Hardware design of USB in bus-powered app.

ksale.1 · ‎2022-10-15

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.

gbm · ‎2022-10-15

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).

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice

ksale.1 · ‎2022-10-19

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

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