BQ40Z50-R2: The function of Taper_volt bit

Steven Zhang

Part Number: BQ40Z50-R2

Tool/software:

Hi TI experts

I have a question regarding the Taper_Volt bit setting in the Charging Configuration, as shown below:

If this bit is set to 1, charge termination will be based on a fixed voltage value, rather than the charging voltage divided by the number of cells.

Let’s assume the charge termination voltage is 4300 mV, and the full charge voltage is 4400 mV.

Now, if cycle degradation is enabled and the charging voltage drops by 100 mV or more after 200 cycles, the new charging voltage would be 4300 mV or lower.

With Taper_Volt enabled, does this mean the battery would never reach full charge, since it can no longer reach the fixed 4300 mV threshold?

Thanks

Steven

1 month ago

0 Alan Frias 1 month ago

TI__Mastermind 26495 points

Hello,

Your question has been assigned and will be reviewed when possible. In the meantime could you attach the .log and .gg files associated with the project.

Thank you,
Alan

0 Steven Zhang 1 month ago in reply to Alan Frias

Prodigy 140 points

Hi Alan

It’s just a question based on my reading of the Taper_Volt function explanation in the TRM.

There’s no log for this. If you need a GG file, I’ve uploaded an example for your reference.

example.gg.csv

Thanks

Steven

0 Steven Zhang 1 month ago in reply to Alan Frias

Prodigy 140 points

Hi Alan

Any updates for this?

Thanks

Steven

0 Steven Zhang 1 month ago in reply to Alan Frias

Prodigy 140 points

Hi Alan

It's been two weeks since I last heard from you. Could you please provide an update on this ?

Thanks

Steven

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BQ40Z50-R2: The function of Taper_volt bit