Information on STM32F405 USB schematics

[cradoumis]

Posted on June 29, 2016 at 22:40

I am building a board using this MCU and I'm wondering where I can get some information on the USB schematics. Reading the data sheet somewhat helped, but didn't exactly answer my question. 

I would like the ability to power the board from USB, make programming / MCU changes from USB, and potentially use it as a peripheral device depending on whats plugged in.Does anyone have any insight on what that schematic would look like? Any help would be greatly appreciated. #smt32f405-usb

[slimen]

Posted on June 30, 2016 at 00:40

Hi, 

Try looking to this reference 

http://www.st.com/content/ccc/resource/technical/document/reference_manual/3d/6d/5a/66/b4/99/40/d4/DM00031020.pdf/files/DM00031020.pdf/jcr:content/translations/en.DM00031020.pdf

 and manual 

http://www.st.com/content/ccc/resource/technical/document/user_manual/b7/34/4d/b8/bc/ae/47/1f/DM00218846.pdf/files/DM00218846.pdf/jcr:content/translations/en.DM00218846.pdf

.Regards

[slimen]

Posted on June 30, 2016 at 12:20

Hi, 

You can refer to this manual

http://www.st.com/content/ccc/resource/technical/document/user_manual/98/2e/fa/4b/e0/82/43/b7/DM00105823.pdf/files/DM00105823.pdf/jcr:content/translations/en.DM00105823.pdf

 for STM32 Nucleo, it may be helpful.Regards

[cradoumis]

Posted on July 01, 2016 at 21:02

Thank you. With my minimal understanding of this mcu's power supply requirements, can someone take a look at the 2 schematics I put down to see if it will give me what I need?

Essentially, the ability to run power through USB (Either through a 5v wall charger, or PC) or a AA battery pack (I think I need 4 AA batteries?)So power is coming through from USB on vbus on the connector, then going to PB13 (34)Which also connects to the voltage regulators, there is a 5v and a 3.3v regulator with both vbus and the battery pack before the IN on the 5.0V regulator.I'm not sure if I have this correct. The AA batteries are not rechargeable so I need reverse current protection as well.Any help would be greatly appreciated.

[cradoumis]

Posted on July 04, 2016 at 00:36

Wondering if anyone has any insight into my question.

[cradoumis]

Posted on July 07, 2016 at 20:24

I think the schematic is correct, but I want to make sure before I connect this to a dev board and fry the MCU..

[Tesla DeLorean]

Posted on July 07, 2016 at 20:37

You look to have a bunch of stuff cross-connected on the VBUS net, check the netlist.

I'd probably use diodes when getting 5V from multiple sources. You have a miss-named net USB2_DP_VR that doesn't connect to anything. Run a DRC

[cradoumis]

Posted on July 07, 2016 at 21:21

http://i.stack.imgur.com/th7RK.png

http://i.stack.imgur.com/ohQej.pngThese two images should be easier to read.I forgot I had labels on some of the nets. Also I removed the 2nd USB since its not needed. I want USB programming but Ill deal with that later.