Apparatus using serial data line to turn on a transceiver or other device
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United States of America Patent
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Dec 20, 1994
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N/A
app pub date -
Nov 13, 1992
filing date -
Nov 13, 1992
priority date (Note) -
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Abstract
An apparatus and a method for using a serial data line to turn on an electrical device are disclosed. Energy is extracted from a data signal on an asynchronous serial data line using a charge pump. The extracted energy is used by a power supply switching circuit to turn power on. Once turned on, power is kept on by a keepalive circuit. A shutdown signal causes the power to be turned off.
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