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Problem: indicating low battery with bq2014h

abraham gonzalez
Prodigy 70 points
Other Parts Discussed in Thread: BQ2014H

Hi,

 

I'm using a bq2014h and need to detect low battery to display an alert to the user.

The thing is that since the battery can be replaced at any time, the reading  (and the alert) will not be trustful there.

The datasheet says that the battery replaced flag (BRP) is asserted by a serial port command or by the application of VCC (but where?).

In a debug sequence I can see that the values at FLAGS1 and FLAGS2 doesn't change when the batteries are removed (the cap on RBI?).

 

I need a flag or a reliable indicator for a battery-replace event so I can ignore the low batt alert when the reading is uncertain.

Any ideas?

 

  • 0
    TI__Intellectual 2120 points

    The application of VCC refers to a power on reset where after VCC has been reconnected then BRP is set. THe RBI cap would need to be discharged for the RAM flags to clear.

    One option would be to power the uC that would read the BRP from the same VCC as the bq2014h, i.e.: directly from the cells. In this senario when the uC powers up it can read the gauge and read BRP to detect the replacement.

    During the period between the cells being replaced BRP =1, and also if CI = 1 then a learning cycle would be recommended to get the device aligned with the battery again. 

    I hope some of this helps.

    Best regards

    Garry