• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 62 subscribers
  • Views 853 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.

TPS659037: BOOT0 & BOOT1 Connection

Thariq CP
Intellectual 560 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5728, , TMDSEVM572X, TPS53319

Hi,

TPS659037 is used with AM5728 in our design, based on TMDSEVM572x. There is no separate power on switch on the board. What is the connection required on BOOT0 & BOOT1 pins in this case?

Please check the connections below and give your feedback.

  • 0
    TI__Genius 10000 points

    Hi,

    Please check out the user's guide if you haven't already: https://www.ti.com/lit/pdf/sliu011

    BOOT0 will determine which DDR voltage you are using (1.35V or 1.5V). BOOT1 should be set high if you plan to use the warm reset function of the PMIC with an AM57x processor.

    Thanks,

    Nastasha

  • 0 in reply to Nastasha
    Intellectual 560 points

    Hi,

    Thank you for clarifying. Please confirm the connections of PWRON, POWERHOLD pins in the scehmatics for use without a power on switch.

    Regards,

    Thariq C P

  • 0 in reply to Thariq CP
    TI__Genius 10000 points

    Thariq,

    PWRON should be left floating if unused (it is internally connected to VCC1 so you don't want to ground this pin). POWERHOLD/GPIO_7 is the signal used to enable the PMIC. If you connect this to VRTC, then the PMIC is always on when power is supplied to VCC1. This means that there is no way to execute the power down sequence to safely shutdown the AM57x processor before removing power. I recommend using an external signal to control POWERHOLD if you want the capability to turn off the processor before loss of power. Even a power good signal of a pre-regulator may do the trick.

    Thanks,

    Nastasha

  • 0 in reply to Nastasha
    Intellectual 560 points

    Hi Natasha,

    We are using TPS53319 to generate VCC1 which has a PGOOD output at 5V. Can this signal be connected at POWERHOLD using a resistor divider? Should the pull-up (R506) be removed in that case?

    Regards,

    Thariq C P

  • 0 in reply to Thariq CP
    TI__Genius 10000 points

    Thariq,

    The POWERHOLD pin can handle up to 5.25V. The 5V signal will be okay if there is not too much noise, otherwise you can divide it ask you suggest. You are correct, the pullup can be removed.

    Thanks,

    Nastasha