To implement a USB 2.0 interface on a Type C connection, just add D+ & D- to the power connections. This is solved by increasing the number from pins in the USB connector from 4 to 9. To supply more power, you need more copper in your cable. USB 3.0 extends this to 900mA for all ports. This will protect from shorted cables and other issues. You can implement this using a PTC or similar device. USB 2.0 dictates that no device should be able to consume more than 500mA, so the Host should not offer more current than this. These current limits are set in the USB specifications. By setting up resistors on the CC-lines and detecting capabilities at the Host, you may also be able to request both 1500mA and 3000mA. if you plug it into a USB 3.X port using a USB 3 cable.
This will give you 500mA of power if you plug the other end of the cable into an old machine with USB 2.0, or up to 900mA. If you need to supply power to something simple like a microcontroller and some low power sensors, you can just tap into the GND and VBUS pins. These extra pins allow the higher speeds and extra power transfer.īelow is the pins of a USB C port on a master device such as your computer or a hub: USB C pinout (CC-by-SA 4.0, )Īs you can see, there’s 24 pins in the receptacle, but you don’t need to use all of them. The (typically) Blue USB 3.0 port on the left has 5 extra contacts in front of the normal 4 pins, giving this port a total of 9 connections. In the picture above, you can see that the USB 2.0 port has only 4 metal pins inside. Here’s my notes in the form of a short USB primer for anyone adding USB Type C to their projects. Looking at the standards, it’s not hard to implement a Type C interface, but it’s harder to get Superspeed to work reliably. Up until 2019, I only used USB 2.0 in my circuit designs, but for a customer project I had to implement a USB 3.1 Superspeed device using a Type C connector.
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