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BQ769142: BQ769142 Watchdog query

Star Xu
Genius 9645 points
Part Number: BQ769142

Hi

I have some query about watchdog need your help.

1, The BQ769142 sets the parameters then is completely powered off. At this time, after powering on, will the values ​​become the default values ​​or will they remain the setting values?

2, When BQ769142 triggers the watchdog function, the DSG and CHG MOSFETs will be turned off. Will the BQ769142 automatically Reset when triggered?

3, Is it possible to disable the Watchdog function when entering sleep mode, and then enable the Watch dog function after waking up from sleep mode?

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 18090 points

    Hi Star,

    Star Xu said:
    The BQ769142 sets the parameters then is completely powered off. At this time, after powering on, will the values ​​become the default values ​​or will they remain the setting values?

    When the device is powered on or woken from SHUTDOWN mode, it will load the settings set in the OTP, and if there is no OTP value set for a register it will load its default value.

    Star Xu said:
    When BQ769142 triggers the watchdog function, the DSG and CHG MOSFETs will be turned off. Will the BQ769142 automatically Reset when triggered?

    The Host Watchdog Protection just turns off the FETs, it will not directly cause the device to reset. The internal watchdog feature (not the same as Host Watchdog Protection) will reset the device. This feature checks if the internal firmware is non-responsive and should only trigger if there is an internal firmware error.

    Star Xu said:
    Is it possible to disable the Watchdog function when entering sleep mode, and then enable the Watch dog function after waking up from sleep mode?

    There is not an autonomous function to do this, but the host could detect that the device is in SLEEP mode via 0x12 Battery Status [SLEEP] and then disable the Host Watchdog Protection by changing Settings:Protection:Enabled Protections C [HWDF] to disable/enable the protection. The Internal Watchdog check cannot be disabled.

    Regards,

    Max Verboncoeur