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bq20z60R1 V1.05 No charge timeout if LTCHG=1 or HTCHG=1

Dietmar Fischer
Intellectual 275 points
Other Parts Discussed in Thread: BQ20Z65-R1, BQ20Z60-R1

Hello

We use the bq20z60R1 V1.05 in our battery design.

During our charging tests in the lower(LTCHG1=1) and higher(HTCHG =1) temperature range we observe that the charge timer doesn't count.

Therefore, no timeout failure occurs in these cases. Is this a bug in this firmware revision V1.05?

The technical reference of the bq20z60 "SLUU386-1" describes the counting of the charge timer as:

Charge Mode Timeout

When Current is ≥ Chg Current Threshold, the bq20z60-R1/bq20z65-R1 starts the Charge Timer. The
Charge Timer is suspended when charge is not active ([LTCHG] = 0, [ST1CHG] = 0, [ST2CHG] = 0, and
[HTCHG] = 0 , or when [DSG] = 1. The Charge Timer is reset when an amount of discharge greater than
Over Charge Recovery is detected or if the pack is removed and reinserted when [NR] = 0. Set Charge
Timeout to 0 to disable this feature.
The bq20z60-R1/bq20z65-R1 goes into charge mode charging timeout if:
• Charge timer ≥ Charge Timeout

In the standard temperature ranges ST1CHG=1 or ST2CHG=1 timeout failure occurs.

The programmed charge current for LTCHG and HTCHG is lower than in the standard temperature ranges.

 

Regards

Dietmar

  • 0
    TI__Expert 6470 points

    This may take some time to check it. We are all busy right now preparing for the upcoming training session. Are you sure that you are not in "DSG" mode?

  • 0 in reply to Doug Williams4811
    Intellectual 275 points

    Hi Doug

     

    Thanks for your reply.

    Yes we are not in "DSG" mode because we charge the battery during this observation.

    Today, I repeat this test at high temperature to double check it.

    The "DSG"-Flag in the Battery Status Register and in the Operating Status Register is cleared (0).

     

    Regards

    Dietmar

  • 0 in reply to Dietmar Fischer
    TI__Expert 6470 points

    Dietmar,

    We have duplicated the problem and are puzzled by the behavior also. The firmware engineers have also verified that the timers will only work in Charge Mode (CMTO) and Pre Charge Mode (PCMTO). When the temperature ranges are at the extremes, neither of these "modes" are active and therefore the timers are not working.

    We are still trying to investigate whether this was intended, or was an oversight in the design.

    Regards,

    Doug

  • 0 in reply to Doug Williams4811
    Intellectual 275 points

    Doug

     

    do you have any news for us?

    We have two projects with the bq20z60. Both developments are nearly finished.

    So, it's very important for us to know when TI can solve this problem!!

    And of course, we must be on schedule with our projects.

    If you can send us a new firmware, we can test it in parallel to fix this bug.

     

    Regards

    Dietmar