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Schematic check

Starman
Associate II

‎2023-02-20 12:45 PM

I'm learning how to make a PCB with an STM32H725IGK6 MCU (UFBGA), which will be used as a flight controller for a drone. This is the first proper attempt I've done at creating a schematic, so I would appreciate it if someone more experienced would be able to look over it and give any feedback or spot any obvious electrical errors.

Thanks for your time.

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Piranha
Chief II

‎2023-02-20 5:38 PM

  • Put a 100 nF capacitor from NRST to GND.
  • I see +BATT line at U3, but at no other part.
  • Not sure about the necessity of D6.
  • For a simple power sinking device USB-C requires two 5,1k pull-down resistors on CC1/CC2 lines.
  • The LDO/SMPS related connections and VCAP capacitors seem to be wrong. Read the AN5419.
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Starman
Associate II
In response to Piranha

‎2023-03-05 4:08 PM

thanks for the response.

im struggling to understand what the datasheet is saying about the LDO/SMPS connections, and which combination i should use. ive replaced the 5v to 3v3 linear regulator with an SMPS instead (to reduce power loss). i am guessing that i should use External SMPS supply, supplies LDO, but even if this is correct the diagram confuses me and i dont really understand what it means. would you be able to point me in the right direction?

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