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"AM3358BZCZ100" power supply.

Burt Ran
Prodigy 90 points

 I have some questions about power design.

 Processor is "AM3358BZCZ100" and PMU is "TPS65910A3A1RSL" , using DDR3

We should provide different voltage to processor according to processor frequency

(1)I need your confirmation for "AM3358BZCZ100" power supply.

VDD_MPU : 1.325V      yes or no
VDD_CORE: 1.1V         yes or no

(2) I am not sure VDD_MPU is 1.1V is also meet requirements if using AM3358BZCZ100.

  • 0
    TI__Guru**** 393215 points

    Hi Burt,

    Linux should handle this automatically depending on the operating frequency chosen. Just make sure you connect both I2C and SR pins of the PMIC to I2C0 of the processor.

  • 0 in reply to Biser Gatchev-XID
    Prodigy 90 points

    Yes, I got.

    For PMIC the default value is 1.1V for VDD_MPU and VDDMPU when selecting EEPROM mode. your means is that is ok for processor AM3358BZCZ100 in spite of its work frequency is 1GHz. Why?

    I am not sure when power on processor  AM3358BZCZ100 it start working on lower frequency ,maybe it is 500Mhz, so, 1.1V core and MPU voltage are all ok for it.

    And later if it want to work on high frequency , it will handle PMIC through I2C, and change register and get different voltage and meet high frequency.

    Do you agree my understand? Could you give me explanation if I made mistake. Thanks

  • 0 in reply to Burt Ran
    TI__Guru**** 393215 points

    Yes, this is correct. The processor inits at MPU frequency 500MHz. Everything else is handled once the initial software is loaded and starts executing.