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BQ40Z60: Emergency Shutdown Current

keith nethercott
Prodigy 80 points
Part Number: BQ40Z60

When I issue an emergency shutdown command, I observe a shutdown current that varies between 250uA to 1mA.

Is there a way to reduce this shutdown current to a value more practical such as less than 30uA?

  • 0
    TI__Intellectual 1840 points
    Hi Keith,

    So emergency shutdown mode is a special kind/case of shutdown in which the CHG and DSG FETs are open, therefore disconnecting battery power to the system load - but the gauge itself is still on (drawing 250uA to 1mA) because you will still need to communicate with the gauge to turn off/on emergency shutdown mode.

    The normal shutdown mode should turn off both FETS and make the gauge inactive and unable to communicate with. This should give a shutdown current of 0.5uA to 2uA. To wake up the device, a voltage > Charger Present Threshold must be applied to the VACP pin.

    Hope this helps.