Can I delete pins 17-22 from the wroom-32d footprint?

locustcox
Posts: 12
Joined: Tue Sep 04, 2018 9:36 pm

Can I delete pins 17-22 from the wroom-32d footprint?

Postby locustcox » Mon Apr 20, 2020 7:07 pm

Is there any issue with deleting pins 17-22 from the footprint and routing traces under them (protected by soldermaks, of course)? See attached screenshot.
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Screenshot from 2020-04-20 15-05-29.png
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Screenshot from 2020-04-20 15-05-29.png (459.84 KiB) Viewed 1773 times

mikemoy
Posts: 482
Joined: Fri Jan 12, 2018 9:10 pm

Re: Can I delete pins 17-22 from the wroom-32d footprint?

Postby mikemoy » Tue Apr 21, 2020 3:16 am

You can, but why not just use traces to the bottom side.

ESP_Sprite
Posts: 4011
Joined: Thu Nov 26, 2015 4:08 am

Re: Can I delete pins 17-22 from the wroom-32d footprint?

Postby ESP_Sprite » Tue Apr 21, 2020 7:47 am

Also, do note that those pins are connected to the flash and as such have signals with fairly low slew rates on them: you may get some capacitive coupling if all that separates them from your traces is a solder mask. If any, you can 'thicken' the layer by also putting a square of silkscreen between the pads and traces; that should also lower the risk of a solder mask failure causing a short.

mikemoy
Posts: 482
Joined: Fri Jan 12, 2018 9:10 pm

Re: Can I delete pins 17-22 from the wroom-32d footprint?

Postby mikemoy » Tue Apr 21, 2020 12:45 pm

@ ESP_Sprite, Excellent idea!

locustcox
Posts: 12
Joined: Tue Sep 04, 2018 9:36 pm

Re: Can I delete pins 17-22 from the wroom-32d footprint?

Postby locustcox » Tue Apr 21, 2020 7:53 pm

@mikemoy, mainly to reduce vias for some high-frequency rmii signals.

@ESP_Sprite, thanks for the tip, that is an excellent idea.

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