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TPS65988: Received Sink and Source Capabilities of Application Customization Tool for TPS65988

Uchida Yasuhide
Prodigy 180 points
Part Number: TPS65988

I set source PDO "5V 3A" of TypeC2 side. but I read Active Contract PDO " 5V 0.9A".

I have questions about Application Customization Tool  for TPS65988.

When I read Debug Registers, we can get Received Sink and Source Capabilities of "Device1 port1" by Polling.

But I cannot get Received Sink and Source Capabilities of "Device1 port2" by Polling.

Might be Active Contract PDO 0.9A.

So I try "Get Sink and Source Capabilities" commands, then I can get Received Sink and Source Capabilities of "Device1 port2".

 But Active Contract PDO 0.9A.

Why we cannot get Received Sink and Source Capabilities of "Device1 port2" by Polling at first?

How to charge 5V 3A ?

 

  • 0
    TI__Intellectual 2370 points

    Hi Uchida,

    Your application is in Dead Batter mode, where PD is powered from Type-C 1; in this mode, we limit the output capacity on the second port, and only 5V/ 0.9A source PDO is permitted. 

    Do you have an MCU on your system? We may need that to help clear Dead Battery flag.

    Thanks.

    Bing

  • 0 in reply to Bing Hwang
    Prodigy 170 points

    Hi Bing,

    Thank you for your comment.

    I have a question. Do the first port(TypeC-1 sink) limit input capacity in Dead Battery mode ?

    My system have an MCU but I use PD controller in MCU power OFF mode.

    My system is connecting a input GPIO to the TPS65988 for detecting VBUS power supply.

    Could you tell me How to clear Dead Battery flag using GPIO ?

  • 0 in reply to Yasuhide Uchida
    TI__Intellectual 2370 points

    Hi Yasuhide,

    No, sink port won't be limited, only the source port will be limited to output power in Dead Battery mode.

    We don't map Dead Battery clear feature on any GPIO. Thus I recommend that you should power on MCU after sink port have connected to a power source, then use MCU to clear PD's Dead Battery flag by using 4CC command "DBfg" to PD through I2C.

    Thanks.

    Bing

  • +1 in reply to Bing Hwang
    Prodigy 170 points

    Thank you for your cooperation.