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BQ2970: V- and VSS short resistance and duration of application

oneil
Prodigy 115 points
Part Number: BQ2970

Tool/software:

Hi TI,

I have a question about the page 16 note about shorting the V- and VSS pins together to enable the discharge circuit:

How low a resistance of a short is required and how long must it be applied? Is this something that TI has characterized?

In some experimenting, I have been able to enable the discharge circuit with a resistance as large as 35k (I'm sure I could use higher, I just didn't try). It seems the larger the resistance, the longer you must wait before the discharge circuit is enabled.

I am looking to use a MOSFET to short these pins together to enable the discharge circuit. I am looking for some additional information to build confidence that my design will always work.

I will likely be connecting a short of <5 ohms between the two pins for <20ms. Will this be enough to reliably enable the discharge circuit?

  • 0
    TI__Mastermind 42060 points

    Hello Oneil,

    This was not characterized, as you commented.

    You should be able to use a MOSFET to briefly short it. I believe <5-Ohms for <20-ms is enough to enable it.

    I'd however suggest to do some testing on your side to see how reliable it is, but I think there should be no problems with these conditions. At least perform a quick test for it.

    Best Regards,

    Luis Hernandez Salomon