STM32F205 USB Termination

valentin · ‎2016-10-02

Posted on October 02, 2016 at 21:41

Hi everyone,

as I just found [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32L476%20USB%20Termination&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=119]here that the internal USB PHY contains the required 22R series resistors, I was wondering, whether that's generally the case for the STM32 family?

The reason I'm asking is that I couldn't find any such notes in the STM32F205 datasheet.

In there, the USB electrical characteristics only give numbers on pullup and pulldown values, which I assume are there to replace the external ones (15K for host, 1K5 for slave mode)?

I'm referring to Table 57. USB OTG FS DC electrical characteristics in the STM32F205 Datasheet.

Amel NASRI · ‎2016-10-31

Posted on October 31, 2016 at 11:27

Hi Valentin,

There is no need to add external resistors for USB lines in STM32F205 devices (like L4).

-Mayla-

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valentin · ‎2016-10-31

Posted on October 31, 2016 at 20:35

Thanks. Much appreciated!