), not a consumption value given at a specific condition. The power consumption itself is given elsewhere in the datasheet.

VDD current depend on IC consumption itself, but also on current given to the outside thru the IO activity, which is not negligible if there is many fast toggling interface with large load. This has to be computed on customer side as it fully depend on the product use case.

 

Regards.