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DS92LV2412 power-up sequence

toshi-e2e
Genius 4705 points
Other Parts Discussed in Thread: DS92LV2412

Hi all,
According to the datasheet of DS92LV2412, there is no power-up sequence between Vddn(1.8V) and Vddio(3.3V).

When the power up sequence is the following waveform, is there any problem?

Regards,
Toshi

  • 0
    TI__Mastermind 29635 points
    Hi Toshi-san,

    Power requirements are found in Section 9.2.2.2 of the datasheet. Since your VDDIO supply is ramping slower than 1.5 ms, please ensure that there is a capacitor on the PDB pin so that PDB arrives after all VDD supplies have settled at the recommended operating voltage. A 10kOhm and 22 uF cap to GND will help delay the PDB input signal.

    There may be issues if the PDB pin is pulled high before all VDDn and VDDIO supplies reach the appropriate levels.

    Thanks,

    Michael