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Free-fall detection device and free-fall protection system for a portable electronic apparatus

DC
  • US 7,450,332 B2
  • Filed: 06/24/2005
  • Issued: 11/11/2008
  • Est. Priority Date: 06/28/2004
  • Status: Active Grant
First Claim
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1. A free-fall detection device for a portable apparatus comprising:

  • an acceleration sensor generating first, second, and third acceleration signals correlated to a respective component of a sensed acceleration along a respective detection axis; and

    a free-fall detection module coupled to said acceleration sensor, wherein said free-fall detection module is configured to carry out a comparison between each one of said first, second, and third acceleration signals and a respective acceleration threshold, and to generate a free-fall detection signal according to the result of all three comparisons, wherein said free-fall detection signal has a first logic value indicative of a free-fall condition in the event that said first, second and third acceleration signals are all simultaneously lower than the respective acceleration threshold.

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