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Apparatus for providing communications data over a power bus having a total current that is the absolute value of the most negative current excursion during communication

  • US 6,694,439 B2
  • Filed: 12/15/2000
  • Issued: 02/17/2004
  • Est. Priority Date: 06/07/2000
  • Status: Expired due to Fees
First Claim
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1. A bus-powered device comprising:

  • a signal processing control circuit connected to and powered by a bus at a predetermined operating current; and

    a bus current modulator circuit interconnected in series with said signal processing control circuit to the bus for providing a bipolar communication signal;

    the total series current of both said circuits being only said predetermined operating current of said signal processing control circuit or the absolute value of the most negative current excursion during communication, whichever is greater.

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