ESP32-C3 not coming up if VCC below 3V.

bstolk
Posts: 23
Joined: Fri Jan 07, 2022 6:44 am

ESP32-C3 not coming up if VCC below 3V.

Postby bstolk » Sun Jun 23, 2024 6:58 pm

I am using the ESP32-C3 and I power it with two AA batteries on the Vcc pin.

Even though this works, I find that the ESP32-C3 will not operate under 3.0V.

Which I think is strange, because I have set the brown-out level at 2.51V in the sdkconfig of my IDF project. (See picture below.)

I also run the chip at 80MHz.

Why will the ESP32-C3 not run below 3.0V if the brown-out detector has been set to 2.51V?

Am I running this chip out-of-spec at this voltage level?
Attachments
Screenshot from 2024-06-23 11-51-23.png
Screenshot from 2024-06-23 11-51-23.png (15.05 KiB) Viewed 1500 times

ESP_Sprite
Posts: 9757
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-C3 not coming up if VCC below 3V.

Postby ESP_Sprite » Mon Jun 24, 2024 1:48 am

You might not run the ESP32C3 silicon itself out of spec, but you could be running the flash that is in the module or on-package out of spec. Additionally, non-rechargable AA batteries don't do super well with high current spikes, so you'd need a fair bit of extra capacitance to compensate for that. (Rechargable batteries are only 1.2V, two would make 2.4V and that certainly is out of bounds.)

Who is online

Users browsing this forum: No registered users and 110 guests