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DaVinci DVDD Power Rails

Koby Kluger
Prodigy 140 points

In the DaVinci power-calculator, there are two power-rails columns named DVDD 3.3 and DVDD 1.8V which cannot be edited.

For some of the modules (e.g. DSS) it appears that they use both voltages.

Is it possible that some of the DaVinci modules, powered from DVDD, require 3.3V and cannot be powered only by 1.8V ?

  • 0
    TI__Guru**** 170625 points

    Koby,

    The DM814x device supports dual voltages on some of its I/Os. These I/Os are partitioned into the following groups, and each group has its own dedicated supply pins: DVDD, DVDD_GPMC, DVDD_C, and DVDD_SD. The supply voltage for each group can be independently powered with either 1.8 V or 3.3 V.

    Koby Kluger said:
    Is it possible that some of the DaVinci modules, powered from DVDD, require 3.3V and cannot be powered only by 1.8V ?

    I can find in DM814x datasheet, that only USB (VDDA_USB_3P3) require 3.3V and can not be powered from 1.8V.

    Best regards,
    Pavel

  • 0 in reply to Pavel Botev
    Prodigy 140 points

    My question related to internal modules and not I/O ports.

    I am still puzzled about estimating power consumption of the internal modules, under several voltages, using the

    power-calculator.

  • 0 in reply to Koby Kluger
    TI__Guru**** 170625 points

    Koby,

    DVDD and DVDD_x are power supply for I/Os.

    See DM814x datasheet, section 7.2.5 Dual Voltage I/Os and 3.2.26 Supply Voltages

    Refer also to the below wiki page:

    http://processors.wiki.ti.com/index.php/DM814x_AM387x_Power_Estimation

    Regards,
    Pavel