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BQ24296: Shipping mode

Thuan Vu
Intellectual 460 points
Part Number: BQ24296

To put the device in shipping mode, the datasheet says to:

"disable the watchdog timer (REG05[5:4] =00) and disable BATFET (REG07[5] = 1) at the same time."

What is meant "at the same time"? Is there a maximum time between making the two register settings?

When disabling the watchdog timer(REG05[5:4] =00), does the device automatically revert to the previous setting after a certain time? I'm seeing this behaviour but I'm not sure if it is the bq24296 or our host SW that's doing it.

  • 0
    TI__Mastermind 25800 points

    Hey Thuan,

    This does not necessarily mean disabling the bits at the same time. Likely, at the time of the datasheet was written, the writers meant to disable watchdog and then disable Q4 (to enter shipping mode) in the same I2C multi-write sequence. The important thing here is if the Q4 OFF bit is toggled before the watchdog timer is disabled and a sufficient amount of time has passed that equates to a watchdog reset, then the Q4 FET will be turned back on. 

    In regards to your second comment, once the watchdog timer is disabled, the charger should not revert back to previous settings, unless there is a complete POR of the charger, or the input adapter is removed and plugged in again, which will only affect the IINDPM register settings. 

    Regards,

    Joel H