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Wi-Fi Combo

SeFe_4295646
New Contributor II

There are a few interfaces we're not using in our design.  Is there a list of what to do with unused inputs or I/O lines on SDIO, MII, S/PDIF, or USB interfaces?  Are they internally pulled to safe / idle states, or do they need to be manually strapped?  If they need to be tied, are resistors required or can we connect directly to VIO/GND?  I realize this may depend on the signal / interface signal, but a list of what to do with unused signals would be very helpful.

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1 Solution
Zhengbao_Zhang
Moderator
Moderator

Hello SeFe_4295646

I can't find a document to describe the unused I/O interface, since they are standard communication interface, normally,

we recommend:

  1. Input,    need a pull-up resistance to VIO.
  2. Output,  can be floating.
  3. I/O , we can configure them after chip reset .

if there have questions , please correct me, thanks.

View solution in original post

3 Replies
MichaelF_56
Moderator
Moderator

Note that I found a similar thread here: https://community.cypress.com/message/183272#183272

Maybe the Applications Team can confirm this is the correct approach for the unused pins.

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SeFe_4295646
New Contributor II

Ya seems that would apply, thanks for the find, didn't come up on my searches.  Will watch to see if there's confirmation.

0 Likes
Zhengbao_Zhang
Moderator
Moderator

Hello SeFe_4295646

I can't find a document to describe the unused I/O interface, since they are standard communication interface, normally,

we recommend:

  1. Input,    need a pull-up resistance to VIO.
  2. Output,  can be floating.
  3. I/O , we can configure them after chip reset .

if there have questions , please correct me, thanks.

View solution in original post