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USB EZ-PD Type-C

MaP_4480101
New Contributor

I have a USB-C peripheral device that will act as a charger for a mobile phone or laptop. The peripheral requires a modest amount of power (e.g., much lower power than what it delivers to the connected device) to operate. In the interest of keeping a single connector design and eliminating the need for a battery on the peripheral, is it possible to source and sink power simultaneously through a USB-C DRP port? If not, is it possible to tap off VCONN for peripheral bias?

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MaP_4480101
New Contributor

Hi Lisa,

Thanks for the quick response and ref. design links.

While both of the links demonstrate the capability of using the CCG3PA for DRP applications (both source/sink through a USB-C port), I don't believe either discuss using the port as a source AND sink at the same time.

The south chip link clearly states that the "portable external battery ... stores charge when connected to a charger and later delivers charge to an attached device".

The Qorvo link looks more promising (perhaps the USB PD controller can manage what I am looking for) but it is not clear to me whether bidirectional, simultaneous power paths are possible.

To return to my original question, it seems that VCONN, can be used as a supply to the peripheral after the CC has identified polarity. See the following link: https://www.silabs.com/community/mcu/8-bit/knowledge-base.entry.html/2016/09/26/what_s_the_role_ofc-..., number 2.

It seems in either role, the host device should be capable of providing a small amount of power to the peripheral.

Thoughts?

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MaP_4480101
New Contributor

Ping.

Can anyone confirm that the I/F can be configured so the PD sink can be the VCONN source?

Thank you.

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ShifangZ_26
Moderator
Moderator

Hi ,

VCONN SPEC is below:

pastedImage_1.png

If your design support VCONN, you can follow this SPEC. And CCG3PA can support it with external MOS FETs.

Best Regards,

Lisa

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