Shared interface device
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United States of America Patent
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Aug 24, 2004
Grant Date -
Apr 24, 2003
app pub date -
Oct 23, 2001
filing date -
Oct 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shared interface device provides connection between a portable electronic device and a peripheral unit. The shared interface device comprises a switch and an energy-storing element. The switch has a terminal connected to a T.times.D/POWER pin of the portable electronic device and an R.times.D pin of the peripheral unit, and another terminal connected to a VCC pin of the peripheral unit. The switch is ON/OFF when the T.times.D/POWER pin of the portable electronic device is HI/LO. The energy-storing element has one end connected to another end of the switch to supply electrical power to the peripheral unit and another end connected to ground. The energy-storing element is charged when the switch is ON and used as a backup power supply when the switch is OFF.
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