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TPS65911: PWRHOLD at startup sequence (TPS659114)

K.Hamamoto
Guru 12155 points
Part Number: TPS65911

Hi

At Figure 5-5 on the datasheet, PWRHOLD goes high after TdSONT and TdONPWRHOLD.

On the other hand, PWRHOLD is pulled up to VIO(1.8V) by pull-up resistor on our configuration. So, PWRHOLD goes high automatically when the VIO started up.

Is that ok?

On the following timing sequence it looks that we should set this pin to high by external GPIO after TdSONT and TdONPWRHOLD.

Regards,

Koji Hamamoto

  • 0
    TI__Genius 13850 points
    Hi Koji,

    Thanks for your post. I have assigned the thread to the expert on this device.

    Best regards,
    Jari Niemelä
  • 0
    TI__Genius 10000 points

    Koji,

    Hi, as long as the PWRHOLD is high within 970ms after NRESPWRON goes high, there is no issue. Using a pull up resistor with VIO should not be a problem. Below is the table from the data sheet with more information. Please let me know if you have any additional questions.

    Thanks,

    Nastasha

  • 0 in reply to Nastasha
    Guru 12155 points
    Hi Nastasha-san

    Thank you for your reply. And I am sorry for the delay in my response.

    What I would like to ask is that the PWRHOLD is high by internal signal (not by external signal) within 970ms after NRESPWRON goes high at startup.

    Is that correct?

    Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Genius 10000 points

    Hamamoto-san,

    PWRHOLD is an external signal. Based off of the signal applied to the PWRHOLD pin, as well as the DEV_ON pin and PWRON pin, the device will determine if it should turn on. The logic for these signals can be found in the datasheet (6.3.1 State Machine) and is also shown below for convenience.

    Thanks,

    Nastasha