System clock counter counting ring oscillator pulses during programmed value
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United States of America Patent
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Sep 1, 2015
Grant Date -
May 23, 2013
app pub date -
Jan 9, 2013
filing date -
Jan 13, 2011
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Abstract
A method of programming a ring oscillator for use as a temperature sensor comprises selecting an initial number of delay elements for use in a ring oscillator. The method further comprise starting a system clock counter and counting pulses of the ring oscillator until the system clock counter reaches a programmed value. The method also comprises determining whether a number of counted ring oscillator pulses is between lower and upper count thresholds and changing the number of delay elements for the ring oscillator as a result of the number of counted ring oscillator pulses being less than the lower count threshold or greater than the upper count threshold.
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