Autonomous, multi-channel USB data acquisition transducers
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United States of America Patent
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Sep 16, 2014
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N/A
app pub date -
Jun 27, 2013
filing date -
Jun 27, 2013
priority date (Note) -
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Abstract
A circuit and method of analog data acquisition synchronization from an analog sensor in multiple channels associated with a USB hub. An analog to digital converter connected to the sensor that is part of a USB device has a time and phase corrected sampling clock that is referenced to a start-of-frame traffic signal with a preconfigured message indicating a time offset or delay seen upstream through a USB port. A plurality of similar devices are autonomously synchronized by the same message for multi-channel data acquisition by a locally generated trigger signal that allows a preset amount of delay set by the message. An accelerometer is a preferred sensor for such multi-channel data acquisition.
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