Means for saving electrical power
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Jul 16, 1998
filing date -
Jul 16, 1998
priority date (Note) -
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Abstract
Disclosed is a system for saving electrical power (II) comprising an external device, a control unit and a sensing device which is a directive switch and can sense the variation of angle. One end of the sensing device is connected to ground, another end of the sensing device is connected to the input of the control unit. The microcontroller will be switched to a power down mode from normal operation if the external device is not being accessed for a specific duration. Therefore, the PSEN pin of the microcontroller will be switched from a logical high state to a logical low state. At this time, the microcontroller will be triggered to recover the normal operation of external device if the sensing device senses angle change, thus reducing electrical power and prolonging the battery life.
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