TPS65987D: TPS65987D

Norbert Erhart

Part Number: TPS65987D

Hi!

I’m using the TPS65987D in an UFP application and I’m trying to solve the following task:

The application is using 5V supply only depending on the current (1.5A or 3.0A) the source can supply the application should act in two different ways.

What I did:

I defined 2 PDOs as shown in the picture “Define PDOs.jpg”

I configured GPIO #14 / GPIO #15 as shown in the picture “Config GPIO14_15.jpg”

GPIO #14 should get high if the source can provide 1.5 A only

GPIO #15 should get high if the source can provide 3.0 A

Results:

If I connect to a source with 5V/1.5A max GPIO #14 becomes high => O.K.

In Debug-Mode please see following pictures

“Received Source Capabilities_Source PDO 1_5V-1A5.jpg”

“Active Contract PDO 5V_1A5-Source.jpg”

If I connect to a source with 5V/3.0A max also GPIO #14 gets high BUT NOT GPIO #15

In Debug-Mode please see following pictures

“Received Source Capabilities_Source PDO 1_5V-3A0.jpg”

“Active Contract PDO 5V_3A0-Source.jpg”

Does anybody know why GPIO #15 is not getting high in case I connect to a 5V/3.0A Source?

If my above approach doesn't work at all, does anybody have an idea how to differentiate between 5V/1.5A and 5V/3.0A source capabilities?

Thank you very much!

Regards

Norbert

over 2 years ago

0 Kevin Kosta over 2 years ago

TI__Mastermind 18215 points

Hi Norbert,

Thanks for reaching out on E2E!

I am having trouble viewing the images you attached.

Can you please reattach the images in a zipped folders?

Can you also please attach your project file as well?

Looking forward to hearing back!

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hello Kevin,

thanks for your answer. Please find attached the pictures as a .zip file and the project file.

Screenshots_TPS65987D_UFP_5V-1A5-3A0_220926.zip

TPS65987D_UFP_5V-1A5-3A0_220926.pjt

BTW: I'm using the TPS65987EVM board for testing.

Thank you in advance!

Regards

Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hi Norbert,

Thank you for these!

Can you please check that open drain output enable is checked?

Do you have a PD analyzer? A PD analyzer will tell you exactly what PDO is negotiated!

Please let me know if this worked!

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hi Kevin,

unfortunately it didn't work and I also don't have a PDO analyzer available. According to the scrrenshots it always says "PDO 1"

During my evaluation I checked also a further set-up:

I took one TPS65987EVM and configured this as DFP (source) with PD0-0 as 5V and PDO-1 as 9V.

and I took a second TPS65987EVM and configured this as UFP (sink) with PDO-0 as 5V and PDO-1 as 9V. The GPIO-14 and GPIO-15 were configured the same way.

Result-I: If I connected this UFP to a notebook with 5V only the GPIO-14 was activated

Result-II: If I connected this UFP to the TPS65987EVM (source configuration) the PDO-1 (9V) was selected and the GPIO-15 was activated

Conclusion: It seems that if PDO-0 and PDO-1 have different voltages it seems to work, but if PDO-0 and PDO-1 have same voltage but only different max. currents it doesn't seem to work.

Thanks again and regards

Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hi Norbert,

Sorry that did not resolve your issue!

I have tried this multiple times with different voltages, but I have not even attempted to do it with different currents.

I took another look at your original .pjt. Can you try unchecking the Higher Capability checkbox and see if that changes anything?

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hi Kevin,

thanks for your prompt reply again. Well, I tried almost any possible configuration before I put my problem here in the support. Nevertheless I tried your suggestion again, but unfortunately without success. No matter if I have a DFP with max 1.5A or max 3.0 A, only GPIO14 is activated. Well I'm at a loss

Regards Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hey Norbert,

I will try and replicate this on my end if I get a chance.

I highly recommend getting a PD analyzer as it will decode all of the information when a PD negotiation is occurring.

That way you can tell exactly what is occurring.

Thank you,

Kevin

0 Kevin Kosta over 2 years ago in reply to Kevin Kosta

TI__Mastermind 18215 points

Hi Norbert,

Following up here!

I was able to confirm that I could get the two different contracts. I used the power duo source board to offer 5V @ 1A and 5V @ 3A contracts and confirmed that I could differentiate between the two of them.

I think that your source device might be the reason that you cannot see the difference.

Again I highly recommend getting a PD analyzer so that you can see exactly what is going on.

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hello Kevin,

thank you very much for your efforts!!

I have received a a PD analyzer yesterday and will set it up today.

What kind of source did you use? As mentioned in the begiijning I'm using 2 sets of TPS65987EVM boards, one as source and one as sink.

Thank you

Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hello Norbert,

Of course!

I actually used a the power-duo source board and programmed one button to offer 5V @1A and another button to offer 5V @ 3A as mentioned above.

https://www.ti.com/tool/USB-C-PD-DUO-EVM

Norbert Erhart said:
I have received a a PD analyzer yesterday and will set it up today.

Glad to hear! It will make life and debugging a lot easier!

Try setting once source contract at a time on the other TPS65987EVM and it should work!

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hello Kevin,

I saw, that the boards you use have the TPS65987D, too. Would it be possible to provide the project-files you used for 1.5A / 3A on your sink/source side?

Thank you again very much!

Norbert

0 Norbert Erhart over 2 years ago in reply to Norbert Erhart

Prodigy 60 points

Hello Kevin,

meanwhile I've the analyzer running. I have summarized some short results in the attached document.

Transmitted Sink Capabilities_221006.pdf

Thank you

Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hi Norbert,

Give me some time to look at these!

Thank you,

Kevin

0 Norbert Erhart over 2 years ago in reply to Kevin Kosta

Prodigy 60 points

Hi Kevin,

may I ask you, if you have had a chance to look at this problem again?

Thank you

Norbert

0 Kevin Kosta over 2 years ago in reply to Norbert Erhart

TI__Mastermind 18215 points

Hi Norbert,

Apologies as I have not had the time to work on this!

I will try to replicate soon, if not I will reassign to another team member to attempt!

Thank you,

Kevin

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TPS65987D: TPS65987D