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TPS659037: How can I active TPS659037 when I plug in?

Walter Lee(Kor)
Prodigy 60 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5726,

Hi guys!

I'm trying to automatic turn on system when power on. (Without any botton)

So, PWRON pin connect to ground and LONG_PRESS_KEY.LPK_INT_CLR = 0 is enough for that system?

p.s. I'm using TPS6590375 and AM5726

From Lee.

  • 0
    TI__Genius 16410 points
    Hello Lee,

    What you suggest will work. However, I think you will need to clear the LPK interrupt every 12 seconds since the PMIC will keep seeing a long press key event.

    Another way is to connect GPIO_7/POWERHOLD and RESET_IN directly to LDOVRTC_OUT. This will enable the PMIC as soon as power is supplied, and will not require any software to keep it up.

    To support uncontrolled power down (when input is unexpectedly removed), you can modify this by connecting a supervisor reset or PGOOD pin from pre-regulator to RESET_IN, so shut down the PMIC when input supply is lost. We have a longer description with diagrams in this blog post.
    e2e.ti.com/.../how-to-meet-power-sequencing-requirements-with-a-pmic

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    Prodigy 60 points
    Hi Karl,

    Thank you for your solution!

    BTW, as I know that LPK activate condition is keep low state pwron pin. So I make LONG_PRESS_KEY.LPK_INT_CLR = 0 to deactivate LPK interrupt.

    In your suggestion 3 pins, GPIO_7/POWERHOLD, RESET_In and LDOVRT_OUT, connect is enough to activate TPS659037 when PMIC power get?

    From Lee
  • 0 in reply to Walter Lee(Kor)
    TI__Genius 16410 points

    Hello Lee,

    YEs, GPIO_7 and RESET_IN tied high will turn on the PMIC.  You can reference the ON requests and ON request gating conditions in the State Transition Requests section of the datasheet.  You need at least one ON request (GPIO_7/POWERHOLD), and all gating requests must be removed (RESET_IN=high, PWRDOWN=floating/GND).  And LDOVRTC_OUT automatically turns on when power is supplied to the device.  So if these pins are connected in this way, the PMIC will turn on.

    Regards,
    Karl

  • 0 in reply to Karl Wallinger
    Prodigy 60 points

    Hi Karl,

    I'm really appreciate your kindness.

    I'll update result.

    Thank you again Karl.

    From Lee