TPS65987DDJ: Can't sink 5V/3A from source TBT port

Oden Chang

Prodigy 90 points

Part Number: TPS65987DDJ
Other Parts Discussed in Thread: TPD6S300A, TIDA-010047

Hi Sir,

We used the TPS65987DDJ for TBT device application(Titan ridge).

Our host side has 5V/3A PDO. Device side has 5V/3A sink capability.

Attached is our schematic:

TPS65987DDJ schematic.pdf

It's my first design for TBT & PD,and I have some question need your help.

I appreciate your help.

Q1: If I link TBT port from host to device, Device side's Vbus voltage is 0. And I check CC pin status is keep low when plug in the cable.

Do TPD6S300A pin4&7 and pin5&6 need to connect GND for battery dead boot? What item can I check next?

Q2: If CC pin has high-low level when plug in the cable and Vbus voltage is still 0. What item can I check first? Is my PD firmware setting problem or?

Q3: All power in the schematic is supplied through VBUS(5V/3A). Is it possibile do like TIDA-010047 PD Control board but used TPS65987DDJ?

If our schematic has some issue please let me know. Thanks!

Best regards,

Oden

over 3 years ago

0 Prem Vadapalli over 3 years ago

TI__Intellectual 1005 points

Can you confirm if you are following the Intel Tapex Creek reference design?

0 Jacob Ontiveros over 3 years ago

TI__Expert 6280 points

Hi Oden,

Did you get the clearance from Intel for this type of design? From the schematic this is fairly different from Tapex Creek. Tapex Creek is intended to be a self powered device.

Jacob

0 Oden Chang over 3 years ago

Prodigy 90 points

Hi Prem & Jacob,

Thanks for your reply.

We are trying to used TBT port's VBUS power(5V/3A) for all chip which is used on my design.

So it's not following the Intel Tapex Creek reference design.

Is it possibile to do what I want?

Best regards,

Oden

0 Jacob Ontiveros over 3 years ago in reply to Oden Chang

TI__Expert 6280 points

Hi Oden,

Do you have a block diagram to check the feasibility of what you are trying to do? From the schematic it is hard to see what you are trying to accomplish.

Jacob

0 Oden Chang over 3 years ago in reply to Jacob Ontiveros

Prodigy 90 points

Hi Jacob,

We just want to boot from no-battery conditions by receiving power from VBUS 5V/3A.

And I change R79 from 100K to 18K and U6 Pin 4、5、6、7 disconnected from GND.

Now I can sink 5V/3A from source TBT port and there is no question.

Thanks for your reply.

Oden

0 Jacob Ontiveros over 3 years ago in reply to Oden Chang

TI__Expert 6280 points

Hi Oden,

Okay that sounds good then. Just to inform you this was not tested on our end so there might be some unforeseen issues.

Jacob

Interface

Interface forum

TPS65987DDJ: Can't sink 5V/3A from source TBT port