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Question about TCI6638K2K SoC power supply

Ettore Montanari
Genius 3290 points

Hello,

On 6638K2K SoC  we have for CVDD1 power supply two differents PINs group, one group dedicated to ARM corepacs and the other for DSP corepacs.  In case we are sure to give all the required SoC Ampere currents for the total CVDD1 (ARMs + DSPs), can we use a single power supply DC-DC converter to source them ?   Looking to the advantech K2K/K2H EVM we see that they use two different DC-DC converters: one dedicated to ARM cores CVDD1 pins and the other for the DSP cores CVDD1 pins so in order to be sure about our single DC-DC solutions (for our card) we prefer to ask you.


Best Regards
Ettore

  • 0
    TI__Mastermind 43660 points
    Hello Ettore,

    Yes, if you can source SoC CVDD current requirement, you can use single CVDD power supply in your design. Please note, two parallel power supply's implemented on the EVM were originally included to support separate power sources for the ARM core supply and the DSP core supply. Those supply rails were combined in the final version of the K2H but the EVM design could not be changed to support a single supply for that combined rail.

    A similar query is addressed earlier in the below thread.

    e2e.ti.com/.../395850

    Regards,
    Senthil
  • 0 in reply to Senthilkumar Srinivasan
    Genius 3290 points
    Hello Senthil,
    thanks for the answer but my question was related to the sharing of the CVDD1 pins and CVDD1T pins from the same power supply (and not about AVS CVDD ). In last Advantech CVDD1 and CVDD1T are sourced from two different DC-DC even if their voltage is the same (0.95V fixed) but in our design can we share same supply source for all CVDD1 pins and CVDD1T pins ?

    Thanks
    Regards
    Ettore
  • 0 in reply to Ettore Montanari
    TI__Mastermind 43660 points
    Hello Ettore,

    Yes, you can connect both CVDD1 and CVDD1T to the single power supply provided the current requirements are met. Please refer Figure 1 KeyStone II Power Supply Planes (Rails) and section 2.2.3 CVDDT1 in Keystone 2 Hardware Design Guidelines for better clarity.

    www.ti.com/.../sprabv0.pdf

    Regards,
    Senthil