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BQ76952: shutdown function

Che Liu
Prodigy 100 points
Part Number: BQ76952

Dear：

        After the RST pin is pulled high, I suddenly don't want to shut down.
       I pulled down the RST pin again, how can I rescue it most effectively?
       What is the approximate range of the dead zone that will shut down without recovery?
       When the RST pin is pulled high and then pulled low, how long does it take to shut down?

      Best regards

      Che Liu

  • 0
    TI__Prodigy 720 points

    Hi Che,

    When using the RST_SHUT pin, if it is pulled high for greater than 1 second then it will begin to enter SHUTDOWN mode. If the pin is pulled high for less than 1 second, it will either exit SLEEP MODE or DEEPSLEEP MODE (if in the states to begin with) or do a 'soft' reset (registers are not cleared and FETs are still active) if in Normal Mode. This is not the recommended method if you want to Reset the device. 

    Back to your questions, if you trigger the start of the SHUTDOWN Mode via pulling the RST_SHUT pin high for greater than 1 second there is no way to recover it from going into this mode. It can be delayed by using the SHUTDOWN COMMAND DELAY (section 13.4.1.7 Power:Shutdown:Shutdown Command Delay) and the FET Off Delay. But, after these delays, it will enter the Shutdown mode. There will be latency between device issuing the Shutdown mode and the device actually going into Shutdown mode but we do not have a definite answer.

    Hope this helped.

    Best regards,

    Andrew