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Hardware design of USB in bus-powered app.

ksale.1
Senior

Hi,

Please note my hardware design background is weak. I'm confused between the design in AN4879 and the schematics of STM32H7xxx-Disco, as shown below. Your help is much appreciated.

0693W00000Uo7C9QAJ.png0693W00000Uo7CEQAZ.png

2 REPLIES 2
gbm
Lead II

The upper picture shows the simplified diagram of a bus-powered USB device; the bottom one - dual role host/device without device bus power capability (but capable of supplying the attached device when taking the host role).

ksale.1
Senior

Thank you @gbm​ , Please advise the attached schematic is good for USB_OTG_FS , Communication Device Class (Virtual Port Comm).

0693W00000UoKtkQAF.png2- In selection of a step-down converter, must the datasheet explicitly states in the Application "USB Power Supplies"?