• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 120 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ27621-G1: How to configure register in RAM memory

AMB
Prodigy 70 points
Part Number: BQ27621-G1
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

Dear TI team,

We are using IMX8M-mini to interface the the BQ27621 Fuel gauge. In our linux build using I2Ctool I do configure following register 

Toggle Power Min, Design Capacity, Design Energy, Terminate Voltage, and Taper Rate.

I do want that register values should remain fix even if I restart or reboot my device.

I do not want it to set every time whenever I power on my device.

Could you please guide on this.

Thanks,

Madhuri

  • 0
    TI__Genius 12006 points

    Hello Madhuri, 

    This gauge is designed so that when a reset or a POR occurs, then the gauge will revert back to the default values. This is not a flash gauge so there is no way around this. Please see the image below. 

    Typically how this is used is that a host MCU will read the ITPOR bit, and when this bit is set, you will have to reprogram your parameters onto the gauge. If you do not wish to do this, then you will have to use a flash gauge. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Hi Jonny,

    Thank you for your information. Can you suggest any flash gauge where we can set the terminate voltage. Because I want the gauge should show 0 percentage at 3V. 

  • 0 in reply to AMB
    TI__Genius 12006 points

    Hello, 

    There are a few options here for a 1S flash fuel gauge. Your options really depend on whether or not you are wanting internal protections or not. An option for a 1S flash gauge without internal protections is the BQ27Z561-R2. An option for a 1S flash gauge with internal protections is the BQ27Z746. Both options allow you to set the terminate voltage. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Hi Jonny,

    Thank you we will look into them.

    But one more thing i am curious about in bq27621 

    In our designing if I charge the battery to 4.2V fully and removed the charger i do get a sudden drop to 3.7V and also I am not getting proper SOC graph.

    Can you please suggest is our design ok? Such drop is acceptable while calculating SOC by BQ27621?

  • 0 in reply to AMB
    TI__Genius 12006 points

    Hello, 

    Can you please provide me with a bqStudio log file with this behavior and a gg file? 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Hi, We do not have the bqstudio.

    Anyways, can you tell me if this hardware behavior is acceptable to calculate SOC by BQ27621.

    Battery puts on charging but if we remove the charger i am getting sudden drop of almost 0.3V.

  • 0 in reply to AMB
    TI__Genius 12006 points

    Hey, 

    AMB said:
    In our designing if I charge the battery to 4.2V fully and removed the charger i do get a sudden drop to 3.7V and also I am not getting proper SOC graph.

    Would you be able to provide this SOC graph you are referring to then? I am waning to see if you are getting SOC jumps when the charger is disconnected. 

    Regards, 

    Jonny.