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Original question:

TPS65982: Type-C USB PD Controller TPS65982 design for 12V,3A, Sink only application.

TPS65982: Can the CC pins will be multiplexed with UART signals through an Analog switch which is powered by 3.3V?

chethan md
Intellectual 860 points
Part Number: TPS65982

I am working on a new project wherein i am using TPS65982 for Sink only application with 20V@1.5A power profile requirement.

I am using a custom connector in my system instead of standard Type-C connector and planning to power this system by a Type-C power bank with 20V@1.5A profile. So cable will me custom made by us, one end towards power bank is standard Type-C plug, other end would be a custom side.

As i am using a custom connector and there is a constraint on number of pins, i am multiplexing CC1&CC2 with UART's TX&RX--so based on Mux selection either CC1&CC2 or TX&RX will pass through my 5 pin connector.

Question is:

Since the CC pins go up to 5V as per the spec, I will have a mux on my board which is powered by 3.3V--So do you think it will work?.

My confidence is

  1. after measuring the CC pins logic levels on TPS65982 EVM, i see until UFP attaches the swing will be 0-3.3V and after attach event itwill be from 0-1.65V. this means CC pins will swing from 0-3.3 or 0.165 on a TPS65982 DFP systems, however I am not sure about other Type-C PD controller systems.
  2. Also,As my board will be always a UFP and presents Rd on CC lines, at my device level CC pins will never go beyond 3.3V even DFP swings at 0 to 5V, hence i can have CC mux on my board with Mux being powered by 3.3V.

Please let me know if am making some sence, can i multiplex CC lines, and limit the swing to 3.3V at my device side?