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fault in reading default registers of bq25120 through i2c using ev2400 interface(in bqstudio software)

BHARATH KUMAR
Prodigy 60 points
Other Parts Discussed in Thread: BQSTUDIO, BQ25120, EV2400

HI

    iam trying to read default register values of bq25120 through i2c interface of ev2400 using bqstudio software to see the values,but the problem is we did not get default values of the registers.there are some changes in default values.can anyone help me to sort it out please..

          Iam attaching the screenshot of the bqstudio output i got.please help me out.

  • 0
    TI__Mastermind 21590 points
    Hello,
    Are you checking this right after power-up? Can you ensure that there is no load on the device when this is taken.
    Regards,
    Raheem
  • 0 in reply to Raheem
    Prodigy 60 points
    thanks for your quick response
    yes iam checking this right after powerup and yes there is no load on the device..can you help me out in solving this issue
  • 0 in reply to BHARATH KUMAR
    Prodigy 60 points

    1.and if we connect a battery to bq25120,the charger status is shown as ready and if we remove the load charger status is shown as fault,so is this working fine.
    2.CD is always shown as HIGH(chip disabled),though we have pulled it down on the bq25120 board.


    Iam attaching the screenshot of the bqstudio output i got after connecting a battery.please help me out.

  • 0 in reply to Raheem
    Prodigy 60 points

    1.and if we connect a battery to bq25120,the charger status is shown as ready and if we remove the load charger status is shown as fault,so is this working fine.
    2.CD is always shown as HIGH(chip disabled),though we have pulled it down on the bq25120 board.

                             Iam attaching the screenshot of the bqstudio output i got after connecting a battery .please hepl me out on this. .please help me out.

  • 0 in reply to Raheem
    Prodigy 60 points
    can anyone help me out please?
  • 0 in reply to BHARATH KUMAR
    TI__Mastermind 21590 points
    Hello,
    I see some difference between the first picture you posted and the others. In the first image, the INT function is not enabled. By default, this should be enabled and i see it enabled in the other pictures you posted so this might have been changed after startup. The same goes for charge enable in register 0x03h, bit 1. Charge is disabled in the first picture but enabled in the other. The presence of a battery shouldn't change this setting. Also BUVLO is 2.8V in the first and 3V in the second. This also seems to have been changed after startup as inserting a battery should change this. There seems to be some changes being made after the startup seen in the bqstudio when the battery is absent. Can you please remove the battery and ensure that no changes are made on bqstudio then check the default registers again?

    Regards,
    Sharafadeen Raheem