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AM4372: Power-up sequence

Part Number: AM4372

Hi champs,

I have a question about AM4372 power sequence.

In datasheet, P.129.  Figure 5-8. Simplified Power Sequencing With RTC Feature Disabled, Dual-Voltage IOs Configured as 3.3 V

It seems that it is power up in order.

I think it is no problem that 1.8V power up timing and 1.2V/1.35V/1.5V power up timing are the same timing.

And I think it is no problem that 1.2V/1.35V/1.5V power up timing and 1.1V power up timing are the same timing.

So is there a problem with the 1.8 V power-up timing and the 1.1 V power-up timing at the same timing?

Regards,

Shinji Ueda

  • HI,

    Your design must comply with the power up sequence provided in the datasheet.
    Follow the power-up sequence, as provided in Figure 5-8. Simplified Power Sequencing With RTC Feature Disabled, Dual-Voltage IOs Configured as 3.3 V.

    There is no problem to ramp 1.8V and 1.2V/1.35V/1.5V at the same time, but the 1.1V supply must ramp AFTER the 1.8V power supply, as stated in Figure 5-8.

    Best Regards,
    Yordan