Magnetic field sensor with an adjustable threshold

A method for detecting motion of an object with a magnetic field sensor, comprising:

• generating a magnetic field signal with one or more magnetic field sensing elements, the magnetic field signal indicative of the motion of the object;
• generating a threshold signal at a first level when a peak-to-peak value of the magnetic field signal is greater than a first predetermined value and at a second level when the peak-to-peak value of the magnetic field signal is less than a second predetermined value different than the first predetermined value, wherein the first level and second level of the threshold signal are each different respective percentages of the peak-to-peak value of the magnetic field signal;
• and
• comparing the magnetic field signal to the threshold signal to generate a comparison signal having transitions occurring when the magnetic field signal crosses the threshold signal.

A magnetic field sensor, comprising:

• means for generating a magnetic field signal with one or more magnetic field sensing elements, the magnetic field signal indicative of motion of an object;
• means for generating a threshold signal at a first level when a peak-to-peak value of the magnetic field signal is greater than a first predetermined value, at a second level when the peak-to-peak value of the magnetic field signal is less than a second predetermined value different than the first predetermined value, and at a third, variable level when the peak-to-peak value of the magnetic field signal is between the first and second predetermined values, wherein the first level and second level of the threshold signal are each different respective percentages of the peak-to-peak value of the magnetic field signal;
• and
• means for generating a sensor output signal based on a comparison of the magnetic field signal to the threshold signal.