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AM1808 Power-On Sequence

Daisuke Maeda
Guru 20215 points
Other Parts Discussed in Thread: AM1808

For the AM1808 Power-On Sequence:

 - The device should be powered-on in the order described in the datasheet.

 - There is no specific required voltage ramp rate for any of the supplies as long as the LVCMOS supplies operated at 3.3V (DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed the STATIC 1.8V supplies by more than 2 volts.

If the power supplies reach their nominal values in the order described in the datasheet, can the power supplies be powered-on at the same time?

Best regards,

Daisuke

 

  • 0
    TI__Expert 4760 points

    HI Daisuke,

    There is no exact timing spec for the power up sequence .Any realistic delay should be fine between the rails, instead of powering up all the rails together.

    Please refer the below E2E thread

    http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/p/108307/382749.aspx#382749

    Regards

    Antony

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  • 0 in reply to Antony Samsunil
    Guru 20215 points

    Hi Antony,

    Thank you for your reply.

    It became clear that the powering up all the rails together is not allowed.

    Paul said: "Basically, we need the 1.2 ramped up to the nominal level before you start ramping up 1.8V."

    Tommy said: "The datasheet sequence assumes that each supply group reaches the target voltage before the next supply is powered up in the order specified."

    Best regards,

    Daisuke