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BQ40Z50: How to recover after errors

Mark Cullen
Prodigy 180 points
Part Number: BQ40Z50

If the device detects an error lets say Overcharge the charge and discharge FETs are turned off. If you follow the examples in the datasheet that would effectively remove VCC from the device and power it off. Since it is now off there is no way to enable those FETs and re power the device. 

In these conditions how should I recover from that error.

  • 0
    TI__Mastermind 42535 points

    The dsg fet will not be turned off in OC, your dsg fet will still be closed allowing for dsg. Once the overcharge condition has been resolved by a dsg or by a battery removal indicated by a pres transition.

  • 0 in reply to Batt
    Prodigy 180 points

    Thanks Batt

    That's interesting, I'm sure I have seen situations where both FETs are off but it's hard to tell as the device is not accessible from I2C. I will try and get some more information if it happens again and post a new question.