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TPS6521905: Application issues of chips

Tonyx.wu
Expert 2555 points
Part Number: TPS6521905
Other Parts Discussed in Thread: TPS65219

May I ask, if TPS6521905 detects RV during ON startup, it will terminate the startup. Is there a way to avoid this?

  • 0
    TI__Mastermind 18815 points

    Hi,

    Thanks for reaching out. The TPS65219 PMIC performs two residual voltage check; one before the start of the power-up sequence and a second one during the power-up sequence (on each power-up slot, right before each rail is turned ON). 

    The first residual voltage check can be bypassed by reprogramming the "BYPASS_RAILS_DISCHA RGED_CHECK" register field on address 0x1E (bit#7). The second residual voltage check cannot be disabled. 

    If the voltage on the output is not a residual voltage but instead an external voltage that is actively being forced to the PMIC, then the power-up sequence will be aborted. All the output voltages must discharge below the SCG threshold (approximately 260mV) for a successful power up sequence. before they are turned ON. 

    Thanks,

    Brenda