• Skip to main content
  • Skip to primary sidebar

RNTLab.com

The Ultimate Shortcut to Learn Electronics and Programming with Open Source Hardware and Software

  • Courses
  • Forum
    • Forum
    • Ask Question
  • Shop
  • Account
  • Blog
  • Login

Are GPIO outputs truly open-drain or are there ESD diodes to the supply rails?

Q&A Forum › Category: ESP32 › Are GPIO outputs truly open-drain or are there ESD diodes to the supply rails?
0 Vote Up Vote Down
Kent Walker asked 3 months ago
Question Tags: GPIO open-drain
2 Answers
0 Vote Up Vote Down
Sara Santos Staff answered 3 months ago

Hi.
I’m sorry for taking so long to answer your question. I missed your question.
 
To be honest, I’m not sure. The schematic diagrams of the boards are not clear about that. You can find the datasheet and schematic diagrams for some boards here: https://www.espressif.com/en/support/documents/technical-documents. Maybe you can find some useful information.
 
Is this a critical feature for your project?
 
Regards,
Sara

0 Vote Up Vote Down
Kent Walker answered 3 months ago

Hi Sara, thanks for your reply.  I’ve been through the datasheets and found nothing so far.
I was thinking of using an OC output to control a peripheral that was supplied by a Li-ion battery, which would be fine if the battery was low (ie under 3.3V) but not so wonderful if there are ESD diodes and the battery is charged.
To be safe, I’ve decided to use an external FET to control the peripheral instead

Primary Sidebar

Login to Ask or Answer Questions

This Forum is private and it’s only available for members enrolled in our Courses.

Login »

Latest Course Updates

  • [eBook Updated] Download Build Web Servers with ESP32 and ESP8266 (2nd Edition) February 8, 2021
  • [eBook Released] Build Web Servers with ESP32 and ESP8266 (version 1.0) October 27, 2020

You must be logged in to view this content.

Contact Support - Refunds - Privacy - Terms - MakerAdvisor.com - Member Login

Copyright © 2013-2021 · RandomNerdTutorials.com · All Rights Reserved