TPS65982: What is the best 0x29 Control Configuration register (and maybe 0x28 one's) settings to be able starting as SNK to deal with different devices?

Yevhen Horbenko

Part Number: TPS65982

Hello guys,

thaks for your support.

My developing board is always starting as SNK to be powered both by charger and e.g. dual Power Role MacBook. And only if some conditions are met the board can become SRC to supply e.g. the MacBook.

I can't to test now next case but I think I'll have some issues. So the case: in addition to the listed devices I wish the board to deal with e.g. Type-C legacy flash drives or PD no dual-role devices which can't be SRC.

I suppose last two device kinds wouldn't negotiate at all.

So how to detect them properly to switch Power Role further?

over 5 years ago

0 Yevhen Horbenko over 5 years ago

Intellectual 510 points

Now the settings are:

0x28:

0x29:

0 Prajith Cheerakkoda over 5 years ago in reply to Yevhen Horbenko

TI__Expert 8680 points

Hi,

Could you try "Toggles R_p/R_d on CC (not try.src), supports data/power role swap"?

Tnx

Prajith

0 Yevhen Horbenko over 5 years ago in reply to Prajith Cheerakkoda

Intellectual 510 points

Yes, I'll try.

Should I also enable ProcessSwapToSource? (ProcessSwapToSink and InitiateSwapToSink have been already enabled and InitiateSwapToSink is disabling by my software before every SWSr)

0 Prajith Cheerakkoda over 5 years ago in reply to Yevhen Horbenko

TI__Expert 8680 points

Hi,

Your previous setting "Present Rd on CC" configures controller to come up only as sink. Thats why legacy devices did not work.

I would recommend you to go through https://www.ti.com/lit/an/slva843a/slva843a.pdf?ts=1591253673343 for more details.

Please click "This resolved my issue" button if I answered your query.

Thanks

Prajith

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TPS65982: What is the best 0x29 Control Configuration register (and maybe 0x28 one's) settings to be able starting as SNK to deal with different devices?