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DM3730 :question of power sequence (MMC1 dual power supply)

sumiko
Intellectual 2060 points
Other Parts Discussed in Thread: DM3730

Champs,

Please let me clarify the power sequence of DM3730.

My customer plans to use the dual power supply for MMC1 port : 1.8V for VDDS_X and 3V for VDDS_MMC1.

According to the datasheet, when applying the diffrent voltage for VDDS_X and VDDS_MMC1 , it says that VDDS_X should be applied at last with VDDS_MMC1.

Here is my question. 

1) Should VDDS_X be applied the dedicated 1.8V power (not same power with vdds_sram, not same with other 1.8V supply) ?

2) Is there any power sequence rule for VDDS_MMC1 and VDDS_X ? Is either power supply sequence (VDDS_MMC1 first ? or VDDS_X first ? ) acceptable ?

  • 0
    TI__Intellectual 2060 points

    Champs, any update on this ?

    If 1) is yes, the user must prepare the different 1.8V supply from vdds_sram , and this would have much impact.

    Regards,

    Sumiko Yamaji

     

  • 0
    TI__Genius 16690 points

    sumiko said:
    1) Should VDDS_X be applied the dedicated 1.8V power (not same power with vdds_sram, not same with other 1.8V supply) ?

    Please refer to the note in the section "3.5 Power-Up and Power-Down Sequences".

    sumiko said:
    2) Is there any power sequence rule for VDDS_MMC1 and VDDS_X ? Is either power supply sequence (VDDS_MMC1 first ? or VDDS_X first ? ) acceptable ?

    These power rails can be turned on/off by the software when necessary. Therefore there is no sequence required between these power rails.