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BQ20Z95 TI shutdown

Mike_chute
Intellectual 825 points

I have set the ‘Shutdown Voltage’ = 8250 mV And the ‘Cell Shutdown Voltage’ =2500 mv under the Power tab. I adjust the cell voltage to 8100mv the Z95 stop communicating with the EV2300. I can readjust the volatge to 11.0v but have to jumper from across the charge and discharge fets to wakeup the pack. Will the pack wakeup if I place it into our charger? I can't jumper the pack as it is sealed.

Mike

 

  • 0
    TI__Expert 6470 points

    Mike,

    Yes, the charger will restart it. Once the device shuts down it is brain-dead and will require a kick start to the Pack pin.

    Rgds,

    Doug

  • 0 in reply to Doug Williams4811
    Intellectual 825 points

    A followup question

     

    I am trying to send a command 00 0010 to shutdown the Z95.

    I have the correct configuration set for shutdown

    Operation Cfg A = 6A29
    Operation Cfg B = 7ED8
    Operation Cfg C = 0001

    [Power(Power)]
    Flash Update OK Voltage = 7500
    Shutdown Voltage = 9000
    Shutdown Time = 10
    Cell Shutdown Voltage = 2500
    Cell Shutdown Time = 10
    Charger Present = 4000
    Sleep Current = 25
    Bus Low Time = 5
    Cal Inhibit Temp Low = 5.0
    Cal Inhibit Temp High = 45.0
    Sleep Voltage Time = 5
    Sleep Current Time = 20
    Wake Current Reg = 03

     

    I have the battery board with 3 210 resistors to simulate a battery pack. I have adjusted the supply to 8.5 volts .Nothing happens when I send the 00 0010 under the Pro Command page. The pack doesn't seem to shutdown until I run the supply to 7.5vdc. Any ideas?

    Mike

  • 0 in reply to Mike_chute
    TI__Genius 10235 points

    Here are the requirements for entering shutdown mode:

    If your DSG FET is on when sending this command, there will be voltage on the PACK pin. This will prevent shutdown due to the qualifier: PackVoltage < Charger Present.

    Lowering the voltage to 7.5V probably triggers a PUV or CUV, which shuts off the DSG FET, allowing the pack to shut down.