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BQ28Z610: Chemistry ID selection when there's 5 with the same name

Eduardo Barcellos
Intellectual 420 points
Part Number: BQ28Z610
Other Parts Discussed in Thread: GPCCHEM,

Hello E2E-Community members,

On the "bq28z610EVM 1- to 2-Series Li-Ion Battery Pack Manager Evaluation Module" - https://www.ti.com/lit/ug/sluube3/sluube3.pdf?ts=1655680037444&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FBQ28Z610EVM-532 - it says:

However, the Chemistry window has 5 that matches mine (the NCR18650B):

Should I do a Chemistry ID Matching process just for that? Or if I just pick the first one it'll be close enough with maybe a small deviation on the Relative State Of Charge value (registers 0x2C/2D)?

Thanks in advance

  • 0
    TI__Guru 57747 points

    Hello Eduardo,

    The model numbers are slightly different and the descriptions have differences. Check the cell datasheet and see which one is the best fit. You can always do a GPCCHEM match to confirm.

  • 0 in reply to Shirish
    Intellectual 420 points

    Hello Shirish,

    To simply do it for the 1st time, just to see progress on the system, what would be the consequence of simply picking the 1st NCR18650B of the list? Would it be critical? Or would it be close enough, and we would just see a small percentage error on the Relative State of Charge register value?

    Keep in mind that it's not easy for first-timers to just do all those process such as Chemistry ID Matching. And it's very likely we'll also get it wrong.

    After everything is clear I can come back and do a Chemistry ID Matching, specially because I can't find the datasheet for these cells.

  • 0 in reply to Eduardo Barcellos
    TI__Guru 57747 points

    Hello Eduardo,

    You can evaluate with any chemistry.

    Selection of incorrect chemistry will result in SOC errors. The error gets larger as the match is further away.

    When you want to try a new chemistry, start by programming the default firmware to BQ28Z610 to reset all learnt data from previous chemistry.