Sandisk Corporation

Quantum Corporation

Sandisk Technologies Inc.

Vincent Anthony Condito

Po-Shen Lai

Joel N Harrison

Ekram Bhuiyan

Steve Chi

Yongliang Wang

Randolph H Graham

Daniel P Nguyen

Brian J Nixon

Richard C Simonsen

Ekram Hossain Bhuiyan

Steve X Chi

A method for operating an electronic product having an application specific semiconductor circuit (ASIC) including in its circuitry both a linear regulator module for use with an optional external capacitance and a capless regulator module coupled to internal capacitance of the product selects a low-power sub-module or high-power sub-module of the capless regulator module for use in a power-up phase of the ASIC. Control logic of the ASIC determines if an external capacitance is present. If so, then the high-power capless sub-module is used during a power-up phase of the ASIC; if not only the low-power capless sub-module is used during the power-up phase of the ASIC. After power-up of the ASIC, the control logic may select the linear regulator module for certain times of operation and the capless regulator module for other times of operation or it may select one or the other for all times of post-power-up operation.

Self-configurable multi-regulator ASIC core power delivery

A disk drive storage device employs two control subsystems, one for transducer position digital control and the other to control and precisely regulate spindle motor angular velocity in accordance with a crystal reference and a speed correction made at least once each revolution. A single servo sector on a data surface provides prerecorded track centering information. Overall electromechanical operations during track following activities are synchronized by the crystal controlled disk spindle motor subsystem which locates the position in time and space of the servo sector and which also interrupts program execution of the transducer position digital control subsystem and causes it to execute a subroutine for track centerline position correction. Direct digital commutation of the brushless DC spindle motor by a programmed digital microprocessor is an aspect of the present invention.

Disk drive having two interactive electromechanical control subsystems

Growing community of inventors

San Jose, CA, United States of America

Vincent Anthony Condito