this post was submitted on 06 Aug 2024
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ESP32

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A die shot of an ESP32 (upload.wikimedia.org)
submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]
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Source: https://commons.wikimedia.org/wiki/File:ESP32-Dieshot.jpg

It's interesting how they are able to fit some much in a small space ~~considering most of it appears to be memory~~.

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[–] [email protected] 6 points 3 months ago (1 children)

What are the octagons?

[–] duckythescientist 7 points 3 months ago (1 children)

Inductors! They are being used for the RF stuffs (and maybe some clock PLLs).

[–] [email protected] 2 points 3 months ago

Had no idea you could put inductors ON the die, but in hindsight, I guess there's no reason why not.

~8.5mm^2 of pure magic as far as I'm concerned.

[–] duckythescientist 5 points 3 months ago (1 children)

Most of it appears to be an upper metal layer. You can't tell that that's memory from this view.

[–] [email protected] 1 points 3 months ago

Interesting. I guess I assumed it was memory given how consistent it was. Thanks for clarifying.

[–] [email protected] 3 points 3 months ago

A dude who took a similar picture also has some more pics where they removed the top layer of the RF circuit allowing you to look inside

https://electronupdate.blogspot.com/2018/08/espressif-esp32-teardown.html?m=1