Doc Type: Patent Application

Low Power Magnetic Field Sensor

Abstract

A magnetic field sensor for low power applications includes a magnetic field sensing element that, during sample intervals, provides a signal proportional to a sensed magnetic field and also includes a comparator circuit that, during the sample intervals, compares the magnetic field signal to threshold levels to generate a sensor output signal indicative of a strength of the magnetic field. According to a dual sample rate feature, initially the magnetic field signal is sampled at a first predetermined sample rate and, following detection of a transition of the sensor output signal, is sampled at a second, faster predetermined sample rate for a predetermined interval. According to a user-programmable sample rate feature, a user may operate the sensor at a fixed, predetermined sample rate or at a user-specified sample rate. The magnetic field sensor may detect the speed and/or direction of rotation of a rotating magnetic article.


Claims
Download PDF
Document Preview
Document History
  • Publication: Dec 31, 2008
  • Application: May 5, 2008
    WO US 2008/0062620 W
  • Priority: Jun 25, 2007
    US US 76754907 A

Sign in to the Lens