Is the high power-on current on the STM32H747XIH6 due to an error in the schematic?

[Zhangyonhai]

Post edited by ST moderator: This post has been translated from Chinese to comply with the ST Community guidelines.

Please use English language as it's an international community and to let others to understand your post. Thank you for your understanding.

[Peter BENSCH]

Welcome @Zhangyonhai, to the community!

When posting schematics, you should bear in mind that someone will need to review them within a reasonable amount of time. Light blue and light yellow text on a white background is practically impossible to read. And if you have also omitted all connecting lines and the person trying to help has to click on every connection to see where it leads, their enthusiasm for helping you will quickly dwindle to nothing.

However, since you have not provided any further information apart from the practically illegible schematics, the only possible answer to your question as to whether a high inrush current is attributable to the circuit is:

• either the circuit
• or incorrect installation of the devices
• or short circuits

Regards
/Peter

[TDK]

> Is the high power-on current on the STM32H747XIH6 due to an error in the schematic?

It sure is.

VCAP should not be tied to 3.3 V. It should be bypassed to GND with a 2.2 uF capacitor. This is covered in the datasheet and the hardware design guide.

Datasheet - STM32H747xI/G - Dual 32-bit Arm®Cortex®-M7 up to 480MHz and -M4 MCUs, up to 2MB flash, 1MB RAM, 46 com. and analog interfaces, SMPS, DSI

Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development - Application note

 

Could be other issues as well. I stopped there.

 

Also +1 to what @Peter BENSCH says above. This is the least readable schematic I have ever seen, and I've seen quite a few.