Apparatus for drawing and processing electrical power from a communications line
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United States of America Patent
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-
Mar 4, 1997
Grant Date -
N/A
app pub date -
May 31, 1994
filing date -
Apr 13, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus powered from a communications line minimizes current drawn from the line by use of a variable power supply having a DC to DC conversion circuit controlled by an oscillator. The output of the DC to DC conversion circuit in a first lower power drawing mode is used to power a tone detection circuit which monitors the line for a wake-up tone. On receipt of an appropriate wake-up tone, the tone detection circuit provides an interrupt signal to a microprocessor which, in response, causes an increase in the oscillator frequency. The increased oscillator frequency then increases power drawn from the line via the DC to DC conversion circuit for operation in a second higher power drawing mode.
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