An implantable medical device that includes a magnetic sensor circuit that senses the presence of an external magnetic field and provides a signal that is proportionate to the strength of the magnetic field. The implantable medical device uses the variable signal to determine whether a magnetic field is being applied that is selected to activate a preselected function. In one implementation, the preselected function is a power up sequence.

 
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< Multi-port memory device having serial I/O interface

< High-resolution magnetoencephalography system and method

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> X-ray fluorescence system with apertured mask for analyzing patterned surfaces

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