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AM6442: VDD_CORE and VDDS_DDR related to OPP?

Part Number: AM6442
Other Parts Discussed in Thread: TPS6521815

how to determine the core voltage and DDRs_DDR_xxx voltage?

Can single TPS6521815 power AM642x? if not, why? no enough power rail for DDR4?

  • Two operating voltages are supported for VDD_CORE. You can eliminate the 0.75V supply rail by operating VDD_CORE at 0.85V. However, operating the core at 0.85V increases power dissipation relative to operating the core at 0.75V. Providing two core operating ranges allows the system designer to decide if they prefer to decrease power dissipation at the cost of providing the additional 0.75V power rail.

    Two voltage ranges are defined for VDDS_DDR and VDDS_DDR_C to support two memory types, DDR4 and LPDDR4. The operating voltage of these rails will depend on the memory type selected.

    I'm not familiar with capabilities of TPS6521815.  You should use the System Configuration Tool to assign and partition your IOs.  This will help you understand how many power rails are required for each operating voltage. Then run the Power Estimator Tool to get a better estimate of the expected power consumption for each rail. Once you have this information you can ask the PMIC team to help you select the appropriate power source for your system.

    Regards,
    Paul