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Interface circuitry

  • US 6,538,472 B1
  • Filed: 05/02/2001
  • Issued: 03/25/2003
  • Est. Priority Date: 05/02/2001
  • Status: Active Grant
First Claim
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1. Interface circuitry for an automobile electronic control unit diagnostic scanner, comprising:

  • a first resistor;

    a second resistor;

    a transistor array;

    wherein said first resistor is connected at a first end to a collector of a first transistor of the transistor array;

    wherein said second resistor is connected at a first end to a collector of a second transistor of the transistor array;

    wherein said first and said second resistors are connected at their second ends to a first pin of an link connector; and

    wherein a plurality of resistance values can be provided at the first pin of the link connector by biasing a base of the first transistor, the second transistor and a base of both transistors.

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