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:
May. 30, 2006
Filed:
Jul. 16, 2003
Gregory Emil Swize, Dallas, TX (US);
Gregory Emil Swize, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A retract circuit () for retracting a data transducer carriage assembly () of a mass data storage device () to a retracted position has a digital state machine () that is user programmable to operate in a selected retract mode. An analog control circuit () is provided for receiving control signals from the digital state machine () for providing analog retract signals to move the data transducer carriage assembly (). The digital state machine () is user programmable to operate in constant voltage, velocity detect, float and pulse, and crash stop detect modes. Preferably, the digital state machine () is programmed to detect a velocity of the data transducer carriage assembly (). The digital state machine () also is preferably programmed to detect an error velocity of the data transducer carriage assembly () from a difference of a measured voltage across the data transducer driver () from a predetermined voltage.