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BQ769x0 (BQ76920) - failure Check?

Saravanan Sivamani
Prodigy 70 points
Other Parts Discussed in Thread: BQ76920

is there a direct way to check for the failure of BQ769X0 (more specifically BQ76920)?

  • 0
    TI__Guru 54715 points

    The bq769x0 does not have built in self test circuitry.  As a simple check you could change from internal to external temperature sensing to see if the voltage reading changes. This will take some time to get feedback since temperature is measured only every 2 seconds and the MCU does not know when the sample will be taken.  It also won't work if your system can operate at a temperature where both sensors give the same voltage.   Otherwise you can implement some external circuit to check for a change in reading.  If you do this be sure to consider the reliability of the external circuit and be aware that the parts protection modes could respond to the test condition.

  • 0 in reply to WM5295
    Prodigy 70 points

    WM5295 said:

    The bq769x0 does not have built in self test circuitry.  As a simple check you could change from internal to external temperature sensing to see if the voltage reading changes. This will take some time to get feedback since temperature is measured only every 2 seconds and the MCU does not know when the sample will be taken.  It also won't work if your system can operate at a temperature where both sensors give the same voltage.   Otherwise you can implement some external circuit to check for a change in reading.  If you do this be sure to consider the reliability of the external circuit and be aware that the parts protection modes could respond to the test condition.

    Thank you