Do all esp32 chips support external RAM? (IDFGH-11622)

[patryk-belka-wizzdev]

Answers checklist.

• [X] I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• [X] I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
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General issue report

Hi, I'm struggling with choosing the correct esp32 model for my project. I need a chip that supports Bluetooth Coded Phy with Long Range feature and external RAM. From my research, ESP32-H2 would be perfect, but I can not confirm according to the documentation if this chip supports external RAM. Looking at this: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/external-ram.html all esp32 chips support it, but the only detailed description I found was for the esp32-S3. Where can I find the information for other chips, especially the H2? In my project, I need to allocate about 8MB of memory, which would be possible only with an external RAM module.

Thank You for your help

[ESP-Marius]

The page you linked to is for ESP32, but as in the chip ESP32. So when we talk about ESP32 we do not mean all ESP32-X chips, (ESP32-C3, H2++), just the ESP32 itself.

For info like this I would recommend using the product selector which lets you give your requirements and it will show you which Espressif chips that fits them.

Where can I find the information for other chips, especially the H2?

If you want check this info for a specific chip then the datasheet is the place to look: https://www.espressif.com/sites/default/files/documentation/esp32-h2_datasheet_en.pdf

ESP32-H2 do not support external ram, so if you need Bluetooth Coded Phy with Long Range feature + external RAM then maybe you could take a look at ESP32-S3, which support both.