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Drive current calibration for an analog resistive touch screen

  • US 5,717,321 A
  • Filed: 01/17/1995
  • Issued: 02/10/1998
  • Est. Priority Date: 01/17/1995
  • Status: Expired due to Term
First Claim
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1. A method for controlling power supplied to a load resistance, the method comprising the steps of:

  • converting a digital control value to a current supplied to said load resistance, to thereby produce a voltage across said load resistance;

    comparing said voltage across said load resistance to a desired voltage to produce a comparison signal; and

    adjusting said digital control value in response to said comparison signal so that said voltage across said load resistance becomes substantially equal to said desired voltage, wherein said digital control value is adjusted in response to said comparison signal by successively adjusting individual bits of said digital control value beginning with a more significant bit of said digital control value and ending with a less significant bit of said digital control value.

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