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DS90UB927Q-Q1: DS90UB927-Q1 Power up sequence

Anthony Yoo68
Expert 1320 points
Part Number: DS90UB927Q-Q1

Hi

DS90UB928-Q1 contains the Power up sequence. However, the DS90UB927-Q1 does not include this. 928 states that VDDIO and VDD33 should be supplied with 100 us first when supplying VDDIO and VDD33 to a separate power source, and that VDDIO and VDD33 should be supplied with the same power at the same time. Is there no need to consider this sequence in the case of 927?If it is necessary for 927 too, can you advise me if the PDB can power up with the correct sequence only after the VDDIO and VDD33 power is stabilized a while later?

Please check it.

Thank you

Best Regards

From Anthony.

  • 0
    TI__Guru** 103215 points

    Hello Anthony,

    For 927 see datasheet section 9. There is no specific sequence for VDDIO/VDD33, but each supply should ramp with monotonic rise, and faster than 1.5ms. PDB must be applied after both supplies are stable. 

    Best Regards,

    Casey