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BQ34Z100: Learning cycle and more

Angelok
Prodigy 20 points
Part Number: BQ34Z100
Other Parts Discussed in Thread: EV2400,

Tool/software:

I am having difficulty completing the learning cycle on our board utilizing the BQ34Z100. I have the EV2400 programmer and have successfully calibrated the gauge and have tried multiple times to get the gauge calibrated. I have yet to see the learned status switch to 05 from 04. Attached are the latest charge log and export of settings. I'm guessing that my setting are not quite right yet.

My other issue is getting the 4 LED configuration to work correctly. I have tried an external configuration as well as using the 4 LED built in configuration. I am using the I2C port and I think it makes sense that I cannot use the port and have the 4 LED built in configuration operational. But do I have to switch to HDQ mode to utilize the built in 4 LED?? Perhaps this is a mute topic until the gauge completes a learning cycle? I just assume that the LED should mimic the gauge as shown in BQ Studio if its 77% I expect 3 LED's lit if each LED represents 25%. I do not want to show SOH just RSOC.

My Battery pack is 14.4V 4.5AH (64.8Wh) and consists of 12 1.2V NiMH batteries is series. I'm using NiMH CHEM ID of 0641 which was the closest match at I think 4%. What setting are needed for NiMH, I assume I can leave taper current empty or default and its not used being that a NiMH CHEM ID is being used?  Looks like I need to run another discharge cycle one I ran last night did not save.  

My program deadline is approaching and would like to get this gauge working to a point that instills a higher confidence level in moving forward with this design.

 charge again.log

Charger board 0001 day 2.gg.csv

  • 0
    Prodigy 20 points

    Another Question I forgot to add to my first post. After enabling IT-Enable, how can I disable it? It seams as though once its enabled I can no longer change any setting du to an error writing or reading back from flash memory. The only way I am able to change anything is reflashing the device with initial firmware and starting over. Is that the only way?

  • 0 in reply to Angelok
    TI__Genius 14810 points

    Hi,

    Learning cycle:

    When I look at your log your voltage is dropping the entire time the batteries are in rest, the voltage needs to settle. The voltage appears to drop more than I would expect, I would verify these voltage reading are correct. At time 6000 there is a large spike in voltage and current, this cannot happen.

    Achieving The Successful Learning Cycle (tij.co.jp)

    LEDS:

    Are you using the BQ34z100EVM or a custom pcb?

    Do you have these registers configured correctly?

    The TRM describes how the LEDs will function.

    NiMH ChemID:

    Can you share your chemid report and data input.

    A poor chemid match can cause problems during the learning cycle.

    Please configure one of these bits

    Please also configure all critical parameters found at the beginning of the learning cycle document.

    IT disabling:

    IT cannot be disabled on this device once enabled, a default .srec will have IT disabled. You can flash that to disable IT.

    Regards,

    Diego

  • 0 in reply to Diego
    Prodigy 20 points

    Diego,

    Thankyou for the info. 

    For LED operation I cannot find this answer in any of the documentation. Using the direct 4 LED configuration as mentioned in the TRM, can I2C still be used to communicate with the gauge? The only mention of this is in the EVM documentation: Is this only for the EVM module? Can I use my custom board with the Direct 4 LED configuration and retain I2C comms? Otherwise I will switch to the external configuration. At this point I have been unsuccessful in seeing all 4 LED's operate as expected while keeping I2C enabled with the direct 4 LED. I understand that once I switch to HDQ mode it cannot be switched back to I2C??

    Schem attached and I will need to make updates to use HDQ.

    ChemID report is attached. I'm using ChemID 643

    Charge_rel-dis_rel _log-report.zip

    I have not been able to find the below snippet in any of the documentation that I have downloaded from TI. Where is this located. I'm a little unclear on how to set these. I have searched the TRM I have with no luck. TRM I have was revised September 2021

    Is there a list of critical parameters that needs to be configured for NiMH Vs other battery types?

    Regards,

    Angelo