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BQ76952: Using CFETOFF and DFETOFF with DCHG and DDSG

Anurag Kumar2
Prodigy 180 points
Part Number: BQ76952

Hi,

I am trying to use low-side FET drive with BQ76952, Is it possible to control DCHG and DDSG with CFETOFF and DFETOFF?

Another thing is, how should I connect LD pin while using Low side FET drive, to PACK+ or PACK-? Is LD pin responsible for Charger detection?

Regards,

Anurag

  • 0
    TI__Guru 54715 points

    Hi Anurag,

    Yes, you can use CFETOFF and DFETOFF with the DCHG and DDSG outputs.  Be sure to configure both the input and output pins.

    In the BQ76952 there is a charger detection threshold on the PACK pin as noted in the technical reference manual section 13.4.2.6.  But the term is also used for wake up which is a threshold (VWAKEONLD) on the LD pin.  The alternative wake up is to pull down TS2.  With standard series FET configuration connecting a charger will pull up LD.  With low side FETs you can manipulate LD or TS2 to wake the part. You would need some circuit to do either.

     

  • 0 in reply to WM5295
    Prodigy 180 points

    Hey,

    Thanks for the reply.

    I am using Low-side FET protection.

    Is there a possibility, where if I connect LD pin PACK+ it might stop AFE from entering into SHUTDOWN mode, because it will be pulled up above threshold.

    Regards,

    Anurag

  • 0 in reply to Anurag Kumar2
    TI__Guru 54715 points

    Hi Anurag,

    Correct, holding LD high will prevent shutdown, but if commanded to shut down it will enter a soft shutdown mode.  See the last paragraph of section 7.5 of the technical reference manual.