The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
May. 31, 2014
Apple Inc., Cupertino, CA (US);
Richard H. Tsai, Cupertino, CA (US);
Albert A. Ho, Mountain View, CA (US);
Thomas M. Gregory, Cupertino, CA (US);
Richard J. Topliss, Campbell, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
In some embodiments, a plurality of expected values of a drive current corresponding to respective ones of a plurality of potential values of a Hall sensor output is determined. An actual value of the Hall sensor output is measured. An actual value of the drive current is measured. A potential value of the Hall sensor output corresponding to the actual value of the Hall sensor output is selected. The expected value of the drive current associated with the selected potential value of the Hall sensor output is compared to the actual value of the drive current. A value of the drive current is adjusted to reduce a difference between the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current.