Author Topic: Bare ESP32-WROOM-32D Chip Setup Schematic  (Read 1143 times)

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Offline AlwaysAbiaTopic starter

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Bare ESP32-WROOM-32D Chip Setup Schematic
« on: January 12, 2025, 11:06:44 am »
Hello, newbie to schematic/PCB design here.

I'm working on a project where I want to use a bare esp32 chip on a PCB, before this I've only ever used the dev board (This is my first time designing a PCB).

I can't seem to find any detailed guides on how to set the the bare chip up.

This is where I am so far (Refer to Pic.)

I would appreciate any and all tips you might have on how to go about getting the hang of this.

Things I am particularly interested in:
 - It seems there are a lot of different versions of identical components, like buttons for example, how should I choose which ones to use?
 - How do I set up the programming pins so it's not a headache later (even though I plan to set up OTA updates for the MCU)?
 - Any tips on the placement of decoupling caps.
 - Anything else you might have to add
 

Offline Smokey

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #1 on: January 12, 2025, 12:16:36 pm »
That is not the bare chip. that's the SoM. 

Bare chip:
https://www.digikey.com/en/products/detail/espressif-systems/ESP32-D0WD-V3/11657616

SoM:
https://www.digikey.com/en/products/detail/espressif-systems/ESP32-WROOM-32E-N4/11613125


The ESP32-WROOM-32D you listed is not recommended for new designs.  If you want to use the original ESP32, use one that is active.

If you want to make your own board and don't know how to set up stuff, find another design that has a schematic available and copy that. 
Like this:
https://www.sparkfun.com/sparkfun-thing-plus-esp32-wroom-usb-c.html
https://cdn.sparkfun.com/assets/5/9/7/4/1/SparkFun_Thing_Plus_ESP32-WROOM_C_schematic2.pdf
 
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Offline AlwaysAbiaTopic starter

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #2 on: January 12, 2025, 12:54:31 pm »
I see, considering this, I want to make my own PCB with an esp32 SoM on board.

Could you specify why exactly it is that the ESP32-WROOM-32D is not recommended for new designs and an example SoM that would be better for this case?

Also, the design you linked has a lot of components, I'm guessing that I should go through each of them and decide which of them I need to keep for my project.

Thanks for your response!

 

Offline Smokey

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #3 on: January 12, 2025, 01:00:39 pm »
You can see the status of the ESP32-WROOM-32D by putting that part number in digikey.  Not for new designs means the manufacturer is still making it but it's a warning that they are going to discontinue that part soon.

If it were me, I'd use the esp32-S3 for a new project.

Here is another sparkfun example:
https://www.sparkfun.com/sparkfun-thing-plus-esp32-s3.html
https://cdn.sparkfun.com/assets/5/e/6/5/0/SparkFun_Thing_Plus_ESP32-S3.pdf
 
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Offline tooki

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #4 on: January 12, 2025, 09:11:50 pm »
DigiKey doesn’t say anything about the ESP32-WROOM-32D being NRND. You have to visit the Espressif website to see that. The recommended version is the ESP32-WROOM-32E. With that said, I agree that I’d design a new product around the ESP32-S3 instead.

As for how to proceed: go to the Espressif website and look at the evaluation boards (“devkits”), for example ESP32-S3-DevKitC-1 for the S3 or ESP32-DevKitC for the original ESP32, or to vendors like Adafruit (for their ESP32 Feather series), Olimex, DFROBOT, etc. They all make similar evaluation boards (with various features) as open-source designs with full schematics, etc. available.

IMHO there’s no better way to get a good idea than to look at what the vendors themselves do. Study their designs and modify as needed.
 
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Offline Smokey

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #5 on: January 12, 2025, 11:52:35 pm »
DigiKey doesn’t say anything about the ESP32-WROOM-32D being NRND. You have to visit the Espressif website to see that. The recommended version is the ESP32-WROOM-32E.
...
??  Type "ESP32-WROOM-32D" into digikey.  Click the " rf transceiver modules and modems" category.

Of the 9 results, 1 is active but out of stock. 1 is obsolete.  And 7 are not recommended for new designs. 

Yes, the manufacture is the final word on this, but if you can't get them in distribution who cares what the manufacturer says about status.
 

Offline tooki

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Re: Bare ESP32-WROOM-32D Chip Setup Schematic
« Reply #6 on: January 18, 2025, 05:01:49 pm »
DigiKey doesn’t say anything about the ESP32-WROOM-32D being NRND. You have to visit the Espressif website to see that. The recommended version is the ESP32-WROOM-32E.
...
??  Type "ESP32-WROOM-32D" into digikey.  Click the " rf transceiver modules and modems" category.

Of the 9 results, 1 is active but out of stock. 1 is obsolete.  And 7 are not recommended for new designs. 

Yes, the manufacture is the final word on this, but if you can't get them in distribution who cares what the manufacturer says about status.
I don’t know what to tell you: I did do a DigiKey search at the time I wrote, and it didn’t come up as NRND. Right now I’m seeing the same as you.

Either way it’d be silly to go with the -32D when the -32E are significantly cheaper!
 
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