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BQ40Z50-R2: EDV is Terminate Voltage?

Ivan Tokarev
Prodigy 70 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50, BQ4050

Hello. Recently I read some technical notes SLUAA45 and SLUA948.
1. In SLUAA45 was said that EDV is Terminate Voltage but in bq40z50 user guide there is no information about that. It is implied that all Impedance Tracking devices use Terminate Voltage as EDV and reports 0% SoC when Battery pack voltage reaches EDV ?
2. In SLUA948 no EDV is used, only Terminate Voltage. But seems that at Terminate Voltage battery should report 0% SoC.
Can you explain EDV and Terminate Voltage setting for bq40z50 ?

  • +1
    TI__Guru 57747 points

    Hello Ivan,

    Terminate voltage is the voltage below which the system will not work.

    EDV is sometimes the same as Terminate voltage if there is only one EDV point. bq40z50 has features related to EDV that require the terminate voltage to be set at a point close to 7% of SOC. There could be multiple EDV points in other CEDV gauges.

    A1. When battery reaches terminate voltage, then SOC is 0% assuming that the load select/load mode matches the applied load.

    A2. There is probably no EDV based feature in SLUA948 .

  • 0 in reply to Shirish
    Prodigy 70 points

    Can you explain a bit more about "bq40z50 has features related to EDV that require the terminate voltage to be set at a point close to 7% of SOC."? 
    Should I put Term Voltage to some special voltage that equals SoC = 7% ?

  • 0 in reply to Ivan Tokarev
    TI__Guru 57747 points

    Hello Ivan,

    If you think you can get better performance by setting FF_NEAR_EDV, then you can do that.

    Also see TURBO_EDV section in the TRM.

    I recommend using the bq4050 if a CEDV type implementation is desired.