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BQ27441-G1: Configuration Problem

Harish MR
Intellectual 365 points
Part Number: BQ27441-G1
Other Parts Discussed in Thread: GPCCHEM

Hi Friends

I have some doubts regarding the following

1) Can we configure or is that a valid method of changing the guage cc_gain and configure the 8000mAh capacity to 10000mAh fuel guage.

2) I am able to detect the insertion and removal of battery by reading the flag register. And after that I am configuring the guage capacity according to my battery specs which is 10000mAh.

But when battery charger voltage is present and at that time if I remove and insert the battery and after the configuration then battery's remaining capacity and full charge capacity will be same. I don't have any reference schematic to check if their is any problem with my schematic.

Regards

Harish

  • 0
    TI__Guru* 76230 points
    -the cc gain is not related to the capacity which the gauge can handle.
    If you are using a different battery other than what was designed, you need to reconfigure your device from scratch
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Intellectual 365 points
    Hi Onyx
    Thank you for the reply, Can you just tell me about second point which I have mentioned ???
    Regards
    Harish
  • 0 in reply to Harish MR
    TI__Guru* 76230 points
    I don't understand what you are asking in your second question. If you are having accuracy issues, you need to determine if this gauge is a good fit for your application by using our online tool gpcchem
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Intellectual 365 points

    Hi Onyx

    Sorry for the late reply, During initialization of the IC if their is a charging current flowing on between SRP and SRN it is affecting my battery's remaining design capacity.

    So can I do initialization during this condition or not ???

    Regards

    Harish

  • 0 in reply to Harish MR
    TI__Mastermind 42535 points
    The gauge will initialize, however it won't be as accurate as when there's no current. To use this gauge, you need to perform a chem ID match using GPCCHEM and then program those parameters as well as the cell parameters in. After that you have to do a learning cycle. Then you can use it.
  • 0 in reply to Batt
    Intellectual 365 points

    Hi Batt

    I am not using evaluation board,  I have a board in which I have installed this IC and on the basis of the reading of the IC  I am controlling the power.  So when I power on the board I will read the battery readings like temperature,  voltage, design capacity and remaining design capacity, now on the basis of remaing design capacity I power on some other peripherals,  So is their any way to do like that???

    Regards

    Harish

  • 0 in reply to Harish MR
    TI__Mastermind 42535 points
    Hi Harish,

    Yes, you can do that. All I'm saying is there will be a small error. That will not be so large as to prevent you from powering up your devices as you mentioned here. I would suggest that you set a reserve capacity level to gracefully power down your circuits when the battery is depleted. What this does is, it calculates your RM, FCC keeping away the capacity (say 20-40mAh) as reserve power for system shutdown. So, when the true RM reaches reserve capacity, the system indicates 0% RSOC. This can be used to initiate shutdown. This is how laptops typically do it.