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Original question:

BQ20Z655-R1: Early Charge Termination

BQ20Z655-R1: TCA and FC values

user5503575
Intellectual 800 points
Part Number: BQ20Z655-R1

Hi,

I am having a trouble about values of TCA (set and clear) and FC (set and clear).

When TCA set %99 and clear %95, bq20z655-r1 turns off CHG fet at %99. Cells doesnt charge completely. It stops at %99.

If I deactive TCA (by set to%-1) , TCA flag and OCHGI flags set while charging . 

I need help to make a battery which gives me all cells capacity, charge completely  and terminate at XX miliampers(depends on cells).

I need help to decide TCA,TDA, FC and FD values Which values should I set to use all cells capacities?

Thank you!

  • 0
    TI__Mastermind 42535 points

    First, please make sure that your design capacity and Qmax are correct. We suggest using TCA = -1% simply because it will allow primary charge termination to determine when TCA is set. This requires your current to taper off, that will ensure your battery is fully charged. You can use FC set at VCT and FD can be left at default.