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BQ27741-G1: Cannot complete GDK routine without "unexpected" end task in discharge.

Scott Harshman
Prodigy 30 points
Part Number: BQ27741-G1
Other Parts Discussed in Thread: BQSTUDIO, GASGAUGECHEM-SW

I have the gauge and BQ27GDK000EVM set up for use in determining cell chemistry and until recently it appeared to be working. I am testing a "new" (to us) Li-ion cell from a different manufacturer using the same setup, and our prior fuel gage .srec file for the chemistry tests as we believe it will be pretty close to our existing cell. I have repeatedly seen that the gdk routine will stop in discharge, and its not clear why. The status will read "End Task (unexpected): Discharge - False", however I can see that there was a negative current on the cell at the time until the routine stopped.  log files are available as needed to help. 

Additionally, the GDK hardware does not appear available anywhere for purchase, is there a replacement? 

  • 0
    TI__Guru 57697 points

    Hello Scott,

    The GDK has been obsolete for a few years now because it has had issues. You can try older versions of bqStudio (probably 1.3.44) which are likely to have better support for GDK. GDK support has been removed in recent versions of bqStudio

  • 0 in reply to Shirish
    Prodigy 30 points

    With the GDK "having issues" and obsoleted, does this mean TI has not other off the shelf hardware solution for automated charge and discharge sequences, or is it just the BQStudio software side of the GDK that has issues? 

  • 0 in reply to Scott Harshman
    Prodigy 30 points

    Additionally - Looking for BQStudio 1.3.44 on the TI site, I cannot find any download location for this version. Is it possible to provide a link? I see only 

    v1x

    1.3.101.1 (07 May 2020)

    1.3.86.6 (12 Jan 2020)

    1.3.54.1 (17 Jul 2017)

    1.3.54.0 (03 Aug 2016)

    1.3.52.1 (13 Jul 2017)

    1.3.51.4 (11 Apr 2016)

    1.3.45.6 (28 Mar 2016)

    1.3.42.2 (09 Aug 2015)

  • 0 in reply to Scott Harshman
    TI__Guru 57697 points

    Try between 1.3.42.2  and 1.3.86.6. Support for GDK was definitely dropped after that(not sure about 1.3.86.6). There is no other automated hardware solution equivalent for GDK from TI.

  • 0
    Prodigy 30 points

    Double checking through numerous documents related to chemistry, and given the SW and HW issues noted below, is it possible for us to send our proposed use cell into TI as suggest by TI document SLUA903, Achieving The Successful Learning Cycle; "The ChemID identification requires running a relax-discharge-relax (rel-dis-rel) test while logging data using the gauge’s GUI (bqStudio) and then using gpc chem tool with the logged data to identify a close match. If there is no match, then the cells have to be sent to TI for characterization and ChemID generation. Contact a local field applications engineer if cells have to be sent to TI. Once a ChemID has been identified or created, it has to be programmed on the fuel gauge."

    So far in numerous runs we cannot get a set of data that seems to match up for this cell. (Moli Cell ICP103450DA)

  • 0 in reply to Shirish
    Prodigy 30 points

    Using the suggested BQstudio version above (1.3.45), but also switching to SOC 0% as a cycle endpoint, I did get through a successful rel-dis-rel cycle. I see that the gauge is showing the battery at 3.4v when at 0% SOC, which seems odd. I have calibrated the system against temperature, current and voltage, so I know those are accurate. Is it possble that the fuel gauge paramters from our old cell are throwing off the readings for the new cell? The understanding was that it would be close enough to use for the chemistry run on the new cell. 

  • +1 in reply to Scott Harshman
    TI__Guru 57697 points

    Hello Scott,

    To get a good chemistry match, make sure to use bare cells without protectors and ensure Kelvin connections while taking the log. You can update the chemistry in bqStudio by downloading GASGAUGECHEM-SW and then check if the specific cell model is present. If there is no acceptable match, then you will need to send cells to TI for characterization.