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BQ2962: VC1 connects to VSS

Steven(Shenzhen) Shi
Mastermind 30515 points
Part Number: BQ2962

Hi team,

Customer use BQ296203 for secondary protection on their 3S Notebook project

If they short connect VC1 with VSS to ground does this have potential risk for PF function and REG output?

Thanks.

  • +1
    TI__Guru* 80843 points

    Hi Steven,

    Normally for 3 cells, most users follow Figure 9-2 in the datasheet which shorts V4 and V3. I think it may be okay to short V1 to VSS, but there is one place in the datasheet that seems to show there is some special significance for the V1-VSS voltage. If possible, they should short V4 to V3 to be safe instead of shorting V1 to VSS.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Mastermind 30515 points

    Hi Matt,

    Customer want this connection because they don't want RTC output and under this circumstance V1 will be in low voltage status and RTC doesn't have output. They wonder if they can use this implementation method and whether the protection of V2 V3 V4 will be influenced and the consumption will be affected compared with our recommendation. 

    Currently I recommend them to use our design and connect a 0.47uF capacitor on REG pin since they don't use the REG output. But they still want us to clarify the above questions. Thanks for your help.

  • 0 in reply to Steven(Shenzhen) Shi
    TI__Guru* 80843 points

    Hi Steven,

    Ok, I understand. I think this is probably not a good idea because if the regulator is turned off, this could possibly affect other internal circuits in the device. It was not designed to operate with the regulator forced off by a low voltage.

    Best regards,

    Matt