• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 421 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.

TPS25750: TPS25750+BQ25792

SWENGWOO LEE
Intellectual 270 points
Part Number: TPS25750
Other Parts Discussed in Thread: BQ25792

HI
It seems that you are using TPS25750 and BQ25792 without an EEPROM, and while it functions well under normal circumstances,
if USB C is connected in the BQ25792 SHIP state, the product power is turned on, and USB C is removed and connected again, 

the TPS25750 cannot output PPHV. can i know the reason??
  • 0
    Intellectual 270 points 
    circuit diagram attached
  • 0 in reply to SWENGWOO LEE
    TI__Genius 15275 points

    Hi Swengwoo,

    Looking at your circuit diagram, your I2C lines between TPS25750 and BQ25792 are connected on the slave lines of TPS25750.

    How are you loading your configuration to TPS25750? How are you controlling your output voltage on the BQ25792? What are you trying to test, is this sourcing? Whenever you reconnect USB cable, what is your output voltage on BQ25792?

    Regards,

    Brandon

  • 0 in reply to Brandon Beader
    Intellectual 270 points

    HI

    It has been determined that the lack of PPHV output was due to the dead battery flag being set. However, when a regular charger is connected instead of a PD charger, the PPHV output is generated even when the dead battery flag is set.

    please tell me why it works like this

  • 0 in reply to SWENGWOO LEE
    TI__Genius 15275 points

    Hi Swengwoo,

    The TPS25750 will send the I2C events to BQ25792 to configure the charge voltage and current along with other register settings for charging. These commands are sent only when there is a Type-C event occuring, such as a connection or detach condition on the Type-C port. Therefore these events will not be sent when the battery is disconnected then reconnected, since this is handled by the BQ device. 

    When the battery is disconnected, the BQ device will shut down the converter until a valid battery is detected. Once a valid battery is detected it will trigger an interupt, which the TPS25750 is not able to handle. Therefore, the PD will never send the configuration I2C events to the BQ device during this condition and thus will never renable the converter and will not charge the battery.

    Regards,

    Brandon