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AM5726: GP EVM pulldown resistor on CAP_VDDRAM_MPU1

Charles McCarthy
Intellectual 500 points
Part Number: AM5726


Hi.  I'm looking at the AM572x General Purpose (GP) EVM schematic v.A3a (pp.9) and it shows a 220Ω (R417) pull-down on the CAP_VDDRAM_MPU1 pin (K16).  What's the purpose of this PD?  Is it supposed slow the rise time of the internal SRAM supply?  Is it necessary?

Thanks,

Charles McCarthy

  • 0
    TI__Guru**** 393215 points
    Hi,

    It seems this pulldown is left over from earlier board designs, possibly with SR1.1 devices. Its primary purpose is to discharge the capacitor quickly when power is removed. I don't see it on later designs, e.g. the AM572x IDK, so I assume that it's not necessary.