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1.8V Power Supply on STM32H735

vmartinm
Associate

Hello,

I'm designing a board based on the STM32H735IGK3 microcontroller in which I want to include two HyperBus / OctoSPI memories in multiplexed mode. For this kind of memories there is more avaiblity on 1.8V power supply, but reading the documentation of the microcontroller, I'm not sure if I can power it without lose performance.

vmartinm_0-1689594028152.png

I plan to use the included SMPS to optimice the power consumption, but I understand that if I use VDD=1.8V I can't  use the VOS1 and VOS0 modes, right?

Best regards.

1 ACCEPTED SOLUTION

Accepted Solutions
KDJEM.1
ST Employee

Hello @vmartinm and welcome to the Community 🙂,

The minimum VDD that can be used with VOS0 and VOS1 SMPS  is 2.2V.

So if your application requires VDD=1.8 V and the SMPS, you need to use VOS2 or VOS3 or SVOS4 or SVOS5.

When your question is answered, please close this topic by choosing "Accept as Solution". This will help other users find that answer faster.

Kaouthar

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

2 REPLIES 2
KDJEM.1
ST Employee

Hello @vmartinm and welcome to the Community 🙂,

The minimum VDD that can be used with VOS0 and VOS1 SMPS  is 2.2V.

So if your application requires VDD=1.8 V and the SMPS, you need to use VOS2 or VOS3 or SVOS4 or SVOS5.

When your question is answered, please close this topic by choosing "Accept as Solution". This will help other users find that answer faster.

Kaouthar

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

vmartinm
Associate

Thank you very much @KDJEM.1, that's just what I understood.