Patent ID: 9383186
Filing Date: 2016-07-05
CPC Classification: G01B,G01D,G01R

Claim Text:
1. A method for sensing rotation and angular position using a plurality of magnetic field sensing elements on a single integrated circuit comprising iteratively tracking of the orientation of a rotating movable magnetic target the method comprising: i. separating a 360° sensor carrying area into two halves, calculating a summation signal of the magnetic sensing elements in the first half and subtracting the summation signal of the magnetic sensing elements in the second half of the area; ii. turning a separation axis by 360°/(2*n) clockwise or counter clockwise depending on the result of i., wherein n represents the number of the iterative steps performed for a target resolution, starting with n=2, and adding and subtracting the signal values of the new half-areas accordingly in response to a virtual turning; iii. repeating step ii. with increasing n until an amplitude of a remaining misalignment falls below a threshold value that is a function of the number of used magnetic sensing elements, the remaining misalignment being associated with a corresponding difference of the summation signals of the two half-areas, each iterative step reduces the angular distance of tracking; and iv. performing an A/D conversion on the remaining misalignment.