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BQ25790: BQ25790 QON for power reset

Hollis Liu
Intellectual 2565 points
Part Number: BQ25790

Hi Team,

customer doesn't want the system power reset when there is logic low of tRST(typical 10s)  duration on QON pin. Can we remove that? If no, can we add the tRST to 20s?

From datasheet, we know 'A logic low of tRST (typical 10s) duration on QON pin' will result in a system power reset. if we set the SDRV_DLY to be 0, the power reset will happen in 20s (10s tRST + 10s delay), right?

  • 0
    TI__Mastermind 36965 points

    Hello,

    You can leave the QON pin floating if you do not wish to use it.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0
    Prodigy 10 points

    Hi 

    I  don't want the system power reset when there is logic low of tRST(typical 10s)  duration on QON pin, but i need the ship mode function，so i can't  leave the QON pin floating. 

  • 0 in reply to lei liu
    TI__Mastermind 36965 points

    Hello,

    I am confused by your statement. You can control the Ship Mode with I2C.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0 in reply to Michael Emanuel35
    TI__Intellectual 2565 points

    Hi Mike, 

    Let me clarify our questions. 

    Currently in our test, we find if we set the SDRV_DLY = 1(disable the 10s delay), 10s-duration logic low on QON pin will not make the system power reset. And we need a 20s-duration logic low on QON pin to trigger the system power reset. 

    Is that expected? Thanks. 

  • 0 in reply to Hollis Liu
    TI__Mastermind 36965 points

    Hello,

    I tested the BQ25790 and have the following results:

    When SDRV_DLY is 0, after holding QON for 10 seconds and waiting another 10 s, the system power is reset.

    When SDRV_DLY is 1, after holding QON for 10 seconds, the system power is reset.

    Please make sure you have SFET_PRESENT = 1.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question