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Automatic on-chip detection of power supply configuration-modes for integrated chips

  • US 8,324,756 B2
  • Filed: 10/06/2008
  • Issued: 12/04/2012
  • Est. Priority Date: 10/06/2008
  • Status: Active Grant
First Claim
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1. An integrated circuit device capable of being powered by either an internal power supply or an external power supply, comprising:

  • an internal power supply;

    a node coupled to the internal power supply and capable of being coupled to an external power supply;

    a power management system for detecting whether an external power supply is coupled to said node during start-up of the integrated circuit device prior to enabling the internal power supply, the power management system including;

    a discharge circuit for discharging the node for a predetermined discharge time during start-up of the integrated circuit;

    a comparator coupled to the node for determining during the predetermined discharge time whether the node is driven by an external power supply and providing a first output signal when the node is driven by an external power supply and a second output signal when the node is not driven by an external power supply.

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