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BQ27Z746: Previously worked, now blocking system - unsure reason

Morgan Novak
Prodigy 235 points
Part Number: BQ27Z746

Hello,

I am using the BQ27z746 chip. I have been using it for awhile and set my settings using TI GUI.

Then I final installed it into system. It worked a couple of times.

Now it seems that the battery gauge is not charging or discharging. 

The status register is 192 (decimal) 

The interrupt register showed RSOC interrupt.

I cleared RSOC flag.

Still not charging/discharging.

Any ideas?

  • 0
    TI__Mastermind 37761 points

    Hey Morgan,

    Can you send me the gg file from the gauge? Can you also send me a log file of you attempting to charge and discharge the battery.

    Regards,

    Nick Richards

  • 0 in reply to Adrian
    Prodigy 235 points

    we don't have a gg file right now, but will attempt to generate one later today.

    We're still trying to figure out how to re-enable charging and discharging.  We have a system set up that's a duplicate of some of the ones that aren't functioning and were able to get it to present the same Ops Status A and B if we cranked up the discharge RSOC to 100%.  We've tried a number of things and still can't re-enable charging and discharging.  The reset command didn't seem to do it, and there doesn't seem to be an overriding "charge and discharge enable" command.

    Thoughts on where we should be looking or commands we should be trying to reset the chip?

  • 0 in reply to Adrian
    Prodigy 235 points

    We have read the ops status via "special command" where we send 0x54 0x00 to 0x3E and it returns 0x54 0x00 0x80 0x61 0x41 0x00.

    We're still learning/reading/probing, but maybe we're stuck in shutdown?

  • 0 in reply to Adrian
    Prodigy 235 points

    we're also open to a call if that works for you

  • 0 in reply to Morgan Novak
    TI__Mastermind 37761 points

    Hey Morgan,

    If you can read from the gauge then it is not in shutdown mode. You can try reprogramming a fresh srec file to completely reset the gauge. Sending a log and gg file will really help me find the root cause of the problem.

    Regards,

    Nick Richards

  • +1 in reply to Adrian
    Prodigy 235 points

    It was in shutdown mode. It was put into shutdown mode by the timer. In order to get it out of shutdown mode I sent a reset. Then I disabled the timer. It seems to be working again