Public

Thread: Unused pad

5 Discord messages from ℹ️ - Information/⁉️-questions/threads/unused-pad.md.

Category: ℹ️ - Information Parent channel: #⁉️-questions Thread ID: 1444908337236803715

Messages: 5

message-1444908337236803715

2025-12-01T04:29:52.696+00:00 — Evansika (@xintingjiang_36756)

Content

Hi all,
When using the gf180mcuD padframe template, what’s the recommended way to handle unused pads? Should I keep the pad cells in place to maintain a complete pad ring, and configure the unused signal pads as inputs with a weak pull-down (or another default) while leaving them unbonded/unconnected?

Thanks!
<details> <summary>Other message metadata</summary>
{
  "author": {
    "avatarUrl": "2025-12_media/079dacdd621abb17caecd8882513a32e-13E97.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
</details>

message-1444913752901288029

2025-12-01T04:51:23.891+00:00 — LukeW (@luke_w)

Content

If you want to be bond-compatible with the COB design then you need to keep the same number of pads on each edge, and keep all of the VDD and VSS pads in the same locations
<details> <summary>Other message metadata</summary>
{
  "author": {
    "avatarUrl": "2025-12_media/a2f98861602ee8229f4eb87d5c25d1b1-5FBF4.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
</details>

message-1444913954198655016

2025-12-01T04:52:11.884+00:00 — LukeW (@luke_w)

Content

Yes I'd recommend a pull-down, otherwise pads can float up to mid rail and start drawing current. The pulls are pretty weak, like 100k or so.

Reactions

<details> <summary>Reactions data</summary>
[
  {
    "count": 3,
    "emoji": {
      "code": "thumbsup",
      "id": "",
      "imageUrl": "2025-12_media/1f44d-27259.svg",
      "isAnimated": false,
      "name": "👍"
    },
    "users": [
      {
        "avatarUrl": "2025-12_media/3c7c17f3225f6e56f4dccd83f14383f2-73F83.png",
        "color": null,
        "discriminator": "0000",
        "id": "323371864074485771",
        "isBot": false,
        "name": "mole99",
        "nickname": "mole99"
      },
      {
        "avatarUrl": "2025-12_media/f2ec4a3c78aa64de4ebf8efb563cc011-91657.png",
        "color": null,
        "discriminator": "0000",
        "id": "538398807986274304",
        "isBot": false,
        "name": "rzioma",
        "nickname": "ReJ aka Renaldas Zioma"
      },
      {
        "avatarUrl": "2025-12_media/079dacdd621abb17caecd8882513a32e-13E97.png",
        "color": null,
        "discriminator": "0000",
        "id": "1413605821430104114",
        "isBot": false,
        "name": "xintingjiang_36756",
        "nickname": "Evansika"
      }
    ]
  }
]
</details><details> <summary>Other message metadata</summary>
{
  "author": {
    "avatarUrl": "2025-12_media/a2f98861602ee8229f4eb87d5c25d1b1-5FBF4.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
</details>

message-1444948304340455474

2025-12-01T07:08:41.596+00:00 — Evansika (@xintingjiang_36756)

Content

So that would be using input digital pad; gf180mcu_fd_io__in_c and set PD=1 PU=0?
<details> <summary>Other message metadata</summary>
{
  "author": {
    "avatarUrl": "2025-12_media/079dacdd621abb17caecd8882513a32e-13E97.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
</details>

message-1445058652229599375

2025-12-01T14:27:10.583+00:00 — LukeW (@luke_w)

Content

That works, or using the bidi with `IE = OE = 0` would work too
<details> <summary>Other message metadata</summary>
{
  "author": {
    "avatarUrl": "2025-12_media/a2f98861602ee8229f4eb87d5c25d1b1-5FBF4.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
</details>