TPS65987DDJ: TPS65987DDJ configuration regiest setting for voltage swap

Hi Nathan,

Would you first be able to tell me what system this will be going into? Is this being designed into a Thunderbolt platform or a monitor?

Hi Adam,

We support the dual role port(prefers power source) , DP mode and don't support thunderbolt.

We want to change PDO profile setting from PDO2 20V to PDO3 12V on S5 states from EC.

How about the modify rule and register on TPS65987DDJ ? 

Regards,

Nathan

Hi Sir,

After Hand-Shake Process,Our customer Want to change the Voltage 20V-->5V or 12V,

How should we through I2C register to change voltage?

Hugo

Hello,

First, the TPS65987DDJ is only intended for Thunderbolt applications and monitors. Since your system is neither of these, you must use the TPS65987D.

As far as changing the source voltage, is there a specific reason why they are wanting to change from a high voltage contract to 5V or 12V?

Hi Adam,

Please check following information.

DRP, sink configuration,

PDO1-

Operating 0.9A

Fixed 5V

Fixed sink

Maximum 3A

Minimum 0.9A

PDO2-

Operating 0.9A

Minimum voltage 5V

Maximum voltage 20V

Variable sink

Maximum 3A

Minimum 0.9A

Power voltage currently :

System on : VBUS =5V(negotiate)->20V

System off : VBUS =20V

Target power voltage:

System on : VBUS = 5V(negotiate)->20V

System off : VBUS = changed from 20V to 12V

Reason : for more power saving while system off

Question : If we need to create PDO3 for maximum =12V?

If yes, how to change the PDO#?

Regards,

Nathan

Hi Adam,

Thanks for your suggestion.

There are some questions after study app note.

What kind of Mapped Event setting for GPIO4 ?

And our transmit sink capabilities table as below.

Please help double confirm it.

When the GPIO event is high that transmit sink capabilities is 12V.

When the GPIO event is low that transmit sink capabilities is 20V.

Hi Adam,

Our system is notebook and sink only.

The power is supplied by a thirty party Type-C adapter( 5V, 9V, 12V , 20V ).

We want to change the supplied power voltage from 20V to 12V when system in light loading.

Please show us the setting example.

Thanks.

Nathan

Then you can use the PWR DUO Sink configuration template as an example. Please refer to my previous post, but instead of clicking TIDA-050012 Source Board, you would click on TIDA-050012 Sink Board.

You would the virtual devices to advertise its sink capabilities of going up to 12V

Hi Adam,

I have referenced the TIDA-050014 Sink board design example and completed the swap voltage function (from 20V to 12V).

We used  GPIO14 to trigger event signal from LOW to HIGH and created one virtual devices to advertise its sink capabilities of going up to 12V.

We have some question for the examples of the TIDA-050014 Sink board design.

1. After the function completed for swap voltage from 20V to 12V.

    Can we use the same GPIO14 to reduction swap voltage from 12V to 20V (trigger event from HIGH to LOW)?

Hi Adam,

[/quote]

Nathan

Regards,

Hi Adam,

We want to used one GPIO to swap voltage from 20V to 12V and reduction from 12V to 20V.

Function status as below:

1. GPIO14 --> set internal pull down --> Mapped event port 1 load app config 1 event "App Config Mask GPIO LOW Transition or User AM Exit" --> Mapped virtual device 1 (0x2)  <<<  20V ->12V function ready

2. Set GPIO14 Mapped event , port 1 load app config 1 event "App Config Mask, GPIO HIGH Transition or User AM Exit" --> Mapped virtual device 1 (0x8)  <<<  12V ->20V  The system can't power on.

Nathan

Would you be able to elaborate on what you mean by "system can't power on"? Are you not able to charge at the 20V, or does nothing happen when you make the GPIO high transition?

Also what is the state the system is in before you make the GPIO High transition? Is the charger already attached and you are wanting the PD controller to negotiate a higher voltage?

Hi Adam,

We have two test result.
Test A
(App Config Mask GPIO LOW Transition or User AM Exit --> Mapped virtual device 1 (0x2)) 12V
(App Config Mask, GPIO HIGH Transition or User AM Exit --> 0x0 )
Step 1. flash new PD FW and plug-in type-C adapter to power on the system.
Step 2. The GPIO14 "internal pull down" and make the GPIO14 signal from low to high from EC that the PD can swap voltage from 20V to 12V.
Step 3. When the PD out voltage is 12V and make the GPIO14 signal from low to high from EC that nothing happen the PD output still is 12V.

We want the voltage to return to its original state of 20V.

Test B
(App Config Mask GPIO LOW Transition or User AM Exit --> Mapped virtual device 1 (0x2))12V
(App Config Mask, GPIO HIGH Transition or User AM Exit" --> Mapped virtual device 2 (0x8))20V
Step 1. flash new PD FW and plug-in type-C adapter to power on the system.
Step 2. The PD controller The PD controller has no output voltage.

So Can we switch the ouput voltage of the PD controlle from 20 -> 12 -> 20 to use a GPIO ?

Regards,
Nathan

Hi Adam,

Yes, I have used a separate GPIO for each event and follow the sink power duo board setting. but still have some question.
1. When only one set of events (The PD default 20v output when system power on. Set event to GPIO14 to get 12V output). --> The function ok.
2. To add a second group of events (The PD default 20v output when system power on).
set the GPIO14 for 12V output.
set the GPIO15 for 20V output.
The PD 65987DDH do nothing. The VBUS is keep 5V.

Do you have any suggestions for us to check for PD FW setting.

Regards,
Nathan