TUSB2036: Unused DM/DP pin

Kuramochi Tadahiko

Guru 28715 points

Part Number: TUSB2036

Hi,

How should unused DM/DP pins be terminated?

And could you review my customer's schematic?

Best Regards,

Kuramochi

over 5 years ago

0 Brian Zhou over 5 years ago

TI__Guru*** 145480 points

you can just leave unused DP/DM floating., sure we can help review schematic.

0 Kuramochi Tadahiko over 5 years ago in reply to Brian Zhou

Guru 28715 points

Brian-san,

Thank you for your support.

Could you accept my friend request?

Best Regards,

Kuramochj

0 Brian Zhou over 5 years ago in reply to Kuramochi Tadahiko

TI__Guru*** 145480 points

yes, I acceptted

0 Kuramochi Tadahiko over 5 years ago in reply to Brian Zhou

Guru 28715 points

Brian-san,

I sent schematic on private message.

Could you check it?

Best Regards,

Kuramochi

0 JMMN over 5 years ago in reply to Kuramochi Tadahiko

TI__Guru 60870 points

Hello Kuramochi-san,

Actually since the TUSB2036 is one of the older FS hubs, it is recommend that DP/DM of unused port be pulled low. This is not necessary with the newer HS hubs.

Regards,

JMMN

0 Kuramochi Tadahiko over 5 years ago in reply to JMMN

Guru 28715 points

JMMN-san,

Thank you for your comment.

Does it mean that "you can just leave unused DP/DM floating" is wrong?

Best Regards,

Kuramochi

0 Brian Zhou over 5 years ago in reply to Kuramochi Tadahiko

TI__Guru*** 145480 points

Kuramochi-san:

your schematic looks good. I saw DP/DM3 is pulled low.

Regards,

Brian

0 Kuramochi Tadahiko over 5 years ago in reply to Brian Zhou

Guru 28715 points

Brian-san,

DP/DM3 is pulled-up on the schematic.

Should they be not floating but pulled-down?

Best Regards,

Kuramochi

0 Brian Zhou over 5 years ago in reply to Kuramochi Tadahiko

TI__Guru*** 145480 points

0 Kuramochi Tadahiko over 5 years ago in reply to Kuramochi Tadahiko

Guru 28715 points

Brian-san,

I apologize my misunderstood.

Could you eliminate the picture because this is customer's one?

Best Regards,

Kuramochi

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TUSB2036: Unused DM/DP pin