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PMP6776 / Power Sequencing for Kintex7

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: PMP6776
Hello,
 
In the PMP6776 schematics, I can't find any sequencing description.
But , I think that Kintex7 need Power Sequencing due to below Kintex 7's  datasheet page 6.
 
Power UP order(down is reverse of below)
VCCINT--> VCCBRAM --> VCCAUX --> VCCAUX_IO --> VCCO
 
<1>
Is PMP6776 considered above sequencing?
 
<2>
Could you please kindly let me know recommend TI's sequencer device for Kintex 7 ?
 
Best Regards,
Ryuji Asaka
  • 0
    TI__Guru**** 191445 points

    I have forwarded your request to the PMP6776 design engineer.  He will try to answer later today.

  • 0
    TI__Expert 4760 points

    Hi Ryuji,

    The timing sequence of PMP6776 is designed according to the following spec:

    "

    Sequencing on the power module will be required to be compliant with Kintex 7 specifications.  1.8V (Vccaux) must come up first, followed by 2.0V (Vccaux_io), then Vcco.  The key to this sequence requirement is that Vccaux must reach its final regulation voltage before Vccaux_io can exceed Vccaux.  Likewise, Vcco cannot exceed Vccaux_io until Vccaux_io reaches it’s final regulation voltage.  Based on this requirement, tracking the supplies is also permissible as long as Vccaux is not exceeded by Vccaux_io and Vccaux_io is not exceeded by Vcco during initial ramp.

     

    Each supply must ramp monotonically between 20-50ms.  Because the startup time is so slow, the inrush current from starting supplies simultaneously should not be an issue. "

    Hope that's helpful.

    Regards,

    Sheng-Yang Yu

  • 0 in reply to Sheng-yang Yu1
    Prodigy 130 points

    Hi

    what about VCCINT & VCCBRAM ?

    according to the Kintex 7 specification those two rails have to be set first .

    VCCINT, VCCBRAM, VCCAUX, VCCAUX_IO, and VCCO

    Best regards.

    Paulo.

  • 0 in reply to paulo barroso
    TI__Expert 4760 points

    Yes, the sequence of Vccint & Vccbram (1V) > Vccaux (1.8V) > Vccaux_io (2.0V) > Vcco is designed in PMP6776.

    Please see the PMP6776 test report page 3 as follows:

    http://www.ti.com/lit/ug/tidu046/tidu046.pdf

    Regards,

    Sheng-Yang Yu