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UCD9222, UCD7242 for 2x C667x

Wenjun Huang
Expert 1770 points
Other Parts Discussed in Thread: UCD9222, UCD7242

I am intending to use 2x C667x DSP on my boards. The Hardware User Guide shows the schematic for UCD9222, UCD7242 for DSP C6616. I was wondering could I replace the 2x C6616 with my 2x C667x DSP.

I should be using Configuration2 with 1x UCD9222, 2x UCD7242 in order to provide 20A per rail as I use the power estimation excel sheet with C6678 and calculate the CVDD to be 12A for 1x C6678. I believe I am overestimating the current requirement of 12A for 1x C6678 hence the 20A should be sufficient.

Btw, I realize when I switch the power estimation excel sheet from power to current in the variable field, the CVDD1 column does not change. I believe your side may have made an error in doing the macro for the excel sheet.

  • 0
    TI__Guru* 84110 points

    Wenjun,

    The DSP in the HW Design Guide is the TCI6616 but the power solution is the same for the C6678 thanks to the consistency of the Keystone Devices.

    I will suggest that the spreadsheet is correct to report the same number for X mW @ 1.0V and for X mA @ 1.0V. You will agree with that, I hope, based on the equation for Power = Voltage * Current.

    Regards,
    RandyP

  • 0 in reply to RandyP
    Expert 1770 points

    Oh ya, u r right. I was misleaded as all the other column is changing, even the CVDD column. I realize that the CVDD uses 0.9V for worst case current estimation.