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:
Jan. 05, 2016
Filed:
Jan. 26, 2012
Randall Wetzel, Scarborough, ME (US);
Kenneth P. Snowdon, Falmouth, ME (US);
Kenneth O'brien, Gorham, ME (US);
Randall Wetzel, Scarborough, ME (US);
Kenneth P. Snowdon, Falmouth, ME (US);
Kenneth O'Brien, Gorham, ME (US);
FAIRCHILD SEMICONDUCTOR CORPORATION, San Jose, CA (US);
Abstract
An apparatus comprises a connector configured to receive an electrical contact of an accessory device that is electrically coupled to a resistor of the accessory device, a current source configured to apply a specified current to the resistor to generate a resulting voltage, a comparator configured to receive and compare the resulting voltage to a reference voltage, and a controller configured to store an outcome of the comparison as a bit in a register, to adjust the applied current using the outcome of the comparison, and to determine a resistance value for the resistor using the bit stored in the register.