What is the relationship between USBDPU and STM_USBDP in this schematic diagram?

Hardware design

August 06, 2020 by Jaydon 469

What does this mean? What is the relationship between USBDPU and STM_USBDP? ?

All Comments

Mekhi Posted on August 6, 2020

Probably, when PC8 (USBDPU) of U7 outputs low level, give STM_USBDP a 1.5k pull-up resistor, otherwise it is left floating.

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Kaya Posted on August 6, 2020

I simulated it with Multisim, but I still don’t understand STM_USBDP and STM_USBDM, which are obviously a set of differential USB signals. Why do I need this USBDPU to control the floating or pull-up?

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Javon Posted on August 6, 2020

Plug in the device and self-check the start of the handshake between the host and the device. And signal conversion from 3.3V to 5V.

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