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TPS65987D: tablet PC of a specific manufacturer

R.Fukunaga
Expert 2445 points
Part Number: TPS65987D

Tool/software:

Hi all,

The following behavior can be seen when connecting a tablet PC of a specific manufacturer whose battery has been discharged.

VBUS output stops repeatedly

->Complete stop after a while

->The tablet PC cannot be charged

When my customer checked the signal,

they found that after CC1 terminal exchanges commands about 5 times, the CC1 voltage rises, and then the VBUS output stops.

Could you tell me what causes this behavior?

Best Regards,

Ryusuke

  • 0
    TI__Guru 63241 points

    Hello,

    There could be a number of reasons for the behavior.

    (1) VBUS drops because of the inrush of the dead battery condition.

    (2) Source is only sending source capabilities message 5 times and then stops sending.  If the PD on the PC is still 'booting', ie because of dead battery PD configuration was never loaded the PD will issue a reset because of sink timer timeout.

    (3) The system is not designed to support dead battery.

    You may want to confirm that the issue is not related to the source by attempting with different kinds of sources.

    Regards,

    Chris