OSD335x-BAS USB questions
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- This topic has 4 replies, 2 voices, and was last updated 3 years, 8 months ago by
Sisko.
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- March 14, 2021 at 1:15 pm #11355
We’re currently designign a OSD335x-BAS-based board where only USB0 is used as device-USB. Here two questions came up:
– can I leave all the seven USB1_xxx-pins open or do some of them need to be pulled to a specific level?
– how about USB0_VBUS – where connect it to? Directly to 5V input of the USB connector?
Thanks 🙂
- March 16, 2021 at 1:25 pm #11364
We would recommend that you refer to the OSD335x Design Tutorial Application Note. Specifically, there is a section on USB:
Please let us know if you have any additional questions.
- March 17, 2021 at 6:40 am #11367
Hello Eirk,
thank yo ufor your feedback. These pages perfectly describe how to configure the USB-interface when it has to be used. But my question is what to do with the USB-pins when the related USB-port will NOT be used! Can I simply leave the related pins open or is it recommended to set them to some specific levels?
Thank you
- March 17, 2021 at 10:21 am #11369
Thanks for pointing out that the application note does not address how to connect the pins when not in use. We’ll make sure to update the application note in the future.
To answer your question, when not in use:
- USBx_DM, USBx_DP, USBx_ID, and USBx_VBUS may be connected to ground or left floating
- USBx_CE should be left floating
- USBx_DRVVBUS may be left floating or may be used for the alternate GPIO function (see Table 4-2 in the AM3358 datasheet for more information)
Please let us know if you have any additional questions.
- March 18, 2021 at 12:53 am #11372
Great, thank you!
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