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HD3SS214: How to power the IC during the different power states on a PC?

MICHEL COLLIN
Prodigy 190 points
Part Number: HD3SS214

Hi everyone,

We use the IC on a motherboard built around a COM Express module Type 6.

We have the following power states: G3, S5, S4, S3, S0.

As a reminder, G3 is mechanical off, S5 soft off, S4 suspend to disk, S3 suspend to RAM, S0 on.

How would you power the IC? 

With a power supply that only remains during S0 or something else?

Thank you.

Best regards,

Michel

  • 0
    TI__Guru**** 177886 points

    Michael

    HD3SS214 can only be on, off, or in standby mode (OE pin low).

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 190 points

    Hi David,

    Thanks for reply.

    I know that the IC can be on, off or in standby mode.

    The question is when according to the power states of the computer.

    Let's take an example.

    You are working on your computer: it is in S0 state.

    You have a phone call and you have to quit your computer.

    Because you don't work on it anymore, you don't touch the keyboard anymore, you don't touch the mouse anymore, your computer will enter another power state: S3.

    Your computer is sleeping and is keeping the RAM content for you.

    When done with your phone call, you are going to move the mouse to wake up your computer.

    It will quit S3 to reenter S0 power state mode.

    My question is: do you power the IC following 3V3_S0 meaning that you lose the power while entering another mode from S0.

    Given that there is no I2C programming to the IC, we can guess that we can use 3V3_S0.

    We can also choose to keep the 3V3 power supply always and make the IC enter standby mode as soon as your computer quits S0.

    What do you think?

    Best regards,

    Michel

  • 0 in reply to MICHEL COLLIN
    TI__Guru**** 177886 points

    Michael

    From HD3SS214 perspective, it doesn't care. 

    If we look at the HD3SS214 standby current, it is 2.5uA when OE pin is driven low. Does this meet your S3 power consumption design requirement? If not, then we may have to consider shutting down the HD3SS214 completely by removing the power from the IC. 

    Thanks

    David