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Output current from the DM365 Power terminals in Power-On

Our customer watches the reverse current (the peak current is -92mA) on the 3.3V power rail that connected to the 3.3V I/O power terminals of DM365, when the 3.3V power starts to be ramped up.

 

The power on steps are followed in sequential order for the simple power-on method.

 

Can the DM36x output this reverse current? Is this the leakage current that come through a leak path in DM365?

Best regards,

Daisuke

 

  • Hi,

    Do the switchable 3.3/1.8-V power supplies (VDD_AEMIF1_18_33, VDD_AEMIF2_18_33, VDD_ISIF18_33) have a leak path when the 3.3V power starts to be ramped up after the 1.35V power and the 1.8V power have been ramped up?

    All switchable 3.3/1.8-V power terminals (VDD_AEMIF1_18_33, VDD_AEMIF2_18_33, VDD_ISIF18_33) are operated as 3.3V, and all 3.3V power terminals connect to one 3.3V power rail.

    Please give me an answer as soon as possible. Your prompt reply would be appreciated.

    Best regards,

    Daisuke

  • Hi,

    I checked on the EVMDM365 (Revision D).

    support.spectrumdigital.com/.../revd

     

    During the 1.8V ramp the undriven 3.3V rail drifts up. It may be caused by a leak path between the power terminals in DM365.

    After the 3.3V is turned ON with 80% (1.44V) detection on 1.8V, there is a reverse current on the 3.3V power rail, but it seems to be a sink current by the DC/DC converter.

    Is there a leak path between the power terminals in DM365 in Power-On? What is the maximum current which come through the leak path?

    Please give me an answer as soon as possible. Your prompt reply would be appreciated.

    Best regards,

    Daisuke