Micron Technology Incorporated

Hewlett-packard Company

Todd Hayden

Jay D Reeves

Lyle D Kraft

Power sources, backup power circuits, power source control circuits, data storage devices, and methods relating to controlling application of power to a node are disclosed. An example power source includes an input, backup power source, and a backup power source control circuit. The input is configured to be coupled to a primary power source and further configured to couple the primary power source to the output when the input is coupled to the primary power source. The backup power source control circuit is configured to control a current path from the backup power source to the output based at least in part on a voltage applied to the input.

Power source and power source control circuit

A system includes multiple modules, each powered by a different power source, and a status indicator for a first of the modules. Any of the multiple modules can drive the status indicator. Each of the modules monitors the operation of the first module, driving the status indicator when the first module fails. Thus, even if a failure within the first module prevents the first module from driving the status indicator (e.g., a power failure), the status indicator is still driven by a second module.

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Boise, ID, United States of America

Todd Hayden