This is a long and thoughtful piece from someone who worked with McCarthy.
http://www.abnormaldistribution.org/2011/11/11/john-mccarthy/
November 12, 2011
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Simplifying Position Control with Advanced Stepper Motor Driver
Sponsored by Mouser Electronics and STMicroelectronics
In this episode of Chalk Talk, Jiri Keprda from STMicroelectronics and Amelia Dalton explore the benefits of the powerSTEP01 is a system-in-package from STMicroelectronics. They also examine how this solution can streamline overall position control architecture, the high level commands included in this solution and the variety of advanced diagnostics included in the powerSTEP01 system-in-package.