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[C5535] Power supply during RTC-only mode

Kaka
Guru 24520 points

Hi community member,

Please let me confirm the following question just in case.

[Question]

 Is there any problem for supplying the power to DVDDIO during RTC-only mode?

If you have any questions, please let me know.

Best regards.

Kaka

  • 0
    TI__Genius 12575 points

    Hi Kaka-San, 

    To achieve the lowest power in RTC only mode, except for The RTC Core (CVDDRTC), RTC I/O (DVDDRTC), and LDO inputs (LDOI), all other power domain including DVDDIO can be totally shutdown. Otherwise we may not be able to achieve the specified  low power in RTC only mode.

    Hope this helps. 

    Regards

     Vasanth

  • 0 in reply to Vasantha K
    Guru 24520 points
    Hi Vasanth,

    Thank you for comments.
    I know that we can be removed the DVDDIO in order to achieve the lowest power consumption in RTC-only mode.
    My customer would like to know whether there is any problem to provide the power for DVDDIO even though the power consumption will increase.

    In my understanding, there is not problem for this design except for increasing the power consumption in RTC-only mode.
    Is my understanding correct?

    Best regards.
    Kaka
  • 0 in reply to Kaka
    TI__Genius 12575 points

    Hi Kaka-san, 

    This hasn't been verified ( supplying DVDDIO in RTC ONLY mode), as RTC only mode is meant to achieve low power mode by shutting off all power domain except for The RTC Core (CVDDRTC), RTC I/O (DVDDRTC), and LDO inputs (LDOI). Since this is not verified/characterized for this usage scenario, if this scenario is used (by supplying DVDDIO in RTC only mode), it would be at customers own discretion.

    Hope this clarifies.

    Regards

     Vasanth

      

  • 0 in reply to Vasantha K
    Guru 24520 points

    Hi Vasanth,

    Thank you for your response.
    I had a similar question on E2E, I had heard as below.
    ***************
    The defination of RTC-Only mode requires LDOI, DVDDRTC and CVDDRTC to be powered. Rest of the power domians CAN BE powered off to achieve the lowest power saving. It is NOT a requirement to power off DVDDIO, USB_VDDOSC, USB_VDDA3P3, USB_VDDPLL during RTC only mode
    ***************
    e2e.ti.com/.../416246
    And datasheet showed this as below.

    >> All other power domains can be totally shut down when using RTC-only mode.

    So, I understood that there is not problem for this design except for increasing the power consumption in RTC-only mode.

    Best regards.
    Kaka

  • 0 in reply to Kaka
    Guru 24520 points
    H Vasanth,

    Would you please provide answer for this?

    Now my customer think that provide 1.3V to the USB_VDD1P3 and USB_VDD1P3 by external LDO.
    So, their system keep to provide those power even though the system is in RTC-only mode.
    I would like to know whether there is any problem for this system.

    Best regards.
    Kaka