• State TI Thinks Resolved
  • Locked Locked
  • Replies 10 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 189 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ28Z620: Disable shutdown mode

Morgan Novak
Prodigy 235 points
Part Number: BQ28Z620

Tool/software:

Hello,

I only want to use the gauge in normal mode.

How do I accomplish this on the BQ28Z620?

Basically I want to be able to unplug batteries and plug back in and NEVER have to press a button or anything to have it come back up.

What settings should I be looking at to disable shutdown, sleep, ship modes?

Thanks.

  • 0
    TI__Mastermind 24751 points

    Hello, 

    To disable sleep mode, you can set the DA Config [SLEEP] bit equal to 0. To disable the other power modes, please refer to the BQ28z620 Technical Reference manual for the enter conditions for each of the power modes. You can then set the parameters to enter the other power modes such that the gauge will never enter the power modes. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 235 points

     

    Please explain in more detail. I want the IC to not startup in shutdown mode. 

  • 0 in reply to Morgan Novak
    TI__Mastermind 24751 points

    For example, you could set the shutdown voltage to be set to a low value where your system would never hit this voltage, such as 2.0V. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 235 points

    But would that work if the batteries are unplugged? I am only concerned with startup condition, when batteries are first plugged in.

  • 0 in reply to Morgan Novak
    Prodigy 235 points

    This is from the datasheet and what my circuit looks like: 

    But it doesn't turn on the first time unless I give it a "jump" which is impractical 

    If I move pack pin to the otherside of the mosfets, will the internals of the IC not work properly? 

  • 0 in reply to Morgan Novak
    TI__Mastermind 24751 points

    Hello, 

    What you are describing here does not correspond to the different power modes. If the gauge is disconnected from the battery and loses power then you will need to apply a voltage to PACK to wake the gauge. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 235 points

    Then don't you think you should not show the schematic as it does in the datasheet? This is a really bad design if it always needs a jump start.

  • 0 in reply to Morgan Novak
    TI__Mastermind 24751 points

    Hello Morgan, 

    This is a pack-side gauge, meaning that the intended use is for the gauge to be married to the battery pack (i.e. the battery is never disconnected from the gauge). With the pack-side implementation, if the voltage were to ever dip below the VStartup voltage (i.e. the scenario you are describing), then you would have to apply a charger to the pack to charge the battery. When you apply the charger to the gauge this would ensure that the voltage at PACK is greater than VStartup, thus "waking" the gauge. 

    This gauge can be used as a system-side gauge (where you would have a detachable battery), but there are some trade-offs, one of those being you need to manually apply a voltage on PACK greater than VStartup to wake the gauge. You can do this by having a push button, external circuitry, or applying a charger when a new battery is inserted. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 235 points

    That is good information to have had before I did the design. Does moving the pack pin to the cell side, damage the gauge or break its functionality?

  • 0 in reply to Morgan Novak
    TI__Mastermind 24751 points

    Hello Morgan, 

    I have talked with the team on this, and I believe a potential work around for this specific request could be to permanently connect the PACK pin to BAT+. 

    Regards, 

    Jonny.