Definition: A chip embedded in USB-C cables that reports cable capabilities such as charging current, data rates, and vendor information.
Explanation
An eMarker chip is an electronic marker embedded within USB-C cables that communicates detailed information about the cable’s specifications to the host device. This includes supported charging currents, maximum data transfer rates, and manufacturer details. The chip enables devices and software to identify cable capabilities automatically, helping users understand what performance to expect from the cable.
However, the information provided by the eMarker chip is self-reported by the cable’s controller and may not always reflect real-world performance or reliability. It is important to verify cable performance through testing rather than relying solely on the eMarker data.
Example
Using a utility like WhatCable on a Mac, a user can read the eMarker chip data from a USB-C cable to see if it supports fast charging at 100W or USB 3.2 Gen 2 data speeds. This helps differentiate between cables that look identical but have different capabilities.
Who This Is For
This term is useful for technology enthusiasts, hardware engineers, IT professionals, and consumers who want to understand USB-C cable specifications and ensure they use cables that meet their device requirements.
Related Terms
USB-C, USB Power Delivery, USB descriptors, cable identification, data verification
Also Known As
electronic marker chip, USB-C eMarker