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Can I delete pins 17-22 from the wroom-32d footprint?
Posted: Mon Apr 20, 2020 7:07 pm
by locustcox
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.
Re: Can I delete pins 17-22 from the wroom-32d footprint?
Posted: Tue Apr 21, 2020 3:16 am
by mikemoy
You can, but why not just use traces to the bottom side.
Re: Can I delete pins 17-22 from the wroom-32d footprint?
Posted: Tue Apr 21, 2020 7:47 am
by ESP_Sprite
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.
Re: Can I delete pins 17-22 from the wroom-32d footprint?
Posted: Tue Apr 21, 2020 12:45 pm
by mikemoy
@ ESP_Sprite, Excellent idea!
Re: Can I delete pins 17-22 from the wroom-32d footprint?
Posted: Tue Apr 21, 2020 7:53 pm
by locustcox
@mikemoy, mainly to reduce vias for some high-frequency rmii signals.
@ESP_Sprite, thanks for the tip, that is an excellent idea.