How to configure SMT32H755TUZIT6 physically for LDO ?

[mkel]

Hello all, currently if I want to turn my cpus to 480 MHz and 240 MHz, I have to switch to ldo, and voltage scale 0, rev v. Using the default SMPS will give only 400MHz, I tried 480MHz with the wrong scale, SMPS, and successfully debugged the M7 but the M4 got stucked on "waiting for debugger connection" forever (it didn't say no target found). In UM2408 table 10 section 7.4.8, switching to internal LDO only will require removing some soldier bridge and changing capacitor value. Does it mean I will have to physically do it according to the datasheet everytime not only for LDO but other peripherals too ? Thank you.

[TDK · Accepted solution]

SMT32H755TUZIT6 isn't a chip. STM32H755ZIT6 maybe?

Sounds like you're using a nucleo board. NUCLEO-H755ZI-Q maybe? Yes, you have to physically make the changes on the board to use LDO mode at 480 MHz according to the user manual. You have to do this one time, then you can set clock to 480 MHz and use LDO. This has nothing to do with what peripherals you're using.

Unable to connect to STM32H7 devices - STMicroelectronics Community

[mkel]

I just have 1 confusion: Why is it designed for different feature/peripheral we must modify/remove/add physically the sb, capacitors, resistors ? I got used to Arduino so this is quite new. Thank you for the answer, for now I will stick to SMPS 400MHZ max.