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66ak2g02: Difference between CVDD and CVDD1

Debora
Intellectual 645 points

Part Number: 66AK2G02
Other Parts Discussed in Thread: 66AK2G02

On the K2G EVM, why are CVDD and CVDD1 separate supplies, each with their own PMIC output, inductor, cap, etc.?  Perhaps they were separated on the K2G EVM only because previous Keystone parts used adaptive voltage scaling on CVDD (as described in SPRABV0 section 2.2.1)?  

I see that on the K2G ICE, CVDD and CVDD1 are sourced by a single regulator. I would like to save the cost of the extra inductor, cap, etc. etc. if it is OK to connect them together and drive them both from the TPS659118 Vddctrl switcher.

Can you confirm that it is OK to power both rails from the same regulator on the 66AK2G02?

  • 0
    TI__Guru**** 161600 points
    Hi,

    On the K2G EVM, why are CVDD and CVDD1 separate supplies, each with their own PMIC output, inductor, cap, etc.? Perhaps they were separated on the K2G EVM only because previous Keystone parts used adaptive voltage scaling on CVDD (as described in SPRABV0 section 2.2.1)?


    I am not aware of the reason for dividing this to CVDD & CVDD1.

    Can you confirm that it is OK to power both rails from the same regulator on the 66AK2G02?


    If your regulator can handle the load for both power rails (CVDD & CVDD1), I think this shouldn't be a problem. From Figure 5-1. Power-Up Sequencing, you can see that both CVDD & CVDD1 are started simultaneously, so you should be able to combine those power rails.

    I am looping the K2G hardware designer to confirm/correct my understanding.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    TI__Guru**** 161600 points
    Hi,

    I found the confirmation in the Schematic checklist (www.ti.com/.../sprac54.pdf):
    Section 2.2.2 Discrete Power Supplies

    • If the voltage level selected for CVDD and CVDD1 are the same, these pins may be driven by a single power supply. Include the current requirements for both rails when specifying the power supply.

    Best Regards,
    Yordan