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BQ76940: BQ76940 : how to simulate internal fault?

Valerio Sell
Intellectual 310 points
Part Number: BQ76940

Dear TI,

i have application with 

BQ76940

i have to simulate internal fault in i2c receive flags :

DEVICE_XREADY (Bit 5): Internal chip fault indicator. When this bit is set to 1, it should be cleared by
the host. May be set due to excessive system transients. This bit may only be cleared (and not set) by
the host.
0 = Device is OK.
1 = Internal chip fault detected, recommend that host microcontroller clear this bit after waiting a
few seconds. Remains latched high until cleared by the host.

How to do this fault?I do some transient in battery?

Thanks

Best Regards

Vale

  • 0
    TI__Guru 54715 points
    Hi Vale,
    It is not expected to occur in normal operation but things can happen. It is not our intent that you break the device, but you may want to see how your software responds to the fault.
    In evaluation:
    To see the bit set you might leave the upper cell group un-powered.
    If you power the board with simulated cells you can drop either the upper or middle cell group below the VSHUT until the XREADY fault appears, then raise the voltage.
    You might momentarily short across the CAP2 or CAP3 capacitor.
    You might apply a voltage > 1V across the TS2 or TS3 thermistor and boot device, or shut down and boot the device.
    If you disrupt the bottom cell group you will loose the ability to communicate with the part. For example if you have the part operating and bring the bottom group below VSHUT it is expected to nack until you raise the voltage and boot the part again. Once it is operational XREADY is expected.
  • 0 in reply to WM5295
    Intellectual 310 points

    Dear TI,thanks for help me.For simulate internal fault in my application,i do this procedure in my board?I try to do this procedure.Thanks.best Regards Vale