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TMS320C6746: Power Rails

Nadeem Zaki
Prodigy 150 points

Part Number: TMS320C6746

Hello,

  1. We are planning to use the C6746 DSP on a new board and I was wondering if there are any caveats to using different power rails for the different power groups.  Specifically, I would like to use 2.75V for Power Group A (because of a UART requirement) but use 3.3V for the rest of the device. Is this a problem?  Is there a power sequencing requirement if we use different rails for the different power groups?
  2. Looking at the power on sequencing (§5.3.1) of the datasheet, it seems that the only valid voltages for the IO supply groups are 1.8V and 3.3V.  Can you confirm this is the case?
  3. Is there any work around that can enable use of a 2.75V rail?

Best,
Nadeem

  • 0
    TI__Guru 65405 points
    Hi Nadeem,

    The team is notified. They will post their feedback directly here.

    BR
    Tsvetolin Shulev
  • 0
    TI__Guru**** 161600 points
    Hi Nadeem,

    We are planning to use the C6746 DSP on a new board and I was wondering if there are any caveats to using different power rails for the different power groups. Specifically, I would like to use 2.75V for Power Group A (because of a UART requirement) but use 3.3V for the rest of the device. Is this a problem? Is there a power sequencing requirement if we use different rails for the different power groups?


    This should not be done. See Section 5.3 Recommended Operating Conditions from the device datasheet: www.ti.com/.../tms320c6746.pdf. Power group A, can be in the range of 1.71V to 1.89V in the case of 1.8V mode and from 3.15V to 3.45V in the case of 3.3V mode. So you CANNOT use 2.75V.

    2. Looking at the power on sequencing (§5.3.1) of the datasheet, it seems that the only valid voltages for the IO supply groups are 1.8V and 3.3V. Can you confirm this is the case?

    Yes, as I said above you can use 1.8 or 3.3V. See Section 5.3 Recommended Operating Conditions from the device datasheet.

    3. Is there any work around that can enable use of a 2.75V rail?

    I am not aware of any. The datasheet's recommended operating conditions need to be followed strictly.

    Best Regards,
    Yordan