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Original question:

DP83TC814S-Q1: EMI Issue

DP83TC814S-Q1: About the Power supply and startup configuration pull up Power

Jingkun Wang
Intellectual 290 points
Part Number: DP83TC814S-Q1

Tool/software:

Hello TI team,

Does it have the risk if the power rails are different between power supply and startup configuration pull-up power?

For example,  the VDDA_1/2,VDDMAC, VDDIO is supplied from SYS_3.3V;  the startup configuration pull-up power is supplied from CPU_3.3V.

And the CPU_3.3V stable time is before SYS_3.3V.

Best Regards!

Wang Jingkun

  • 0
    TI__Genius 14005 points

    Hi Jingkun,

    The strap resistors should normally be tied directly to VDDIO.

    These are the power supply timing requirements, mentioned in the datasheet section 7.6: The maximum delay offset between all supplies is 10ms.

    Best regards,

    Melissa