TPS65987D: Is there a way to signal (via GPIO) whether the part has detected a BC 1.2 adapter or not?

Mark Pearson

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65987,

One of my customer engineers has the following questions regarding our TPS65987:

We are using the TPS65987 for a USB PD application, and using GPIO outputs from the part to tell a processor which PDO is being utilized. However, we haven’t found a way to signal (via GPIO) whether the part has detected a BC 1.2 adapter or what are the current limits of the adapter. Specifically, we would like to know if the connected adapter/port is capable of >500mA source.

Do you know if this is possible? Any help you can provide would be appreciated.

Thoughts on this?

over 5 years ago

0 Eric Beljaars over 5 years ago

TI__Mastermind 36756 points

Hi Mark,

Below is a screenshot from the 87D Host Interface TRM document. It highlights the only GPIO Event that is tied to BC1.2 detection in the 87D:

I hope this can meet your customer's needs.

Thank you,
Eric

0 Mark Pearson over 5 years ago in reply to Eric Beljaars

TI__Genius 12705 points

Eric,

It appears this only works when acting as a source. Is that correct? We want to know the various current limits when using a BC 1.2 charger and acting as a sink.

Thanks, Mark

0 Eric Beljaars over 5 years ago in reply to Mark Pearson

TI__Mastermind 36756 points

Hi Mark,

That is correct. You would need to use an external microcontroller to read back the status register of the TPS65987D. The GPIOs do not deliver this level of information.

Thank you,
Eric

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TPS65987D: Is there a way to signal (via GPIO) whether the part has detected a BC 1.2 adapter or not?