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BQ2084-V143: CEDV Data Collection Clarification

Steve Widener
Genius 11010 points
Part Number: BQ2084-V143
Other Parts Discussed in Thread: BQSTUDIO

http://www.ti.com/lit/ug/sluub45a/sluub45a.pdf provides guidance on collection data to calculate the CEDV coefficients for the BQ2084. Please clarify the following:

1. We have a string of 2 cells (8.4V), does CellTermV refer to the string voltage or the cell voltage? (Some example data shows the string voltage terminating at 3000mV for this case)

2. How low (V/cell) should the string be discharged for data collection?

3. What time interval range should be used for data collection ( 1 data point per 4 seconds?)

  • 0
    TI__Expert 4065 points
    Hi Steve and sorry for the late response.
    1. It refer to Cell terminate voltage.
    2. Typical value is 3000mV, since you don't want to discharge your battery below system turn-off voltage.
    3. bqStudio will scan and log all of the registers the user have selected even though it will take longer than 1 sec to scan and log selected resistors in case the user had selected 1 sec time- interval, i.e. the priority is to scan and log all the selected resistors then to the selected time-interval for data logging.
    Best,
    Haidar