Abnormal circuit operation detection system
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United States of America Patent
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Sep 14, 2010
Issued Date -
N/A
app pub date -
Aug 22, 2005
filing date -
Mar 29, 2005
priority date (Note) -
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Abstract
An abnormality in operation is detected by meticulously monitoring the operation of a monitored device that comprises a state machine. The state number, indicating the state the monitored device is currently in, is output from the device. The upper and lower limit values of current consumption is set for each state number. A monitoring circuit, using the upper and lower limit values for the present state number, judges the value of current consumption detected by a current detection circuit and detects whether there is abnormality in operation.
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