Mechanisms for detecting tampering of an electronic device
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United States of America Patent
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May 27, 2014
Grant Date -
Apr 4, 2013
app pub date -
Aug 31, 2012
filing date -
Aug 10, 2009
priority date (Note) -
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Abstract
An electronic device has a chassis, and a printed wiring board (PWB) having a hole. A fastener is installed in the hole thereby securing the PWB to the chassis. A pair of conductive traces is formed in the PWB. A cap, being an amount of conductive glue, covers a part of the fastener and fills an electrically insulating gap between the two traces, to thereby form a conductive path that connects the two traces. A sensing circuit is coupled to the traces, to detect a change in impedance of the path and signal a tamper event alert. Other embodiments are also described and claimed.
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