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LP5817: Register states after exiting Shutdown Mode

Marvn Arcangel
Genius 16470 points

Part Number: LP5817

Hi Experts,

I need clarification regarding the register behavior of LP5817 after exiting shoutdown mode via thermal shutdown or user driven.

Are the configuration register reset to default values when LP5817 exits shutdown? 

A scenario would be something like this:

Power on -> configure registers -> drive some LED patterns -> go to shutdown -> exit shutdown -> Reconfigure registers or not needed? -> drive some LED patterns.

Regards,

Marvin

  • 0
    TI__Genius 11391 points

    Hi Marvin,

    Our expert will reply to you tomorrow. Thanks for your patience!

    Best regards,

    Suchen Dong

  • 0
    TI__Genius 11610 points

    Hi Marvin,

    There will be difference between thermal shutdown and user-driven shutdown.

    1. User drive shutdown exit -> routes through INITIALIZATION -> register reset.

    2. Thermal shutdown recovery -> transitions directly back to STANDBY/NORMAL mode (when Tj drops below TSD - TSD_HYS) without passing through INITIALIZATION. In this case, registers should be preserved, but you'll need to clear the TSD flag manually via the TSD_CLR bit.

    So for thermal shutdown specifically, registers are likely retained since the device doesn't re-initialize. However, for user-driven shutdown, reconfiguration is mandatory. 

    You can refer to more details on DS page15 Fig7-4 Functional Modes.

    Regards,

    Emma Wu