Kajoj Personal Website http://kajoj.com/ Kajoj Personal Website Hugo -- gohugo.ioenkarol@kajoj.com (Karol) karol@kajoj.com (Karol)Wed, 30 Apr 2025 19:33:31 +0200 How to connect USB-C for your PCB board - 5.1k resistors http://kajoj.com/posts/usb-c-resistor/ Wed, 30 Apr 2025 19:33:31 +0200 Karol http://kajoj.com/posts/usb-c-resistor/ How important are two 5.1 kΩ resistors on USB-C? Let’s explain

USB-C is currently the standard in the electronics world – universal, reversible, capable of transmitting both data and power. However, for a device to properly draw current from a USB-C port, two 5.1 kΩ resistors connected to the CC (Configuration Channel) lines are essential. Why are they so important and what happens if they’re missing? Let’s find out.

Note
This article doesn’t touch on the topic of using USB C to get more power by negotiating higher voltage. This is more complicated topic. For that you will need to use a USB-C power delivery (PD) controller IC.

What do 5.1 kΩ resistors do on CC lines?

In the USB-C connector, there are two CC lines: CC1 and CC2. Their main functions are:

]]> How this site is built http://kajoj.com/posts/02.this_site/ Tue, 18 Mar 2025 13:14:31 +0100 Karol http://kajoj.com/posts/02.this_site/ How this site works

This site is built using Hugo, a static site generator written in Go. So I can host this website free with Cloudflare Pages and easily move to another solution if needed.

I also use Cloudflare CDN (built in Cloudflare Pages) and DNS. Build process is automated with Cloudflare Pages. Maybe I will back to build in GitHub Actions.

Whole source code is kept on GitHub: https://github.com/kajoj2/kajoj.com

]]> First Post http://kajoj.com/posts/01.first_post/ Sun, 25 Dec 2022 19:32:55 +0100 Karol http://kajoj.com/posts/01.first_post/ HELLO WORLD]]>