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BQ76940: Internal registers during SHIP mode

Gabriel Godley
Prodigy 10 points
Part Number: BQ76940

Hi TI team, 

I was curious as to what happens to the internal registers of the device when it enters into SHIP mode. 

The scenario I am curious about is as such: 

1. The device senses OV and sets CHG_ON to 0 in response. 

2. The microcontroller sends the device to SHIP mode without Clearing the OV in SYS_STAT register. 

3. While the device is in SHIP mode the Voltage on the Battery cells discharges to below the OV threshold 

4.  The Microcontroller now wakes up the device.

5. Will the CHG_ON output be released automatically or not and will the OV signal still be latched? 

Will the device still have the OV bit latched from the previous cycle before it entered SHIP mode? 

Thanks. 

  • 0
    TI__Mastermind 42060 points

    Hello Gabriel,

    The SHIP/SHUTDOWN state means the device is completely powered down. So at wake-up the registers would be at the default. So I would not imagine the OV signal would be latched. When the part wakes up it would be the same as if a cell was just attached to the part. 

    Best Regards,

    Luis Hernandez Salomon