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I can't find the purpose of IC ( which is power sourced by VConn) inside the EMCA. Source/Sink can communicate with EMCA via this IC. But what is exactly function of this IC in Power Delivery ?

P/S: IC means : Integrated Circuit inside EMCA( Electronics Mark Cable Assembly - a type of cable which complies with Type-C connector). This IC is powered by Vconn signal.

Thank you!

son nguyen
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    Please try to make it easy for people to answer your question by giving some context. Are you talking about a USB-C cable? Which IC? Do you have any links at all? – BeB00 Mar 05 '18 at 03:56
  • It would be helpful if you provided some links. – BeB00 Mar 05 '18 at 04:04
  • Have you tried searching "Electronically Marked Cable Assemblies" on your favorite search engine? I think you will find some helpful results. – uint128_t Mar 05 '18 at 04:06
  • Oh...I found it, thank you very much for your guidance. I will add the answer for anyone , who need it. – son nguyen Mar 05 '18 at 04:12

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I found the answer for my question: Do all USB Type C cables support full power delivery

In order for a USB-PD compliant source to advertise capabilities greater than 3A (or up to the full 5A limit of the spec) the Type-C cable must be an Electronically Marked Cable Assembly (EMCA) and support SOP' packets. It must respond to the "Discover Identity" VDM sequence (USB-PD spec section 6.4.4.3.1) with a cable VDO packet with bits 6..5 set to indicate 5A current handling capability.

son nguyen
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