Patent Number: 7,612,690

Title: Method and apparatus for scanning a key or button matrix

Abstract: An improved key matrix scanning technique conducts a first pre-scan on a first array of connections in a key matrix to identify any activated keys or buttons associated with the first array. A second sub-scan is conducted on a second array of connections in the key matrix but only for the connections in the first array that are detected as having activated keys.

Inventors: Wright; David G. (Escondido, CA), Asbury; Ray (Eagle, ID)

Assignee: Cypress Semiconductor Corporation

International Classification: H03M 11/00 (20060101)

Expiration Date: 1/03/02017