• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 134 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TPS65987D: Entering Sleep Mode via I2C

TPS65987D: Going to sleep with a cable connected

Chris Smith
Intellectual 825 points

Part Number: TPS65987D

Hi, 

Is there any way to get the TPS interface chip to sleep with a USB-C cable connected?  I'm open to external measures because I understand this is not the normal mode of operation.  

We have a situation where an external battery pack will be plugged in and is supposed to provide many days of power.  The possible scenario I could see is our micro wakes the TPS interface up when our internal battery gets low.  At that point the TPS connects to the external battery, negotiates power, the system charges for a bit, and then is commanded back to sleep.

We would need to do this because the standby current for the external battery and for TPS chip are just too high.  

Perhaps a FET on the Vbus line from the USB-C connector going into the TPS might achieve this?

C

  • 0
    TI__Mastermind 30000 points

    Hi Chris,

    You can configure the sleep capabilities of the TPS65987D using register 0x70. How the device operates today is that it can enter into a low power state even if a cable is connected. If there is no PD negotiation done for a period of time, the TPS65987D will enter into a low power state.

    Will you also want to limit the amount of current supplied to the connected device?