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TPS65219: Reset pin behavior

Ryu Yamashita
Genius 3985 points
Part Number: TPS65219


Hi team,

The ACTIVE state is defined as ‘the state where all valid buck converters and LDOs are operating’. Therefore, we consider that a RESET request becomes effective only after the power-on sequence is complete and the device enters the "ACTIVE state".
To ensure the configuration does not transition to the "STBY state", I consider the RESET pin to be active only in the "ACTIVE state".

The MODE/RESET setting is used as the RESET pin and is pulled up in Buck 2.
Is our understanding of the active and inactive periods for the RESET request in the timing chart below correct?
I consider the yellow portion to be the active period.
Is it acceptable for the RESET pin to temporarily fluctuate from L→H→L during sequencing down?

2025-10-14 115902.png

 

Best Regards,
Ryu.

  • 0
    TI__Genius 11537 points

    Hi Ryu, 

    RESET requests are only valid during ACTIVE, STANDBY, or transition between these two states.
    The fluctuation during sequence down transition between ACTIVE and INITIALIZE is fine, and will not be processed as a new request. 

    However, can you help me understand why your RESET pin is pulled HIGH when buck 3 turns off?

    Best Regards, 
    Sarah