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BQ25890: What's the side effect when the watchdog timer is disabled?

Luke Peng
Prodigy 150 points
Part Number: BQ25890

Dear Sir,

    I would like to program VREG[5:0]=100011 to charge 4.4V battery.

To prevent VREG[5:0] from resetting to the default value 010111, I would like to disable the watchdog timer by setting WATCHDOG[1:0]=0

Is there any side effect or any other concern when the watchdog timer is disabled?

Thanks for your time.

Best Regards,

Luke

  • +1
    TI__Genius 15195 points

    Hi Luke,

    Usually the host device services the watchdog as a constant check to make sure the host can successfully communicate with the charger IC.

    With the watchdog disabled, the charger will not require these constant checks for I2C communication but the IC will also not be able to use the watchdog as a check for other failures or drops in host connection.

    The charger IC will still be able to detect charging, temperature, and OVP/OCP faults, but the watchdog fault will not be monitored after the watchdog is disabled. All the other IC functions should still operate normally with the watchdog disabled.

    Regards,

    James

  • 0 in reply to James Steenbock
    Prodigy 150 points

    Dear James,

    We just need to apply the 4.4V charging.

    Since the host device is not required to check if the comunnication with the charger is ok or not after setting to 4.4V charging, the watchdog fault could be ignored, right?

        Thanks for the reply.

    Best Regards,

    Luke

  • +1 in reply to Luke Peng
    TI__Genius 15195 points

    Hi Luke,

    If you do not plan to use the watchdog as a check for the host, you may disable the watchdog and ignore the fault.

    If the watchdog is enabled, specific registers will be reset every time the watchdog cycle finishes after failing to be serviced by the host.

    If the watchdog is disabled, the registers will not reset and no further interrupts will be generated after the initial disable command.

    Regards,

    James

  • 0 in reply to James Steenbock
    Prodigy 150 points

    Dear James,

        It's very clear.

    Thank you.

    Best Regards,

    Luke