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bq20z65 sets TCA-Bit when CUV-Bit is set

Dietmar Fischer
Intellectual 275 points
Other Parts Discussed in Thread: BQ20Z65

Hi,

we have the following problem with the bq20z65R2R2 v1.06

We have stored a discharged Lithium-Ion battery pack few weeks with this status in our lab.

Now, we have tried to recharge this battery with a smart charger and also with a power supply, but no current flows into the battery.

I read out the bq20z65 and I see that the TCA-Bit is set even though the CUV-Bit is set.

All FET's are also off.  We can't charge the battery. What happened to this battery?

We need your help because we are nearby the final state of our product and we want to produce it soon.

But I think we have to solve this problem before.

Thanks for your help

Dietmar

  • 0
    TI__Genius 10235 points

    The reason the CHG/PCHG FET is not on is  because you haven't enabled Impedance Track. You need to send 0x0021 to MAC (address 0x00) to enable the IT algorithm and turn FET control over to the firmware. You will need to do this while the device is unsealed. This step should always be done before the device is sealed.