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Original question:

BQ76952: Sleep mode- Cannot enter into Sleep mode

BQ76952: bq76952 can not enter sleep when the DFET is off

sheng liu
Prodigy 40 points
Part Number: BQ76952

Hello TI Team,

I am trying to enter into sleep mode in BQ7695202 when the DFET is control off by DFETOFF pin. I have also set the necessary registers according to the attachment.

BQ76952-LFP-12S3P-1mR-01-20230217.gg.csv

  • Prodigy 40 points

    The following is the sleep state of the battery when the DFETOFF is pulled low and the DFETOFF is high

      

    the left figure shows the bq76952 active  when the DFETOFF is not pull down, the right one show the bq7695202  sleep when the DFETOFF is pull down.

  • in reply to sheng liu
    TI__Guru* 80963 points

    Hi Sheng,

    I tested this on my board. You are correct, disabling the discharge FET with the DFETOFF pin does prevent the device from going into SLEEP mode. If you disable the DSG FET with the DSG_PDSG_OFF() command, it will not prevent SLEEP mode, so this might be a better option for you.

    Best regards,

    Matt

  • in reply to Matt Sunna
    Prodigy 40 points

    hello Matt；

    Thank you for your reply. We can send DSG_ PDSG_ OFF() command while controlling DFETOFF PIN.