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TPS65911: control by PWRON and PWRHOLD

K.Hamamoto
Guru 12155 points
Part Number: TPS65911

Hi

It's mentioned at datasheet about "PWR ON enable" condition as below,

1) None of the device POWER ON disable conditions are met.

2) PWRON signal low level

Or PWRHOLD signal high level.

But PWRON signal must be low when PWRHOLD signal rising up.

(This was explained at previous post.)

https://e2e.ti.com/support/power-management/f/196/t/862132?tisearch=e2e-sitesearch&keymatch=TPS65911

So that, 2) is should be, PWRON signal should be low level  "AND" PWRHOLD signal high level".

Q1：Is this correct? (Not "Or" condition)

+Looking at the logic circuit diagram below, it looks like “OR”.


On the other hand, Switching-ON and OFF sequence is started by PWRHOLD. (Fig 5-1)

Q2: So, if we want to start the Switching ON in this case ,can the customer control by PWRON signal after the above PWR ON sequence such as from state of PWRON =high and PWRHOLD = high?

Best Regards,

Koji Hamamoto

  • 0
    TI__Mastermind 30260 points

    Hamamoto-san,

    I have assigned this question to the device expert who will provide an answer or ask follow-up questions.

  • 0
    TI__Mastermind 33710 points

    Hi, Koji,

      After talking with an expert on the device, it's necessary to know the exact part number (like orderable part number) that customer's using, since there are some signals  in the PMIC power control diagram ( like PWRHOLD, DEV_ON, AUTODEV_ON and PWRDN, etc.) are OTP programmable. 

      Would you please help to get the orderable part number from customer?

     

     

  • 0 in reply to Phil Yi40
    Guru 12155 points

    Hi Phil,

    Thank you for your support. And I am sorry many question. Because we need to explain  this solution to our customer as soon as possible.

    For your question , part number in TPS659114A2ZRCR.

    I hope this will help.

    Best Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    Guru 12155 points

    Hi Phil,

    And what I got confused is there is two switching on sequence such as Fig 5-1 by PWRHOLD and Fig5-2 by PWRON. 

    In my understanding, the both of PWRHOLD and PWRON need to be active(PWRHOLD = High , PWRON = Low) when the switching on (means the each output voltage start up as Fig 5-1.). 

    Could you correct me if my understanding is not correct.?

    Best Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    TI__Mastermind 33710 points

    Hi, Koji,

      From the TPS659114 user guide (Linked here); yes, both of PWRHOLD and PWRON need to be active (PWRHOLD = High , PWRON = Low) since the TPS659114 EEPROM has the PWRHOLD feature implemented instead of GPI. 

      Please go through the whole User Guide and then you'll see the clear picture for the power control of the PMIC device. 

  • 0 in reply to Phil Yi40
    Guru 12155 points

    Hi Phil,

    Thank you for your reply. I know the sequence at that application note but there is no PWRHOLD signal. That's why I got confused.

    So,let me summarize,

    1. Keep PWRON Low (or High?) before the supplies(=VCC7/V5IN) start up . (PWRON NOT start up at same time with VCC7/V5IN)

    2. if PWRON is high , keep the same level for 100ms. Then set to low.

    3. After 1 and 2, PWRHOLD set to high. (Then the switching will start.)

    Is this sequence correct?

    Best Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    TI__Mastermind 33710 points

    Hi, Koji,

      Please do followings:

    1. PWRON and PWRDN should be pulled high.

    2. After supplies(=VCC7/V5IN) start up and stable.

    3. Pull PWRON low more than 100ms and then release it to be pulled high; then the PMIC should be power on.

    4. After 2 and 3, set PWRHOLD high; then the switching will be kept active.

  • 0 in reply to Phil Yi40
    Guru 12155 points

    Hi Phil,

    It's all clear now. I appreciate your kind support.

    Best Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    TI__Mastermind 33710 points

    Great! please help to close the question thread.