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BQ40Z50-R2: Fast charging

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

Hello,

I am interested in making use of the fast charge function built into the Advanced Charge Algorithm available with the bq40z50.  My understanding is that because I have set the SOC_CHARGE bit in Charging Configuration register, RelativeStateOfCharge() will be used instead of the voltages threshold control for the Low, Medium and High charge rates - is this correct?  I am planning to use the default SoC Range thresholds of;

SoC Med: 50%

SoC High: 75%

Hysteresis: 1%

Assuming the battery temperature remains in the Recommended Temp (RT) range (between T5 and T6), does this mean that the charge current will be set as follows;

RelativeStateOfCharge(0-50%): RT CCH

RelativeStateOfCharge(50-75%): RT CCM

RelativeStateOfCharge(75-100%): RT CCL

Thank you,

Jeremy.

  • Hi Batt,

    Thank you for your answer.

    Further to this query, it's unclear to me what is meant by the statement on page 5 of SLUA875;

    "The voltage thresholds is replaced by SoC thresholds. The voltage range is still important since transitions happen if both the voltage range and Charging SoC: Mid and High conditions are met."

    What transitions are these?

    I would have thought that by using SoC I could ignore Voltage (sensible as it is a poor indicator for state of charge).

    Thank you,

    Jeremy.
  • The threshold changes are affected by both your selection of a voltage or an RSOC threshold. They are referring to changes in the charging current per the threshold levels. The voltage state defines the current state and the RSOC threshold defines the move to the next.